Author Topic: Climate change mitigation strategies  (Read 16457 times)

RetiredAt63

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Re: Climate change mitigation strategies
« Reply #50 on: October 07, 2021, 10:35:36 AM »
One carbon source that doesn't get talked about a lot is the production of cement.  Not only does the limestone have to be heated to high temperatures, which obviously needs fuel, but the limestone itself gives off CO2 in the process.


maizefolk

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Re: Climate change mitigation strategies
« Reply #51 on: October 07, 2021, 11:49:04 AM »
Yeah, nationwide last year wind was 44% of newly installed electrical generating capacity nationwide and solar was another 32%. So that's about 3/4ths of the total from just the two biggest renewable technologies.

At this point each year about 60% of electrical power is still come from fossil fuels, with the balance from renewables and nuclear. It's not where we want to be. But it's also not the "nobody is willing to do anything and nothing is going to change" world it can be all too easy to imagine we live in.

What is your source on that? It's a crazy number for sure.

I too have been flirting with solar, I just need some help getting my neighbor to cut down a dying tree. Anyone know how to cut a tree down at night and keep a secret?

Sure thing, here's the estimate for 2020 which I was looking at. https://www.eia.gov/todayinenergy/detail.php?id=42495

GuitarStv also posted a link to the estimate for 2021 (76% wind/solar in 2020 vs 70% in 2021).

It may look like the 2021 numbers for renewable are lower than 2020, but in 2021 the EIA is including 4.3 gigawatts of grid-scale battery installations as part of their new generating capacity (11% of their total estimate for new capacity). It doesn't make sense to me that batteries count as electrical generating capacity, but if you count them, that's be 81% of new electrical generating capacity from renewable sources. If you take the batteries out of the equation entirely, we're looking at 79% wind+solar in 2021.

Well that is pretty cool, feels like we are actually closer to this whole net zero thing then I figured. I mean we might be about 15 years too late, but I feel that is something to be celebrated.

That is my view as well. We're not going to stave off climate change entirely. In all likelihood, it's going to get quite bad. But we're also making big changes that mean the future will be a lot LESS BAD than it otherwise was going to be. Changes I never expected our civilization to be willing or able to make even ten years ago.

If you don't take the time to celebrate the wins and good news, it can be easy to fall into to trap of feeling like there is no point in even trying.

GuitarStv

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Re: Climate change mitigation strategies
« Reply #52 on: October 07, 2021, 01:03:55 PM »
Yeah, nationwide last year wind was 44% of newly installed electrical generating capacity nationwide and solar was another 32%. So that's about 3/4ths of the total from just the two biggest renewable technologies.

At this point each year about 60% of electrical power is still come from fossil fuels, with the balance from renewables and nuclear. It's not where we want to be. But it's also not the "nobody is willing to do anything and nothing is going to change" world it can be all too easy to imagine we live in.

What is your source on that? It's a crazy number for sure.

I too have been flirting with solar, I just need some help getting my neighbor to cut down a dying tree. Anyone know how to cut a tree down at night and keep a secret?

Sure thing, here's the estimate for 2020 which I was looking at. https://www.eia.gov/todayinenergy/detail.php?id=42495

GuitarStv also posted a link to the estimate for 2021 (76% wind/solar in 2020 vs 70% in 2021).

It may look like the 2021 numbers for renewable are lower than 2020, but in 2021 the EIA is including 4.3 gigawatts of grid-scale battery installations as part of their new generating capacity (11% of their total estimate for new capacity). It doesn't make sense to me that batteries count as electrical generating capacity, but if you count them, that's be 81% of new electrical generating capacity from renewable sources. If you take the batteries out of the equation entirely, we're looking at 79% wind+solar in 2021.

Well that is pretty cool, feels like we are actually closer to this whole net zero thing then I figured. I mean we might be about 15 years too late, but I feel that is something to be celebrated.

That is my view as well. We're not going to stave off climate change entirely. In all likelihood, it's going to get quite bad. But we're also making big changes that mean the future will be a lot LESS BAD than it otherwise was going to be. Changes I never expected our civilization to be willing or able to make even ten years ago.

If you don't take the time to celebrate the wins and good news, it can be easy to fall into to trap of feeling like there is no point in even trying.


The 56% nuclear being replaced is also clean energy though, isn't it?  Doesn't that means that there's a real positive increase of about 14% in clean energy sources from wind and solar expected this year, once you account for the clean nuclear energy that is being decommissioned?  (I too don't count batteries as energy generation.)

It is good that the 30% coal is going away at least.

kite

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Re: Climate change mitigation strategies
« Reply #53 on: October 07, 2021, 01:51:47 PM »
In Texas there are no natural gas facilities in the works for interconnection in the next two years, all of that has been slated for solar and wind. This is a very NG-friendly state, but the market is not there for peaker plants, and the decrease in need has allowed what plants there are to cover variability. I’m not as familiar with other states’ plans but do know that the large majority of new builds are solar and wind, not an even 1:1 split as you imply. The EIA website shows that in their latest reports.

Yeah, nationwide last year wind was 44% of newly installed electrical generating capacity nationwide and solar was another 32%. So that's about 3/4ths of the total from just the two biggest renewable technologies.

At this point each year about 60% of electrical power is still come from fossil fuels, with the balance from renewables and nuclear. It's not where we want to be. But it's also not the "nobody is willing to do anything and nothing is going to change" world it can be all too easy to imagine we live in.

What is your source on that? It's a crazy number for sure.

I too have been flirting with solar, I just need some help getting my neighbor to cut down a dying tree. Anyone know how to cut a tree down at night and keep a secret?



If the tree is posing any risk to your property, you can request him to remove it by talking about insurance liability.  If it falls and damages your property, his insurance will have to pay for it, driving up his premium. Also, if it overhangs your property, you can cut off that portion of the tree.  Otherwise, a strap and winch are quieter than a chainsaw :-)  Wait for a good wind and blame it on that.

Where I live, the property the tree came from isn't the relevant bit. No matter whose tree falls on my house, car, fence etc...  it's my insurance on my own property that covers the loss. 


gaja

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Re: Climate change mitigation strategies
« Reply #54 on: October 07, 2021, 02:31:34 PM »
One carbon source that doesn't get talked about a lot is the production of cement.  Not only does the limestone have to be heated to high temperatures, which obviously needs fuel, but the limestone itself gives off CO2 in the process.

It is a hot topic in Norway, with two proposed mitigation actions:
a) use more wood for buildings: https://www.theexplorer.no/stories/architecture-and-construction/norway-is-home-to-the-worlds-tallest-timber-building/
b) CCS: https://www.heidelbergcement.com/en/carbon-capture-and-storage-ccs

maizefolk

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Re: Climate change mitigation strategies
« Reply #55 on: October 07, 2021, 05:34:11 PM »
Sure thing, here's the estimate for 2020 which I was looking at. https://www.eia.gov/todayinenergy/detail.php?id=42495

GuitarStv also posted a link to the estimate for 2021 (76% wind/solar in 2020 vs 70% in 2021).

It may look like the 2021 numbers for renewable are lower than 2020, but in 2021 the EIA is including 4.3 gigawatts of grid-scale battery installations as part of their new generating capacity (11% of their total estimate for new capacity). It doesn't make sense to me that batteries count as electrical generating capacity, but if you count them, that's be 81% of new electrical generating capacity from renewable sources. If you take the batteries out of the equation entirely, we're looking at 79% wind+solar in 2021.

Well that is pretty cool, feels like we are actually closer to this whole net zero thing then I figured. I mean we might be about 15 years too late, but I feel that is something to be celebrated.

That is my view as well. We're not going to stave off climate change entirely. In all likelihood, it's going to get quite bad. But we're also making big changes that mean the future will be a lot LESS BAD than it otherwise was going to be. Changes I never expected our civilization to be willing or able to make even ten years ago.

If you don't take the time to celebrate the wins and good news, it can be easy to fall into to trap of feeling like there is no point in even trying.

The 56% nuclear being replaced is also clean energy though, isn't it?  Doesn't that means that there's a real positive increase of about 14% in clean energy sources from wind and solar expected this year, once you account for the clean nuclear energy that is being decommissioned?  (I too don't count batteries as energy generation.)

It is good that the 30% coal is going away at least.

I don't think it is correct to look at the percentages that way because we're building more capacity than we're retiring.

In 2021 only 9.1 gigawatts of generating capacity is being retired and 39.7 gigawatts is coming online.

If 56% of 9.1 is nuclear, that's a loss of 5 gigawatts of non-fossil fuel generating capacity.

If ~80% of the new power is wind + solar that's 32 gigawatts of new non-fossil fuel generating capacity (not counting the 1.1 gigawatts of NEW nuclear coming online to replace some of the decommissioned capacity) which otherwise would have had to have been met with either coal or natural gas plants.

StashingAway

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Re: Climate change mitigation strategies
« Reply #56 on: October 07, 2021, 06:42:11 PM »
Sure thing, here's the estimate for 2020 which I was looking at. https://www.eia.gov/todayinenergy/detail.php?id=42495

GuitarStv also posted a link to the estimate for 2021 (76% wind/solar in 2020 vs 70% in 2021).

It may look like the 2021 numbers for renewable are lower than 2020, but in 2021 the EIA is including 4.3 gigawatts of grid-scale battery installations as part of their new generating capacity (11% of their total estimate for new capacity). It doesn't make sense to me that batteries count as electrical generating capacity, but if you count them, that's be 81% of new electrical generating capacity from renewable sources. If you take the batteries out of the equation entirely, we're looking at 79% wind+solar in 2021.

Well that is pretty cool, feels like we are actually closer to this whole net zero thing then I figured. I mean we might be about 15 years too late, but I feel that is something to be celebrated.

That is my view as well. We're not going to stave off climate change entirely. In all likelihood, it's going to get quite bad. But we're also making big changes that mean the future will be a lot LESS BAD than it otherwise was going to be. Changes I never expected our civilization to be willing or able to make even ten years ago.

If you don't take the time to celebrate the wins and good news, it can be easy to fall into to trap of feeling like there is no point in even trying.

The 56% nuclear being replaced is also clean energy though, isn't it?  Doesn't that means that there's a real positive increase of about 14% in clean energy sources from wind and solar expected this year, once you account for the clean nuclear energy that is being decommissioned?  (I too don't count batteries as energy generation.)

It is good that the 30% coal is going away at least.

I don't think it is correct to look at the percentages that way because we're building more capacity than we're retiring.

In 2021 only 9.1 gigawatts of generating capacity is being retired and 39.7 gigawatts is coming online.

If 56% of 9.1 is nuclear, that's a loss of 5 gigawatts of non-fossil fuel generating capacity.

If ~80% of the new power is wind + solar that's 32 gigawatts of new non-fossil fuel generating capacity (not counting the 1.1 gigawatts of NEW nuclear coming online to replace some of the decommissioned capacity) which otherwise would have had to have been met with either coal or natural gas plants.

In that scenario, we are loosing baseload capacity and replacing it with intermittent generation. "capacity" of generation of wind power doesn't equal "production" of said power. A 1GW wind farm may be producing zero power during a still day- not great when you need that power to keep the grid from crashing.

The ONLY reason we are able to build so much solar and wind capacity is because of all of the fast ramping gas plants we've been building. Those plants take over when the sun isn't shining and wind isn't blowing. And they have to be able to run the entire grid in those scenarios (along with coal, nuclear and sometimes hydro) Our energy production sector is producing less CO2 per MW, and the real hero is the gas plants. Bot for being much cleaner than coal plants as well as being able to quickly come online to take over intermittent renewables. Solar and Wind are now a noticeable (but still small) chunk of our power these days, but would not work without the gas plants.

California keeps having rolling blackouts because the dams are drying up and they retired too many of their nuclear plants and didn't have replacements... they're now building gas plants to remedy it. They've yet to build substantial batteries for backup power (the batteries currently on the grid are for short term price arbitrage as well as frequency mitigation).

Renewables are in the news, but the grid won't work with them. The best answer is nuclear, but public opinion on that is all but hopeless.
« Last Edit: October 07, 2021, 06:44:52 PM by StashingAway »

Abe

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Re: Climate change mitigation strategies
« Reply #57 on: October 07, 2021, 09:37:25 PM »
California had 9 power outages from 1/1/-6/30 of this year totaling 80 hours
Texas had 9 outages also, totaling 154 hours (ignoring the Great Freeze since that was a fluke event).

These two states accounted for the majority of power outages in the US.

California gets 56% of its power from nuclear, coal and natural gas
Texas gets 78% of its power from nuclear, coal, and natural gas
En face it seems
1) power outages are uncommon events i
2) these sources are insufficient to avoid outages
3) grid stability by spreading out sources geographically is beneficial (cough cough Texas Great Freeze cough cough)

Also based on these graphs, natural gas capacity and generation in California has gone down slightly over time: https://www.energy.ca.gov/data-reports/energy-almanac/california-electricity-data/electric-generation-capacity-and-energy

Also natural gas imports from other states have also gone down from 12 TWh to 8.7 Twh

https://www.energy.ca.gov/data-reports/energy-almanac/california-electricity-data/2019-total-system-electric-generation/2015

https://www.energy.ca.gov/data-reports/energy-almanac/california-electricity-data/2020-total-system-electric-generation

I’m not sure where the figures for increased natural gas are coming from…
« Last Edit: October 07, 2021, 10:19:08 PM by Abe »

Jon Bon

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Re: Climate change mitigation strategies
« Reply #58 on: October 08, 2021, 06:43:02 AM »
California had 9 power outages from 1/1/-6/30 of this year totaling 80 hours
Texas had 9 outages also, totaling 154 hours (ignoring the Great Freeze since that was a fluke event).

These two states accounted for the majority of power outages in the US.

California gets 56% of its power from nuclear, coal and natural gas
Texas gets 78% of its power from nuclear, coal, and natural gas
En face it seems
1) power outages are uncommon events i
2) these sources are insufficient to avoid outages
3) grid stability by spreading out sources geographically is beneficial (cough cough Texas Great Freeze cough cough)

Also based on these graphs, natural gas capacity and generation in California has gone down slightly over time: https://www.energy.ca.gov/data-reports/energy-almanac/california-electricity-data/electric-generation-capacity-and-energy

Also natural gas imports from other states have also gone down from 12 TWh to 8.7 Twh

https://www.energy.ca.gov/data-reports/energy-almanac/california-electricity-data/2019-total-system-electric-generation/2015

https://www.energy.ca.gov/data-reports/energy-almanac/california-electricity-data/2020-total-system-electric-generation

I’m not sure where the figures for increased natural gas are coming from…

I think it is part of a long term world wide trend to move from coal/oil to natural gas. Which is a good thing!

From the WSJ

"The recent shortages (of CNG) are complicating the way nations are managing the switch to less carbon-intensive sources of electricity, such as wind and solar power. Plentiful gas gave governments and companies confidence to press ahead with developing the renewables—because in a pinch power systems could always fall back on cheap gas, which emits around half as much carbon as coal."

Per the outages I don't think they have much/anything to do with the current energy mix. CNG plans would be "peakers" so they would only run during the levels of highest demand.

I think our current trajectory of building lots of renewable and CNG plants to manage demand is the right one. Nuclear would be better, but people lose their minds over it.  But I am just one guy on the internet.







maizefolk

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Re: Climate change mitigation strategies
« Reply #59 on: October 08, 2021, 07:44:14 AM »
Yeah, if someone can point me towards the right people to vote for to implement more nuclear (preferably modular and hence easier and cheaper to build in large numbers nuclear) I'd be happy to do so.

But adding ever increasing numbers of cheaper-than-coal wind and solar to the grid definitely still seems like good news, particularly now that we're starting to see gigawatt scale battery storage come online to start supplementing natural gas powered peaker plants.

StashingAway

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Re: Climate change mitigation strategies
« Reply #60 on: October 08, 2021, 07:53:12 AM »
But adding ever increasing numbers of cheaper-than-coal wind and solar to the grid definitely still seems like good news, particularly now that we're starting to see gigawatt scale battery storage come online to start supplementing natural gas powered peaker plants.

The batteries won't help at the scale that they're at. They are orders of magnitude too small to do anything but price arbitrage and frequency mitigation (and we don't have enough lithium to make *really* big ones).

But I agree, CNG + renewables is a great start.

ChpBstrd

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Re: Climate change mitigation strategies
« Reply #61 on: October 08, 2021, 08:13:37 AM »
Nuclear would be better, but people lose their minds over it.  But I am just one guy on the internet.
Unfortunately for nuclear,
1) Nobody is willing to accept a long-term waste storage facility in their state, and
2) When no corners are cut, nuclear is much more expensive than the alternatives. When corners are cut, we end up with disasters that cost many times even that overpriced amount.

Although perhaps in a few decades, we will regret not paying these dues in the 20th and early 21st centuries, because the cost of climate change is going to dwarf everything.

maizefolk

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Re: Climate change mitigation strategies
« Reply #62 on: October 08, 2021, 08:52:38 AM »
But adding ever increasing numbers of cheaper-than-coal wind and solar to the grid definitely still seems like good news, particularly now that we're starting to see gigawatt scale battery storage come online to start supplementing natural gas powered peaker plants.

The batteries won't help at the scale that they're at. They are orders of magnitude too small to do anything but price arbitrage and frequency mitigation (and we don't have enough lithium to make *really* big ones).

But I agree, CNG + renewables is a great start.

Talking about peaker plants specifically, their whole role essentially IS price arbitrage and frequency mitigation (or to put it another way, ensuring grid stability). Many of these plants operate with capacity factors on the order of 1-5% and typically come online for a few hours at a time.

That's a very different use case than conventional natural gas plants, and one where batteries are already pulling ahead.
« Last Edit: October 08, 2021, 12:46:12 PM by maizefolk »

Cranky

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Re: Climate change mitigation strategies
« Reply #63 on: October 08, 2021, 12:36:24 PM »
In the short run -

We’re currently setting up new raised beds and garden plots so that we can expand our hyper local food system.

We buy most of our clothes at the thrift store.

We’re trying to cut back on plastic - I feel like moving generated an awful lot of packaging. I gave away all of my boxes on Buy Nothing, but it’s time to lower the boom on what goes into the recycling bin.

In the long run - when we replace the roof we’ll put in solar panels. And next year I’m buying an ebike because this is a pretty bike friendly area.

Just Joe

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Re: Climate change mitigation strategies
« Reply #64 on: October 08, 2021, 02:44:36 PM »
I too have been flirting with solar, I just need some help getting my neighbor to cut down a dying tree. Anyone know how to cut a tree down at night and keep a secret?

Pet termites. You have to be patient though... No idea how to collect them when they are done.

Re: large scale batteries. Build more pumped hydro storage.

Re: preppers. I don't see things going Mad Max overnight but I would expect climate change to lead to COVID type price increases and shortages. Slow restocking.

We feel that being more self-sufficient is important - food, repairs, cash, security, etc. A problem with this strategy is it would be hard to walk away from our home if we were forced out by social unrest on short notice. If the economy or government was damaged, insurance may not be reliable anymore.

I'd like to see less plastic used and more efforts to actually recycle and repurpose this material. I suppose if the bales were buried they could be recovered later to be processed.
« Last Edit: October 08, 2021, 02:53:28 PM by Just Joe »

gaja

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Re: Climate change mitigation strategies
« Reply #65 on: October 08, 2021, 04:24:46 PM »
It is interesting how the focus always is on electricity, not on the other parts of the energy system. Other energy carriers are often more than 50 % of the energy system, and within transport, industry and heating, it can be much more. Since heating and cooling needs often cause very high peaks, switching more of this to district heating/cooling systems can help diminish both the base loads and peak loads. And since heat often is a byproduct from industry, or can be recycled from buildings or sewage, reclaiming it can give you more usable energy without increasing production substantially.

Energy efficiency measures are also much more important than the attention they get. Included in this is not only buildings, but also switching from road and air transport to rail and sea, or from ICE engines to electric.


For the personal side: we just bought a homestead which is located 100 m above sea level, not prone to flooding, close enough to the coast to avoid the worst heat waves, and far enough into the fjords to be protected from the worst storms and hurricanes. We might grow something and raise some animals for the fun of it, and to take care of the landscape. I'm also looking into open pollinated heritage seeds, and testing growing new fruits, nuts and vegetables that might thrive in a warmer and wetter climate. Sure, we might buy a gun or two for hunting, and for slaughtering our own animals. But I have no fear about public unrest or stuff like that. I have no illusions that we will be able to make a living as farmers. This is an area where people have always looked for income to supplement the farming, either from shipbuilding, fishing, tourism, or travelling away to work in the winter time. So there are no unrealistic dreams, I just like living in the country side and growing stuff. We are only 15 minutes from the closest doctor's office, 1 hour from a medical center, and 2.5 hours from a good hospital (or much shorter by helicopter). The bad statistics regarding rural poverty, education, and drugs, must be a US thing. Statistically, we have much more poverty and socio economic issues in urban than in rural areas. Sure, there are less kids here getting higher academic educations, but that is not where the money is today. They are becoming electricians, plumbers, builders, etc., and start making good money from the age of 16. In 2019, the unemployment in this area was 4 people (or .7 %).

Abe

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Re: Climate change mitigation strategies
« Reply #66 on: October 09, 2021, 08:37:10 PM »
Tackling Electricity for non-industrial purposes is the low-hanging fruit (at least in the US). Next is transport, especially electrifying cars and intra-city delivery vehicles. 70% of all energy used in the US is for transport, electricity and non-industrial heating.

converting to 100% renewable sources for the non-industrial power grid would drop fossil fuel use by about 30%.  These changes are technically possible and relatively cheap (but logistically difficult). The advantages are that large-scale solar and wind are quite cheap (batteries are not there yet) and there’s no major remodeling needed by consumers (electrons coming in are electrons regardless of origin).

Switching car and truck transport to electricity would reduce consumption by another 30%.  However, major stumbling blocks include the cost of batteries for mobile objects (cars, trucks, ships, etc).

Regarding rail: short-distance rail in the US is mostly electric. Long-distance rail in the US is a non-starter for multiple reasons. Both are rarely used outside of densely populated cities in the northeast and north west coasts. Reconfiguring other cities to use rail is a logistical nightmare that would take decades. Thus the focus on electrification of what we use rather than socially engineering our society to fit a dense urban mold.   

Switching commercial and residential heating to electricity would reduce fossil fuel consumption by only 10%. This would require a major revamp of building systems and be relatively expensive due to remodeling labor costs.
« Last Edit: October 09, 2021, 08:44:31 PM by Abe »

maizefolk

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Re: Climate change mitigation strategies
« Reply #67 on: October 09, 2021, 08:49:17 PM »
Switching commercial and residential heating to electricity would reduce fossil fuel consumption by only 10%. This would require a major revamp of building systems and be relatively expensive due to remodeling labor costs.

One thing we could be doing very easily and aren't yet is creating strong financial incentives (or code requirements) for the use of heat pumps instead of or as a supplement to furnaces on new construction. Heat pumps are a double win in that they switch the energy source for heating from natural gas to electricity (which in principle could be coming from renewable sources) and also can produce substantially more heating from the same amount of energy.

GuitarStv

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Re: Climate change mitigation strategies
« Reply #68 on: October 09, 2021, 10:16:20 PM »
The problem with transit in North America is how spread out populations are.

We could also end the incentives currently provided to people living in suburban and rural areas (charge more for mail, charge the true price of road maintenance, etc.).  This would naturally encourage more people to live in cities which would reduce fuel waste on travel while providing greater demand for public transit.

ChpBstrd

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Re: Climate change mitigation strategies
« Reply #69 on: October 10, 2021, 08:36:11 AM »
The problem with transit in North America is how spread out populations are.

We could also end the incentives currently provided to people living in suburban and rural areas (charge more for mail, charge the true price of road maintenance, etc.).  This would naturally encourage more people to live in cities which would reduce fuel waste on travel while providing greater demand for public transit.

+1.
A lot of people move to the exurbs because the real estate is slightly cheaper, but there's a road that somebody paid a couple million dollars for linking their house to the freeway. Likewise, there are millions of dollars of utilities, law enforcement, fire, mail, and ambulance service costs, road maintenance, etc. All paid by somebody so that 15 houses can be built along 15 miles of rural road instead of closer to town. Hopefully the rise of online retail and cutthroat delivery services will result in higher charges for remote locations. If history is any guide, rural legislators will pass a law to equalize pricing and force a subsidy on the city folk.

GuitarStv

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Re: Climate change mitigation strategies
« Reply #70 on: October 10, 2021, 10:15:30 AM »
The problem with transit in North America is how spread out populations are.

We could also end the incentives currently provided to people living in suburban and rural areas (charge more for mail, charge the true price of road maintenance, etc.).  This would naturally encourage more people to live in cities which would reduce fuel waste on travel while providing greater demand for public transit.

+1.
A lot of people move to the exurbs because the real estate is slightly cheaper, but there's a road that somebody paid a couple million dollars for linking their house to the freeway. Likewise, there are millions of dollars of utilities, law enforcement, fire, mail, and ambulance service costs, road maintenance, etc. All paid by somebody so that 15 houses can be built along 15 miles of rural road instead of closer to town. Hopefully the rise of online retail and cutthroat delivery services will result in higher charges for remote locations. If history is any guide, rural legislators will pass a law to equalize pricing and force a subsidy on the city folk.

It's not as clear cut as city vs rural.  Many in cities (myself included) live in suburbs . . . which aren't really much better than rural areas.  We need to stop building low density.  It's not a sustainable way to go in the future.

maizefolk

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Re: Climate change mitigation strategies
« Reply #71 on: October 10, 2021, 10:36:51 AM »
I agree densification would create significant benefits in terms of energy savings.

But at the same time when considering the tradeoffs between "political capital expended" vs "efficiency gains" I'd say trying to achieve that goal by raising the costs of transportation/mail delivery/road access isn't where it makes sense to start.

It's not as clear cut as city vs rural.  Many in cities (myself included) live in suburbs . . . which aren't really much better than rural areas.  We need to stop building low density.  It's not a sustainable way to go in the future.

Out of curiosity, is "urban vs rural" equally code for political affiliation in Canada the way it has become in the USA?

gaja

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Re: Climate change mitigation strategies
« Reply #72 on: October 10, 2021, 01:37:25 PM »
Tackling Electricity for non-industrial purposes is the low-hanging fruit (at least in the US). Next is transport, especially electrifying cars and intra-city delivery vehicles. 70% of all energy used in the US is for transport, electricity and non-industrial heating.

converting to 100% renewable sources for the non-industrial power grid would drop fossil fuel use by about 30%.  These changes are technically possible and relatively cheap (but logistically difficult). The advantages are that large-scale solar and wind are quite cheap (batteries are not there yet) and there’s no major remodeling needed by consumers (electrons coming in are electrons regardless of origin).

Switching car and truck transport to electricity would reduce consumption by another 30%.  However, major stumbling blocks include the cost of batteries for mobile objects (cars, trucks, ships, etc).

Regarding rail: short-distance rail in the US is mostly electric. Long-distance rail in the US is a non-starter for multiple reasons. Both are rarely used outside of densely populated cities in the northeast and north west coasts. Reconfiguring other cities to use rail is a logistical nightmare that would take decades. Thus the focus on electrification of what we use rather than socially engineering our society to fit a dense urban mold.   

Switching commercial and residential heating to electricity would reduce fossil fuel consumption by only 10%. This would require a major revamp of building systems and be relatively expensive due to remodeling labor costs.
Why would you switch to electric heating? Heat should come from low quality energy, such as reclaimed heat from industry and sewage, or bioenergy. There are a lot of energy sources that can be used to produce heat, but not electricity. Heat is also often a by product from electricity production, and using CHP will save us a lot of primary energy compared to using electricity for heating: https://www.youtube.com/watch?v=DtA2A_3f0Os

When I'm talking about rail and sea, I'm focusing on the transport of goods. Sure, trains and boats are good for people, too, but goods are the bulk items here that we need to shift transport mode on. People should be transported less, and rather transport themselves (via feet/bike) as much as possible. If western films are to be trusted, you do have a rail system going from coast to coast: is it really impossible to use to transport goods? The last mile will almost always be on rubber wheels, shifting containers to trains or boats for the long distances will make a large distance on fuel consumption. Also, the shorter distance trucks can already run on biogas or electricity with today's technology. It is the long distances where there are issues.

HSBW

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Re: Climate change mitigation strategies
« Reply #73 on: October 10, 2021, 05:19:06 PM »
I don’t see how combined heat and power is remotely feasible for the majority of houses in the US, especially in residential context. Sure, capture and use waste energy in industrial locations where it can be done cost effectively. Heat pumps are technologically ready today for residential application with the proper economic nudge.

Abe

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Re: Climate change mitigation strategies
« Reply #74 on: October 10, 2021, 06:13:48 PM »

Why would you switch to electric heating? Heat should come from low quality energy, such as reclaimed heat from industry and sewage, or bioenergy. There are a lot of energy sources that can be used to produce heat, but not electricity. Heat is also often a by product from electricity production, and using CHP will save us a lot of primary energy compared to using electricity for heating: https://www.youtube.com/watch?v=DtA2A_3f0Os

When I'm talking about rail and sea, I'm focusing on the transport of goods. Sure, trains and boats are good for people, too, but goods are the bulk items here that we need to shift transport mode on. People should be transported less, and rather transport themselves (via feet/bike) as much as possible. If western films are to be trusted, you do have a rail system going from coast to coast: is it really impossible to use to transport goods? The last mile will almost always be on rubber wheels, shifting containers to trains or boats for the long distances will make a large distance on fuel consumption. Also, the shorter distance trucks can already run on biogas or electricity with today's technology. It is the long distances where there are issues.

In the US most houses are some distance from major industrial and commercial centers, limiting its utility for this purpose. Heating of nearby commercial buildings is a practical option, though. Sewage heat reclamation seems more practical, especially in downtown cities.  Heat production is less of an issue for non-fossil fuel electricity sources so that should necessarily be less useful as we transition to renewables.

We use rail transport for goods extensively in the US. Unfortunately our patience for items to arrive has worn thin (for the worse, honestly), so there’s more trucking being done for “just-in-time” delivery. It’s a huge logistical nightmare and very wasteful.

NorCal

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Re: Climate change mitigation strategies
« Reply #75 on: October 10, 2021, 06:50:48 PM »
Interestingly, my city of Denver is in the process of approving a “net zero” permitting requirement. I’m oversimplifying it a bit, but effectively, new single family homes have to produce as much energy as they consume. The overall efficiency standards will be higher, and buildings will be all electric.

Commercial and multi family buildings will have similarly high efficiency standards, but solar production standards will be tied to a % of roof area.

Most surprising is that the developers aren’t really fighting it. They haven’t come out to support it either, but at least it’s not opposed.

The developers estimate total construction cost will increase by about 2%, and operating costs for energy will drop to near zero.  I’d be surprised if this doesn’t actually lower the TCO of new construction.

Getting new construction buildings close to net zero is pretty easy and cheap. It also doesn’t need much in the way of complicated heat capture systems (at least in CO climate).

Retrofitting older buildings is obviously much more expensive.

GuitarStv

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Re: Climate change mitigation strategies
« Reply #76 on: October 10, 2021, 07:28:38 PM »
Out of curiosity, is "urban vs rural" equally code for political affiliation in Canada the way it has become in the USA?


I can only really speak to Ontario on this.

Southern Ontario pretty clearly follows the rural/urban Conservative/Liberal split, but northern Ontario is almost entirely rural and often seems to go to the NDP . . . who are left of the Liberals.  (This might be due to the fact that poverty is a pretty big thing in Northern Ontario.)

Abe

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Re: Climate change mitigation strategies
« Reply #77 on: October 10, 2021, 07:33:09 PM »
Interestingly, my city of Denver is in the process of approving a “net zero” permitting requirement. I’m oversimplifying it a bit, but effectively, new single family homes have to produce as much energy as they consume. The overall efficiency standards will be higher, and buildings will be all electric.

Commercial and multi family buildings will have similarly high efficiency standards, but solar production standards will be tied to a % of roof area.

Most surprising is that the developers aren’t really fighting it. They haven’t come out to support it either, but at least it’s not opposed.

The developers estimate total construction cost will increase by about 2%, and operating costs for energy will drop to near zero.  I’d be surprised if this doesn’t actually lower the TCO of new construction.

Getting new construction buildings close to net zero is pretty easy and cheap. It also doesn’t need much in the way of complicated heat capture systems (at least in CO climate).

Retrofitting older buildings is obviously much more expensive.

Those are good points. Meeting a reasonable insulation standard for new construction is fairly easy. Just need more insulation and tighter caulking, etc.

I think the developers aren’t fighting it because they’re going to charge a 10-20% premium for new construction as “energy efficient luxury houses”. Hopefully some of that will trickle down.

I listened to a wonky energy podcast and they were discussing how the energy efficient of modern residential construction is quite high, and 70% more efficient than houses from the 70s-80s. However, commercial construction has gone the opposite way due to all the glass walls and excess air circulation. Now a new commercial building uses 4-5x more energy than a residential house!

Syonyk

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Re: Climate change mitigation strategies
« Reply #78 on: October 10, 2021, 10:04:43 PM »
I'm not sure why one would do better living an off-grid farm lifestyle during the era of climate change. A similar rate of change has been occurring for the past 30+ years and we aren't living in Mad Max land yet. Do you wish you had been living in isolation or subsistence farming during the last couple of decades because of the climate changes that have taken place? Not to diminish the reality and devastation of global warming, but by how much will the next 30y of change look different than the last 30y? A quarter-degree faster?

I'll take this as at least partly directed at me, since I'm obviously one of those who tends a bit more rural, and I certainly have a thing for off-grid energy systems...

You're making a bit of a uniformitarian style argument here - "Because the past has gone this way, so must go the future."  And I can gesture at the past two years of "Well, it might, or it might not."  You also seem to conflating "rural" with "off-grid" - and I'm not at all sure I agree.  But, if you want to really go with an off-grid lifestyle argument, I'm pretty sure the Amish have been doing fine.  And will be doing fine.  And will deal with whatever comes, quite flexibly.

In defense of a more rural lifestyle (I'm not off-grid, other than my office, which I very much consider an active R&D system):
- I have the space for what amounts to a good start for an off-grid power system.  My solar is ground mount, and very much an off-grid style system, even though it's grid tied.  Couldn't get through the red tape to an actual off-grid capable system, the local red tape named Jimmie was a problem there.  However, should SHTF, he can take a flying leap, and I can convert my system to off-grid fairly easily, with the power trailer I have.  My solar, plus a medium battery bank in the trailer (and a small generator), would keep the house livable, if not comfortable, year round, and keep my food cold, meals hot, and... I'm not going to say showers hot in the winter, but most of the year, they'd be an energy-affordable luxury.  I expect various "disruptions" to be more and more frequent, and while I'm grid tied, having some standalone capability is nice - and easier out in the country.  For a case study in this, see Europe if there's a particularly cold winter.  They're in for a rough time.
- I have the space for storage.  In addition to storage in the house, I have quite a few square feet of external storage, for things like lumber, supplies, food, etc.  Again, I'm not gambling on the total collapse of civilization, but on more disruptions, supply chain shortages, etc.  I can ride through more of those out here than I can in a city.
- I'm closer to food production.  I know it's super popular in the cities to just rail against the local food production and insist that you can import it from overseas, but I'll take my local food production resources and see you a disaster. :p
- I don't have to worry about neighbors bitching, moaning, and complaining about my various experiments on the property.  If I want to toss a big solar array on my office, I do it.  If I want to toss a big solar array on the house, I do it.  I'm a bit fuzzy as to exactly what the permits will be for a large greenhouse built of locally sourced rock and glass, but... I'll work it out, or build a few smaller ones with connections.  I'm mostly left alone to do that which I want to do, and cities, in my experience, are absolutely opposed to that.  I have a truck.  I use a truck.  I don't have to play stupid games like parking my truck worse, because some bored HOA housewife with nothing better to do decides that my truck doesn't move enough because I got good at parking it within an inch or two of the same spot each time (I started parking it over a 3-6' range, and the notices stopped).  It's plugged in, on a battery tender (block heater in the winter if I'm going to use it), and if it doesn't move for a couple weeks, well, no problem.

I like not living near people who have nothing better to do than bug me about what they think I'm doing that they wouldn't do.

If things stagger on as they've been doing up until a few years ago, well... I'm out in the country, where I like to live, near family, and I have some interesting experiments I can perform with solar, aquaponics, raised beds, etc.

If things go like they've been the past year or two, and supply chains are disrupted, energy shortages are a thing, food is a bit more scarce, and a dying empire continues to do the sort of idiotic things dying empires tend to do, well, I've got more options, and I've got more space to play with them.  I don't particularly want to try and have to feed my family from our acres, but I have the space to do it, and would like to have the experience to do it as well (all sorts of adaptations taking many years to get good at).

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There are risks involved with leaving behind a city where earning opportunities are more likely to be plentiful, and moving to a place where your access to income is limited,

Cities: Earn a lot of money.  Spend more of it on your housing rental (because you can't afford a place while saving up for a $200k down payment), and spend the rest on luxury services that replace doing anything yourself.  Unless you're earning a lot of money, I'm not convinced that the tradeoffs are worth it, having lived in a variety of places.  Rural, it's an awful lot easier to build/buy your place, pay it off, and have a very low set of fixed costs.  I don't quite know how hard we could clamp down spending out here (haven't had to try it, could if we had reason to), but our basic annual expenses are property tax (way less than a lot of people reading this pay), insurance (optional but recommended), and food.  Most of the rest is optional, and could get clamped down in a hurry if we had to.

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where you are 100% dependent upon the internet for your perspective about the world (shudders),

... versus a city, where you... sorry, what's your argument here? I get news from the radio (FM, thank you very much), magazines, a local newspaper, other people, the internet... quite a few sources, though I prefer the campfire conversations.

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where you have to learn a new career in agricultural science

Uh.  O... kay?  That straw man is sure getting beat to hell here.  I know a lot of people out here who don't do that, though we're rather smaller on the garden front than most other people I know.

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where your kids will have a hard time obtaining education or social skills, where healthcare services are hours away, and where you are at greater risk of water poisoning from your well, mosquito and tick borne illnesses, etc. In a world where you can't afford to travel to the city, what happens when your kid steps on a nail or gets bitten by a wild animal? This is part of why mortality is already higher in rural places.

Sorry.  The strawman you've built is suffering badly, but I'm entirely not familiar with what you're referring to here almost entirely.  I recognize I'm mountain west, not south, but I don't think these are requirements of rural life, if one doesn't care for them to be.

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1) be wealthy
2) stay healthy
3) be educated, and keep being educated
4) be connected to a community of people in real life, not the internet
5) be optimistic and have an abundance mindset

(1) Easier said than done over the long term.  This forum has literally never seen a bear market -- the domain was registered in 2011.  I am a pessimist by trade (I've done a lot of computer security), and I think it's going to be very interesting to see what happens when there's an actual market turn, or an effective one (as we're seeing now, if you look at actual inflation rates of the crap people buy, instead of listening to the "it's Transitory!" arguments based on few things people actually need).  I'm decently hedged against a variety of outcomes, but if we actually see a solid market crash, this place is going to be interesting.
(2) Agreed.
(3) Agreed.
(4) Agreed, and I'll offer that such things are rather easier in a rural area.
(5) That works, until such conditions don't exist, at which point it's not going to work well.  See (1).

If there isn't someone you can vote for in good conscience then you need to get involved.

I'm aware.  I intend to get a rather overly verbose and long form campaign website written before the next set of major elections, because I think it's entirely absurd that we've had some unopposed positions, but I don't exactly expect to win anything.

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Let's try an instance: are there solar panels on the roof of your local school? Your local town hall?  If not, why not?

No.  Don't know why.  I'm far enough out of town that I'm more or less ignored in the local town council, and can't actually fill any positions.

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Can you put a proposition together to be voted on, showing the spending/tax savings that would result?  You've already put in the work on this on a personal level, spreading it to every suitable public building in your municipality would be a bigger win than everything else you are doing.

I'm county, not city/town/etc.  Unfortunately, as a result of that, I don't have much say in the local stuff.  It's a bit annoying.

However, given the solar install companies out here wanting $4/W, and our power being very cheap, I can't make an actual case for solar.  Anything new isn't even guaranteed much net metering beyond "Well, uh... you get kWh for kWh until we get around to getting something else approved."  The last attempt was smacked down rather hard by the PUC, but no idea how long a kWh credit will last.  It's probably worth it, but my next few projects are various local people I know who can do the work themselves, and a church building that, hopefully, we can do a lot ourselves.  I'm not a licensed electrician, so I can only provide technical support for homeowners and such, not actually do work myself.  I've no particular interest in spending a decade of my 40s becoming such a thing either.

One thing I find interesting, and this thread sort of re-enforces it. There is literally no problem that Americans will not attempt to consume themselves out of.

Indeed.  You Must Buy Green!  As long as you're buying.  It's certainly a problem, and I'll glare awfully hard at the Tesla crowd here.

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It's not where your electricity comes from. It's that you use too much.

How's the European grid looking for the winter?  Hopefully it's not a cold winter, right?

The problem is partly the total use, and partly the time of use.  And I'll point at my own off-grid office system as an example.  On 85% of the days, I have more energy than I know what to do with.  I'm paneled for winter, which means that most of the year is pretty easy, and I blow off the surplus running BOINC compute tasks.  10%, it's marginal, but I have enough to do what I need.  The rest are energy tight, and depending on the nature of energy tight, I'm either running minimum energy and relying on battery, or I've got my gas generator lit, propane heat, etc.  But the point is that I adjust my demand to match the energy available, and the times the energy is available.  I'm not going to run all my compute boxes during a dark day - and I don't run them at night, either.  I run them when I've got good sun, and can range over a huge delta in energy use, depending on what's available.

Moving energy use around to when it's available solves a lot, but the usual "Oh, therefore, we must Internet of Things all the devices!" solution is beyond stupid, because nobody supports IoT past 4-5 years.  Replacing a durable 30 year good with a 5 year internet connected version doesn't seem useful to me, though it's sure profitable to people shoveling all that shit.  Provide a durable power system availability monitor to those who want it and let them control stuff manually.

I haven't even read the rest of the thread. +1 to all of this. We aren't going to "dark ages" ourselves out of this problem. The biggest reduction to our collective CO2 emissions so far is... Natural Gas. Combined cycle plants are pushing the envelope of how much energy we can get out of fuel.

The awkward problem here is that methane is both radically more powerful as a climate change gas than CO2 (the CO2 "window" is mostly full and absorbed, the methane window is far from full), and that every flyover of a methane producing facility, somehow, comes up with radically more leakage than the ground based estimates.  You're correct in that it reduces CO2 emissions, but in terms of actual GHG impact, it's far from clear that it's a huge win.

As for dark ages, well... they happen, somewhat often, and it's more useful to be prepared for them than to deny they're coming.  Western industrial civilization is on the way down, so we may as well try to do something useful about it.

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No one will want to live in a sooty fireplace heated home en masse. How would cities (which are incredibly efficient) even work that way? Nope- we need highly efficient buildings that are comfortable and better than current building standards. MMM just released that blog post on heat pumps. Future tech that works better and is 3-5x more efficient than the current tech.

Humanity has lived the bulk of its history in buildings far less comfortable, and consuming far less energy, than modern buildings.  You hit thermodynamic limits at some point.

As far as heat pumps, be very careful as to how you're comparing efficiency.  The 3-5x refers to their efficiency over electrical use, at which point you have to figure out where your electrical energy comes from - and that rating drops as temperature drops.  So, in a lot of areas, in the dead of winter, they're actually somewhat worse than a high efficiency NG furnace if you're on a high carbon grid (lots of coal or NG peakers, which tend less efficient than the big combined cycle stuff).  I think the're generally a win, and ground source is absolutely a win in terms of energy emissions, but to simply broadly claim that an air source heat pump is an improvement depends a lot on the nature of the local grid and the local temperatures.  If you're in a cold area, and falling back to electrical resistive coils on a high carbon grid, they can absolutely be worse than a NG furnace.  There's quite a bit of work being done, and the newer inverter drive stuff is nice, but it's quite area dependent, so do your actual math with climate.

It is interesting how the focus always is on electricity, not on the other parts of the energy system. Other energy carriers are often more than 50 % of the energy system, and within transport, industry and heating, it can be much more. Since heating and cooling needs often cause very high peaks, switching more of this to district heating/cooling systems can help diminish both the base loads and peak loads. And since heat often is a byproduct from industry, or can be recycled from buildings or sewage, reclaiming it can give you more usable energy without increasing production substantially.

Electrical production is the easiest to clean up, and any electrical appliance, with a higher renewable/low carbon grid, cleans up.  Deal with the easy, low hanging problems first.  If you're in a fall afternoon with a lot of coal on the grid because hydro isn't flowing, more solar cleans up literally everything.  Plus, a movement to more EV (I prefer PHEV, but recognize I'm a heretic well supported by data there) means increased electrical use, to reduce gasoline/diesel use.  It's the easy problem to solve.  Plus, you can fractionally solve it.  If you put a ton of solar on the grid, and it's producing well in the afternoons, such that you can throttle back your coal base load and idle your NG peakers, that's less emissions - period.  Even if you can't entirely solve a problem, the power grid is the easiest to reduce emissions on, if you can keep it stable.

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The bad statistics regarding rural poverty, education, and drugs, must be a US thing. Statistically, we have much more poverty and socio economic issues in urban than in rural areas. Sure, there are less kids here getting higher academic educations, but that is not where the money is today. They are becoming electricians, plumbers, builders, etc., and start making good money from the age of 16. In 2019, the unemployment in this area was 4 people (or .7 %).

The US has some very real problems with not being willing to acknowledge facts about such things because they're against some prevailing political views.

If my son isn't the most academically inclined, which... we'll see, but seems likely, I absolutely intend to encourage him down the trades/apprenticeship routes.

//EDIT: Sorry, fixed quoting.
« Last Edit: October 11, 2021, 08:54:48 AM by Syonyk »

Jon Bon

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Re: Climate change mitigation strategies
« Reply #79 on: October 11, 2021, 08:11:12 AM »
Interestingly, my city of Denver is in the process of approving a “net zero” permitting requirement. I’m oversimplifying it a bit, but effectively, new single family homes have to produce as much energy as they consume. The overall efficiency standards will be higher, and buildings will be all electric.

Commercial and multi family buildings will have similarly high efficiency standards, but solar production standards will be tied to a % of roof area.

Most surprising is that the developers aren’t really fighting it. They haven’t come out to support it either, but at least it’s not opposed.

The developers estimate total construction cost will increase by about 2%, and operating costs for energy will drop to near zero.  I’d be surprised if this doesn’t actually lower the TCO of new construction.

Getting new construction buildings close to net zero is pretty easy and cheap. It also doesn’t need much in the way of complicated heat capture systems (at least in CO climate).

Retrofitting older buildings is obviously much more expensive.

Increasing insulation by 50% yes might only cost 2% more in the cost of the project, maybe even less depending.

However, making a house net zero? I have a hard time with that. Solar is still pretty expensive up front last I checked, and if they need to be bigger aras with batteries and such I would assume it would be north of 10% the cost of the project.

I am not exactly sure what "net zero" means but as with anything you quickly run into diminishing returns. I built my addition with 50% more insulation than required, I would say back of the napkin math puts me at about 4% just for that. And I am FAR from net zero. (but I am like r24 in the walls!)




Roots&Wings

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Re: Climate change mitigation strategies
« Reply #80 on: October 11, 2021, 11:12:28 AM »
Interestingly, my city of Denver is in the process of approving a “net zero” permitting requirement. I’m oversimplifying it a bit, but effectively, new single family homes have to produce as much energy as they consume. The overall efficiency standards will be higher, and buildings will be all electric.

Commercial and multi family buildings will have similarly high efficiency standards, but solar production standards will be tied to a % of roof area.

Most surprising is that the developers aren’t really fighting it. They haven’t come out to support it either, but at least it’s not opposed.

The developers estimate total construction cost will increase by about 2%, and operating costs for energy will drop to near zero.  I’d be surprised if this doesn’t actually lower the TCO of new construction.

Getting new construction buildings close to net zero is pretty easy and cheap. It also doesn’t need much in the way of complicated heat capture systems (at least in CO climate).

Retrofitting older buildings is obviously much more expensive.

Increasing insulation by 50% yes might only cost 2% more in the cost of the project, maybe even less depending.

However, making a house net zero? I have a hard time with that. Solar is still pretty expensive up front last I checked, and if they need to be bigger aras with batteries and such I would assume it would be north of 10% the cost of the project.

I am not exactly sure what "net zero" means but as with anything you quickly run into diminishing returns. I built my addition with 50% more insulation than required, I would say back of the napkin math puts me at about 4% just for that. And I am FAR from net zero. (but I am like r24 in the walls!)

California requires net zero new homes: https://www.cpuc.ca.gov/ZNE/

Reducing your demand then solar/renewable becomes feasible. Even in a retrofit, though I still have some natural gas.

Jon Bon

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Re: Climate change mitigation strategies
« Reply #81 on: October 11, 2021, 12:16:23 PM »
Interesting, concept. In terms of the nuts and bolts its basically just a well insulated home with solar panels right?

What does a solar array cost that can generate 1000 kilowatt hours a month? Ok some quick googling here, making some big assumptions. Feel free to disagree or quote better sources.

Average house is ~1000 kw a month
That requires a 25kw solar system.
That costs ~25k just for the panels themselves. https://sunwatts.com/25-kw-solar-kits/
Maybe about 5-10k for the install?
Another 5-10k in upgraded insulation, windows and doors?

So you are looking at nearly 40k MORE for a net zero house? Maybe I am off on how the achieve the result but the low hanging fruit for energy efficient has mostly been put into the code years ago. I mean if you think hat is a good use of your dollars I absolutely think you should do that. I myself really want to go solar, probably will in the not too distant future than the EV would be next.

I just don't understand how we can add 40k to the cost of a house and scream about the affordability crisis. Don't get me wrong I am not saying that we should do nothing, I am just saying there are tradeoffs. I mean we could build a ton of solar/wind plants for 40k a house right? Basically if we are thinking in the macro/aggregate sense here having extremely dispersed solar generation is an inefficient way to do things?

Final disclaimer, I know nothing about how they build houses in CA, but I gotta image there are more expensive then hose they build them in most of the rest of the country due to fires/earthquakes etc.


Poundwise

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Re: Climate change mitigation strategies
« Reply #82 on: October 11, 2021, 12:28:33 PM »
On solar: It seems too good to be true, but for the past year I've been buying power from a solar rooftop farm in Brooklyn and my bills have gone down 10%.  Who am I to argue? We have too many trees to make solar work in our own yard and it seems counterproductive to cut them down just to put in solar panels. (If you live in the Northeast, CO, WI, or MN, feel free to use my referral link to save $25.)

Things I have done to mitigate climate change:
- we consulted flood maps before we chose our current house. Turned out to be a smart thing as neighbors were recently flooded right and left, but not our street.
- Have been trying to plant food trees, bushes, and a garden but the gardening has not been very successful so far.

Things I am about to do: I'm trying to find allies to get the church, school and town to reduce their use of two stroke engines in landscaping.  Acres of lawn are unnecessary, wasteful, and expensive to keep up. Smarter landscaping may also reduce flooding.

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Distilling the above results, the four-stroke Ryobi leaf blower kicked out 6.8 times more NOx, 13.5 times more CO and more than 36 times more NMHC than the Raptor.

The two-stroke leaf blower was worse still, generating 23 times the CO and nearly 300 times more NMHC than the crew cab pickup. Let's put that in perspective. To equal the hydrocarbon emissions of about a half-hour of yard work with this two-stroke leaf blower, you'd have to drive a Raptor for 3,887 miles, or the distance from Northern Texas to Anchorage, Alaska.
https://www.edmunds.com/car-reviews/features/emissions-test-car-vs-truck-vs-leaf-blower.html

In the process of researching retrofit kits for lawnmowers, I found this very cool forum "Welcome to EcoModder.com, an automotive community where performance is judged by efficiency and economy rather than power and speed.": https://ecomodder.com/


« Last Edit: October 11, 2021, 12:33:10 PM by Poundwise »

StashingAway

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Re: Climate change mitigation strategies
« Reply #83 on: October 11, 2021, 01:35:44 PM »


Quote
Distilling the above results, the four-stroke Ryobi leaf blower kicked out 6.8 times more NOx, 13.5 times more CO and more than 36 times more NMHC than the Raptor.

The two-stroke leaf blower was worse still, generating 23 times the CO and nearly 300 times more NMHC than the crew cab pickup. Let's put that in perspective. To equal the hydrocarbon emissions of about a half-hour of yard work with this two-stroke leaf blower, you'd have to drive a Raptor for 3,887 miles, or the distance from Northern Texas to Anchorage, Alaska.
https://www.edmunds.com/car-reviews/features/emissions-test-car-vs-truck-vs-leaf-blower.html


Those are hydrocarbon emissions, though, which don't have much to do with climate change (they're more of a smog/acid rain thing). The Raptor still puts out an order of magnitude more CO2 emissions than the leaf blower. CO2 is directly correlated to quantity of gasoline burned.

Don't get me wrong- I hate gas lawn equipment and love me some natural, low water landscapes. But leaf blowers aren't causing climate change.

NorCal

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Re: Climate change mitigation strategies
« Reply #84 on: October 11, 2021, 01:54:47 PM »
Interesting, concept. In terms of the nuts and bolts its basically just a well insulated home with solar panels right?

What does a solar array cost that can generate 1000 kilowatt hours a month? Ok some quick googling here, making some big assumptions. Feel free to disagree or quote better sources.

Average house is ~1000 kw a month
That requires a 25kw solar system.
That costs ~25k just for the panels themselves. https://sunwatts.com/25-kw-solar-kits/
Maybe about 5-10k for the install?
Another 5-10k in upgraded insulation, windows and doors?

So you are looking at nearly 40k MORE for a net zero house? Maybe I am off on how the achieve the result but the low hanging fruit for energy efficient has mostly been put into the code years ago. I mean if you think hat is a good use of your dollars I absolutely think you should do that. I myself really want to go solar, probably will in the not too distant future than the EV would be next.

I just don't understand how we can add 40k to the cost of a house and scream about the affordability crisis. Don't get me wrong I am not saying that we should do nothing, I am just saying there are tradeoffs. I mean we could build a ton of solar/wind plants for 40k a house right? Basically if we are thinking in the macro/aggregate sense here having extremely dispersed solar generation is an inefficient way to do things?

Final disclaimer, I know nothing about how they build houses in CA, but I gotta image there are more expensive then hose they build them in most of the rest of the country due to fires/earthquakes etc.

Here's a link to Denver's plan.  There's a link to a detailed PDF within that webpage.

https://www.denvergov.org/Government/Departments/Climate-Action-Sustainability-Resiliency/News-Events/News/2021/Denver-Releases-Net-Zero-Energy-New-Buildings-and-Homes-Implementation-Plan#:~:text=Denver%20plans%20to%20achieve%20net%20zero%20energy%20in,critical%20component%20to%20addressing%20climate%20change%20in%20Denver.

From my understanding, there's a lot of moving and interacting pieces.  For example, there's decent cost savings on not having to run a gas line.  And now that heat pumps are feasible in our climate, I believe it's cheaper to build in a single heat pump than to include both a furnace and AC (even though most contractors don't know how to install them yet).  Also, when there's a "net-zero" requirement, it becomes a lot cheaper for builders to include highly efficient water heaters and other appliances instead of paying to add more solar panels.  Total usage should be lower.

I'm looking at full-offset solar panels on my house (which is large at 3,400sqft), and we'd need a ~12kW system.  This admittedly excludes our gas usage for the furnace and water heater, but I think your 25kW number is a bit high.

For the sake of argument, I'll use your $40K number as a total cost.  Our electricity rates here are currently 0.13/kWh (although likely to increase by 15-20% in the near future).  For your 1,000kWh/mo house, that's $1,560/yr.  Increasing the cost of the house by $40K, but saving $1,560/yr equates to a 3.9% return to the homeowner.  While that's not as good as the stock market, it's not bad either.  Particularly when energy price inflation is taken into account.

This is something I've read up on a bit, but I don't pretend to be an expert on.  Please correct me if I am missing something.

Poundwise

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Re: Climate change mitigation strategies
« Reply #85 on: October 11, 2021, 02:26:23 PM »


Quote
Distilling the above results, the four-stroke Ryobi leaf blower kicked out 6.8 times more NOx, 13.5 times more CO and more than 36 times more NMHC than the Raptor.

The two-stroke leaf blower was worse still, generating 23 times the CO and nearly 300 times more NMHC than the crew cab pickup. Let's put that in perspective. To equal the hydrocarbon emissions of about a half-hour of yard work with this two-stroke leaf blower, you'd have to drive a Raptor for 3,887 miles, or the distance from Northern Texas to Anchorage, Alaska.
https://www.edmunds.com/car-reviews/features/emissions-test-car-vs-truck-vs-leaf-blower.html


Those are hydrocarbon emissions, though, which don't have much to do with climate change (they're more of a smog/acid rain thing). The Raptor still puts out an order of magnitude more CO2 emissions than the leaf blower. CO2 is directly correlated to quantity of gasoline burned.

Don't get me wrong- I hate gas lawn equipment and love me some natural, low water landscapes. But leaf blowers aren't causing climate change.

Are you sure?  I am by no means very knowledgeable about the subject, but I understood CO and NOx to have strong indirect roles in raising concentrations of methane, CO2, and ozone.

https://psci.princeton.edu/tips/2020/5/11/law-maintenance-and-climate-change

maizefolk

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Re: Climate change mitigation strategies
« Reply #86 on: October 11, 2021, 02:34:10 PM »
I think you may be talking past each other a little. The Non-Methane Hydrocarbons (NMHC) aren't particularly greenhouse gas-y although there are plenty of other reasons to not want them in the air. That the number being used for the leaf blower vs car comparison.

Nitrous oxide is absolutely a greenhouse gas (298x more potent than carbon dioxide) and limiting nitrous oxide emissions is a place where it's possible to have substantial impacts on global warming. See a lot of recently pressure to start measuring and then start to reduce nitrous oxide emissions from ag.

Poundwise

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Re: Climate change mitigation strategies
« Reply #87 on: October 11, 2021, 02:51:36 PM »
Thanks, that makes sense.  I actually did not know that CO and NMHC were not considered a greenhouse gases, so I learned... thanks for setting me straight, @StashingAway and @maizefolk!  Though NMHC are still nasty.

From the Princeton link I posted, it seems like banning/replacing gas powered lawn equipment would give us a lot of bang for our bucks. I think the key will be to find a way to compensate/reward those landscaping professionals who go green.

Quote
EPA data has found that gas-powered lawn mowers make up five percent of total air pollution in the United States, amounting to even more in urban areas. A sobering warning issued by the California Air Resources Board in 2017 reported the following:

“By 2020, gas-powered leaf blowers, lawn mowers, and similar equipment in the state could produce more ozone pollution than all the millions of cars in California combined.”

https://www.epa.gov/sites/default/files/2015-09/documents/banks.pdf

Abe

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Re: Climate change mitigation strategies
« Reply #88 on: October 11, 2021, 07:45:26 PM »
I’ve offset my electricity usage in Houston with a 10kW system. Cost was $20k after tax credits. To offset natural gas for heating and replace with a heat pump, we’d need another 5kW. Our house is large (3500 sqft) and kept at 76-77 during the 95+ degree summers here.

I agree that home solar is the least cost-efficient mechanism to deploy renewable energy. For me it was mostly for my own interest.

FWIWe, the previous owners kept the house at 74-75 and spent 2x what we did in the summers for electricity ($300 vs $150 pre-solar). I added insulation in the attic for $1000 and went up 2 degrees on the thermostat to get those savings. Now with solar the bill is ~$20 in the summer and should be $10 in the winter with net metering.
« Last Edit: October 11, 2021, 07:50:42 PM by Abe »

Wintergreen78

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Re: Climate change mitigation strategies
« Reply #89 on: October 11, 2021, 09:11:03 PM »
I think you may be talking past each other a little. The Non-Methane Hydrocarbons (NMHC) aren't particularly greenhouse gas-y although there are plenty of other reasons to not want them in the air. That the number being used for the leaf blower vs car comparison.

Nitrous oxide is absolutely a greenhouse gas (298x more potent than carbon dioxide) and limiting nitrous oxide emissions is a place where it's possible to have substantial impacts on global warming. See a lot of recently pressure to start measuring and then start to reduce nitrous oxide emissions from ag.

Nitrous Oxide (N2O) is a strong greenhouse gas. Fertilizer and animal manure are the main human-related sources of N2O that impact climate change.

Oxides of nitrogen (NO2 and NO) are cause by combustion. They contribute to ozone formation, which is a local and regional pollution issue, not a global issue.

Leaf blowers do contribute to local air pollution, both from NO2 an NO and other combustion pollutants. They emit CO2 from combustion, but in terms of contribution to greenhouse gas pollution, they are a rounding error.

Here’s the EPA page breaking down the major human-caused sources of GHG emissions in the US.

https://www.epa.gov/ghgemissions/sources-greenhouse-gas-emissions

Jon Bon

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Re: Climate change mitigation strategies
« Reply #90 on: October 12, 2021, 04:13:10 AM »
Interesting, concept. In terms of the nuts and bolts its basically just a well insulated home with solar panels right?

What does a solar array cost that can generate 1000 kilowatt hours a month? Ok some quick googling here, making some big assumptions. Feel free to disagree or quote better sources.

Average house is ~1000 kw a month
That requires a 25kw solar system.
That costs ~25k just for the panels themselves. https://sunwatts.com/25-kw-solar-kits/
Maybe about 5-10k for the install?
Another 5-10k in upgraded insulation, windows and doors?

So you are looking at nearly 40k MORE for a net zero house? Maybe I am off on how the achieve the result but the low hanging fruit for energy efficient has mostly been put into the code years ago. I mean if you think hat is a good use of your dollars I absolutely think you should do that. I myself really want to go solar, probably will in the not too distant future than the EV would be next.

I just don't understand how we can add 40k to the cost of a house and scream about the affordability crisis. Don't get me wrong I am not saying that we should do nothing, I am just saying there are tradeoffs. I mean we could build a ton of solar/wind plants for 40k a house right? Basically if we are thinking in the macro/aggregate sense here having extremely dispersed solar generation is an inefficient way to do things?

Final disclaimer, I know nothing about how they build houses in CA, but I gotta image there are more expensive then hose they build them in most of the rest of the country due to fires/earthquakes etc.

Here's a link to Denver's plan.  There's a link to a detailed PDF within that webpage.

https://www.denvergov.org/Government/Departments/Climate-Action-Sustainability-Resiliency/News-Events/News/2021/Denver-Releases-Net-Zero-Energy-New-Buildings-and-Homes-Implementation-Plan#:~:text=Denver%20plans%20to%20achieve%20net%20zero%20energy%20in,critical%20component%20to%20addressing%20climate%20change%20in%20Denver.

From my understanding, there's a lot of moving and interacting pieces.  For example, there's decent cost savings on not having to run a gas line.  And now that heat pumps are feasible in our climate, I believe it's cheaper to build in a single heat pump than to include both a furnace and AC (even though most contractors don't know how to install them yet).  Also, when there's a "net-zero" requirement, it becomes a lot cheaper for builders to include highly efficient water heaters and other appliances instead of paying to add more solar panels.  Total usage should be lower.

I'm looking at full-offset solar panels on my house (which is large at 3,400sqft), and we'd need a ~12kW system.  This admittedly excludes our gas usage for the furnace and water heater, but I think your 25kW number is a bit high.

For the sake of argument, I'll use your $40K number as a total cost.  Our electricity rates here are currently 0.13/kWh (although likely to increase by 15-20% in the near future).  For your 1,000kWh/mo house, that's $1,560/yr.  Increasing the cost of the house by $40K, but saving $1,560/yr equates to a 3.9% return to the homeowner.  While that's not as good as the stock market, it's not bad either.  Particularly when energy price inflation is taken into account.

This is something I've read up on a bit, but I don't pretend to be an expert on.  Please correct me if I am missing something.

Yeah the no gas line thing for sure would be some savings, no idea how much. Like most things when you do an entire neighborhood at once the per unit cost is pretty reasonable.

So we just put in a heat pump for our addition, mainly for ease install. So I will let you know how it goes. However my buddy down the street who has one of those "all electric houses" from the 70's had $800 electric bills over the winter. Heat pumps are awesome, until they are not. Granted it was likely old equipment but at some point that emergency heat comes on and it sucks watts like crazy. I will let you know how this winter goes with a new efficient unit!

Yes high efficiency appliances are a thing, but again I think they have been a thing for years. Can you even buy contractor grade stuff that is not energy star rated? I guess my point is the gains are going to be rather small there.

Whatever the return is a house is still 40k more expensive (or 30, or 50) which is hard for lots of people who are not on this forum :)
I don't see how increasing the price of a house by that much during a time when young folks are increasingly finding the house ladder out of reach. Even more so in places such as CA and CO.

Re: Math. This system will not last forever. Panels must be replaced. So if you have a 25k solar system over 30 years at a 5% discount rate that only returns $24,000. Maybe I am over sizing the system but the return is poor at best and expensive for someone who is stretching to purchase their first home.

As you can tell I would much prefer to build some massive solar/wind plants then to monkey around with the building code for returns that may or may not even be there IMO/IME. I would love for someone to disprove my math, and show me why this works but it really feels like local politicians doing something that looks good on paper and has massive externalities that they conveniently ignore.

NorCal

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Re: Climate change mitigation strategies
« Reply #91 on: October 12, 2021, 07:04:41 AM »
Interesting, concept. In terms of the nuts and bolts its basically just a well insulated home with solar panels right?

What does a solar array cost that can generate 1000 kilowatt hours a month? Ok some quick googling here, making some big assumptions. Feel free to disagree or quote better sources.

Average house is ~1000 kw a month
That requires a 25kw solar system.
That costs ~25k just for the panels themselves. https://sunwatts.com/25-kw-solar-kits/
Maybe about 5-10k for the install?
Another 5-10k in upgraded insulation, windows and doors?

So you are looking at nearly 40k MORE for a net zero house? Maybe I am off on how the achieve the result but the low hanging fruit for energy efficient has mostly been put into the code years ago. I mean if you think hat is a good use of your dollars I absolutely think you should do that. I myself really want to go solar, probably will in the not too distant future than the EV would be next.

I just don't understand how we can add 40k to the cost of a house and scream about the affordability crisis. Don't get me wrong I am not saying that we should do nothing, I am just saying there are tradeoffs. I mean we could build a ton of solar/wind plants for 40k a house right? Basically if we are thinking in the macro/aggregate sense here having extremely dispersed solar generation is an inefficient way to do things?

Final disclaimer, I know nothing about how they build houses in CA, but I gotta image there are more expensive then hose they build them in most of the rest of the country due to fires/earthquakes etc.

Here's a link to Denver's plan.  There's a link to a detailed PDF within that webpage.

https://www.denvergov.org/Government/Departments/Climate-Action-Sustainability-Resiliency/News-Events/News/2021/Denver-Releases-Net-Zero-Energy-New-Buildings-and-Homes-Implementation-Plan#:~:text=Denver%20plans%20to%20achieve%20net%20zero%20energy%20in,critical%20component%20to%20addressing%20climate%20change%20in%20Denver.

From my understanding, there's a lot of moving and interacting pieces.  For example, there's decent cost savings on not having to run a gas line.  And now that heat pumps are feasible in our climate, I believe it's cheaper to build in a single heat pump than to include both a furnace and AC (even though most contractors don't know how to install them yet).  Also, when there's a "net-zero" requirement, it becomes a lot cheaper for builders to include highly efficient water heaters and other appliances instead of paying to add more solar panels.  Total usage should be lower.

I'm looking at full-offset solar panels on my house (which is large at 3,400sqft), and we'd need a ~12kW system.  This admittedly excludes our gas usage for the furnace and water heater, but I think your 25kW number is a bit high.

For the sake of argument, I'll use your $40K number as a total cost.  Our electricity rates here are currently 0.13/kWh (although likely to increase by 15-20% in the near future).  For your 1,000kWh/mo house, that's $1,560/yr.  Increasing the cost of the house by $40K, but saving $1,560/yr equates to a 3.9% return to the homeowner.  While that's not as good as the stock market, it's not bad either.  Particularly when energy price inflation is taken into account.

This is something I've read up on a bit, but I don't pretend to be an expert on.  Please correct me if I am missing something.

Yeah the no gas line thing for sure would be some savings, no idea how much. Like most things when you do an entire neighborhood at once the per unit cost is pretty reasonable.

So we just put in a heat pump for our addition, mainly for ease install. So I will let you know how it goes. However my buddy down the street who has one of those "all electric houses" from the 70's had $800 electric bills over the winter. Heat pumps are awesome, until they are not. Granted it was likely old equipment but at some point that emergency heat comes on and it sucks watts like crazy. I will let you know how this winter goes with a new efficient unit!

Yes high efficiency appliances are a thing, but again I think they have been a thing for years. Can you even buy contractor grade stuff that is not energy star rated? I guess my point is the gains are going to be rather small there.

Whatever the return is a house is still 40k more expensive (or 30, or 50) which is hard for lots of people who are not on this forum :)
I don't see how increasing the price of a house by that much during a time when young folks are increasingly finding the house ladder out of reach. Even more so in places such as CA and CO.

Re: Math. This system will not last forever. Panels must be replaced. So if you have a 25k solar system over 30 years at a 5% discount rate that only returns $24,000. Maybe I am over sizing the system but the return is poor at best and expensive for someone who is stretching to purchase their first home.

As you can tell I would much prefer to build some massive solar/wind plants then to monkey around with the building code for returns that may or may not even be there IMO/IME. I would love for someone to disprove my math, and show me why this works but it really feels like local politicians doing something that looks good on paper and has massive externalities that they conveniently ignore.

Fair enough.  I do get the price argument.  When I think about the broader climate change issue, I actually see the building code as the cheapest place to make big changes.  I see the cost to get a house to net zero as mostly a rounding error when you're looking at new construction.  I would say it even works out to a minor net savings when you factor in lower operating costs.  But it's a pretty massive cost when you're talking about retrofitting.

Also, I dug through the cities estimates.  It's worth flipping through, as they have some good cost estimate details in there.  Their studies estimate that an all-electric construction would save about $27.5K for a single family home.  I can buy that when you're including the costs of trenching and running new gas lines through a neighborhood.  So if you're saving $27K in costs, but adding $40K in panels (I do think that estimate is high by $5-$10K, but I haven't researched in detail), it's pretty minor compared to the cost of new construction here.

The things that have to happen to mitigate climate change in other sectors are massive in comparison.  Getting to net zero in manufacturing, aviation, steel, cement etc. ranges from massively expensive to technically impossible with today's technology.  There are plenty of startups working on technologies in these fields, but the technology is nascent and massively expensive.

Most of my frame of reference comes from Bill Gates climate change book and the IPCC summary for lawmakers.  I found the book to be a good combination of what has to happen, what is realistic, and what technologies are available.  He also makes some great points about what problems wind and solar can solve, and which problems they can't solve.

I realize I should probably broaden my reading on the topic, and am very much looking for recommendations.

StashingAway

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Re: Climate change mitigation strategies
« Reply #92 on: October 12, 2021, 09:44:34 AM »
Thanks, that makes sense.  I actually did not know that CO and NMHC were not considered a greenhouse gases, so I learned... thanks for setting me straight, @StashingAway and @maizefolk!  Though NMHC are still nasty.

From the Princeton link I posted, it seems like banning/replacing gas powered lawn equipment would give us a lot of bang for our bucks. I think the key will be to find a way to compensate/reward those landscaping professionals who go green.

Quote
EPA data has found that gas-powered lawn mowers make up five percent of total air pollution in the United States, amounting to even more in urban areas. A sobering warning issued by the California Air Resources Board in 2017 reported the following:

“By 2020, gas-powered leaf blowers, lawn mowers, and similar equipment in the state could produce more ozone pollution than all the millions of cars in California combined.”

https://www.epa.gov/sites/default/files/2015-09/documents/banks.pdf

Color me embarrassed. I was wrong

GuitarStv

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Re: Climate change mitigation strategies
« Reply #93 on: October 12, 2021, 10:12:37 AM »
Thanks, that makes sense.  I actually did not know that CO and NMHC were not considered a greenhouse gases, so I learned... thanks for setting me straight, @StashingAway and @maizefolk!  Though NMHC are still nasty.

From the Princeton link I posted, it seems like banning/replacing gas powered lawn equipment would give us a lot of bang for our bucks. I think the key will be to find a way to compensate/reward those landscaping professionals who go green.

Quote
EPA data has found that gas-powered lawn mowers make up five percent of total air pollution in the United States, amounting to even more in urban areas. A sobering warning issued by the California Air Resources Board in 2017 reported the following:

“By 2020, gas-powered leaf blowers, lawn mowers, and similar equipment in the state could produce more ozone pollution than all the millions of cars in California combined.”

https://www.epa.gov/sites/default/files/2015-09/documents/banks.pdf

Color me embarrassed. I was wrong

Can we all take a minute to pause and recognize that the motorized leaf blower is a solution without a problem.  Something that exists only to waste, and serves little to no valid reason for being.

It's like swiffers or little plastic bottles of water.

Syonyk

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Re: Climate change mitigation strategies
« Reply #94 on: October 12, 2021, 10:36:07 AM »
I am not exactly sure what "net zero" means but as with anything you quickly run into diminishing returns.

In general, "net zero" means that over the course of a year, you produce as much energy as you consume.  It does not mean you produce it when you consume it, or it would be an off-grid system or Passivhaus or such.  So, on sunny spring/fall days, you produce a ton during the day and use very little, in the summer you produce a ton and use a ton, and then "bank" that sort of thing for the winter, when you typically won't produce much and will use a ton.

How this works with the greater power grid in more than "There are a few of you..." has yet to be determined, because we don't have energy storage systems that can bank a summer surplus and release it in the winter, at least not in any sort of even faintly cost effective way.  It also tends to imply a fully electric house, which is fine... though in a colder climate, you probably need a ground source heat pump to be of any use regarding heating.  NG peaker -> power grid -> air source heat pump in the cold is rather higher emissions than just burning NG directly for heat in a furnace (as your coefficient of performance heads down towards one).  Typically, overnight heating is the hardest part for heat pumps, because it's cold, and there's no solar to be feeding in.

One can gain a lot when aiming for "net zero" by doing things like designing for passive solar gain as well, but that then requires siting houses with the good exposure facing south (or north), vs "Whatever happens to fit the subdivision plan we just laid out on the farm field."  Solar gain also tends to require open spaces between houses, not the standard "As big as possible, lotline to lotline, reach out and shake your neighbor's hand" style construction that is popular.t

Average house is ~1000 kw a month
That requires a 25kw solar system.

Are you in northern Alaska or something?

I'm on a 15.9kW system, not aimed optimally for production (I generate more power in the mornings and evenings when I use it at the cost of total annual mid-day production), and so far in 2021, I've generated 18.5MWh - which is far in excess of the 12MWh/yr that you're using as an estimate.  I'll probably be around 20-21MWh this year.  A 10kW peak system should generate your estimated needs, if not a bit smaller.

You can install that yourself for about $15k before incentives, so the actual cost to a homebuilder should be under $20k.  Though, with the 5000 sq ft monstrosities that pass for new homes these days, you'd have to be a good bit larger.

So we just put in a heat pump for our addition, mainly for ease install. So I will let you know how it goes. However my buddy down the street who has one of those "all electric houses" from the 70's had $800 electric bills over the winter. Heat pumps are awesome, until they are not. Granted it was likely old equipment but at some point that emergency heat comes on and it sucks watts like crazy. I will let you know how this winter goes with a new efficient unit!

Older heat pumps tended to fall down to a COP of around 1 at 32-40F.  Newer ones hold that down far lower, into the -20F range.  They're radically improved, and the newer inverter drive stuff improves efficiency as well, because it's not just banging on and off.  A multi-head mini split system can also reduce use, because you only heat where people are.  But don't assume that 50 year old heat pumps in any way resemble current performance.

Quote
Yes high efficiency appliances are a thing, but again I think they have been a thing for years. Can you even buy contractor grade stuff that is not energy star rated? I guess my point is the gains are going to be rather small there.

I'm not aware of much new construction using heat pump water heaters, and those are massive gains over the standard resistive type heat pumps.  If you've got a "hot attic" design anywhere, you can duct that space to the heat pump and have very minimal energy use for a lot of the year.  Or, you can design solar thermal collectors in as well - a lot of systems will have two tanks, with one serving as the preheat tank, and the second one just keeping it warm (or making up the difference in the winter).

Quote
As you can tell I would much prefer to build some massive solar/wind plants then to monkey around with the building code for returns that may or may not even be there IMO/IME. I would love for someone to disprove my math, and show me why this works but it really feels like local politicians doing something that looks good on paper and has massive externalities that they conveniently ignore.

... well, I'm with you there.  So won't attempt to disprove it.  Just use legitimate values for solar install costs during construction.

As for leaf blowers and such, they simply don't matter from a climate change perspective.  You're free to argue against them, but if you're going to talk about their emissions from a GHG perspective, you're concerned about CO2, and they simply don't emit that much of it because they don't burn much fuel.  It's absolutely deceptive to compare various other side emissions and then claim that those percentages mean that they're a huge GHG problem.  They're not, and replacing them with batteries that are infrequently used may very well be worse for GHG emissions, given the processing needed for batteries that won't be used terribly much (as compared to those cells going into transportation).

maizefolk

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Re: Climate change mitigation strategies
« Reply #95 on: October 12, 2021, 11:20:21 AM »
Nitrous Oxide (N2O) is a strong greenhouse gas. Fertilizer and animal manure are the main human-related sources of N2O that impact climate change.

Oxides of nitrogen (NO2 and NO) are cause by combustion. They contribute to ozone formation, which is a local and regional pollution issue, not a global issue.

Leaf blowers do contribute to local air pollution, both from NO2 an NO and other combustion pollutants. They emit CO2 from combustion, but in terms of contribution to greenhouse gas pollution, they are a rounding error.

Nitrous oxide vs oxides of nitrogen. You are correct. Chemistry was always my worst subject in school.

Thank you for both the correction and the explanation @Wintergreen78.

HSBW

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Re: Climate change mitigation strategies
« Reply #96 on: October 12, 2021, 11:24:54 AM »
I am not exactly sure what "net zero" means but as with anything you quickly run into diminishing returns.

In general, "net zero" means that over the course of a year, you produce as much energy as you consume.  It does not mean you produce it when you consume it, or it would be an off-grid system or Passivhaus or such.  So, on sunny spring/fall days, you produce a ton during the day and use very little, in the summer you produce a ton and use a ton, and then "bank" that sort of thing for the winter, when you typically won't produce much and will use a ton.

How this works with the greater power grid in more than "There are a few of you..." has yet to be determined, because we don't have energy storage systems that can bank a summer surplus and release it in the winter, at least not in any sort of even faintly cost effective way.  It also tends to imply a fully electric house, which is fine... though in a colder climate, you probably need a ground source heat pump to be of any use regarding heating.  NG peaker -> power grid -> air source heat pump in the cold is rather higher emissions than just burning NG directly for heat in a furnace (as your coefficient of performance heads down towards one).  Typically, overnight heating is the hardest part for heat pumps, because it's cold, and there's no solar to be feeding in.

I want to question the bolded statement a bit. From a little bit of searching it seems a combined cycle NG peaker could be ~50% efficient which would require a heat pump to have a COP of ~2+ to be as efficient as burning NG directly in 90% efficient furnace correct? I'm seeing at least some newer air source heat pump units that can achieve the ~2 COP as low as 5F which is as low as it would get in large portions of the country (frigid midwestern prairies excluded). Since the majority of the year it would be warmer than that, yielding better COP for the heat pumps, as well as the linkage to the electrical grid theoretically allowing for an increasingly cleaner energy source mix, its seems to me that an air source heat pump would be a good bet for the future when considered against a NG furnace. Please correct me if I've made poor assumptions here.

Syonyk

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Re: Climate change mitigation strategies
« Reply #97 on: October 12, 2021, 11:50:38 AM »
From a little bit of searching it seems a combined cycle NG peaker could be ~50% efficient which would require a heat pump to have a COP of ~2+ to be as efficient as burning NG directly in 90% efficient furnace correct?

It depends on what's running as a peaker.  The combined cycle stuff tends to be more base load, or daily load curves, and they don't get used as peakers that often.  Most peakers are the simple cycle stuff, because the costs of combined cycle aren't worth it, and the simple turbines load follow better.  They're in the upper 30%s for efficiency, typically.

Minus grid losses.  The power grid isn't superconducting, and while it's fairly efficient, grid losses are about 5% of the power generated (EIA estimate).

So, if you put 1kWh thermal in, and get 370Wh out, minus 5%,  you're about about ~350Wh.  A good high efficiency furnace can be 95%+, so 950Wh thermal out of 1kWh thermal input (yes, I know, sorry, I do my thermal math this way because I work mostly with electrical systems).

That requires a COP of around 2.7, and a good number of units start dropping below that in the winter temperatures.  I'm also fairly certain the COP #s don't consider icing - if you have to defrost regularly, it hurts the COP quite a bit (worse if it's burning the backup coils to keep the outlet air warm while it's running the air conditioning cycle).

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...its seems to me that an air source heat pump would be a good bet for the future when considered against a NG furnace. Please correct me if I've made poor assumptions here.

In most areas it is, but it also is going to depend a bit on your overnight energy mix.  They're generally going to be an improvement, but if it's particularly cold, it's worth actually sitting down and doing some math if you care.

HSBW

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Re: Climate change mitigation strategies
« Reply #98 on: October 12, 2021, 12:28:35 PM »

In most areas it is, but it also is going to depend a bit on your overnight energy mix.  They're generally going to be an improvement, but if it's particularly cold, it's worth actually sitting down and doing some math if you care.

Makes sense. I would think the final calculation will be very location dependent on those coldest of winter nights. The calculation will skew one direction or the other depending on the local electricity grid mix. If that state still has any coal plants the calculation gets worse. If there is some degree of production from wind/hydro/nuclear and combined cycle NG the calculation will look a bit better. Looking at one higher end ASHP in particular, the COP ranges from 2.4-1.8 at 5F depending on the output required. My gut would say that that piece of equipment would be around break even with a +90% efficiency NG furnace at the those low temperatures with the advantage to the ASHP for anything warmer for the grid in my state. I'd like to run some calculations to confirm that at some point. Do you know of any resources for electricity grid source mix on individual days or parts of days? Most of what I've seen is yearly aggregate totals which, while interesting, are not as useful for assessing a particular timeframe like overnight in January.

Syonyk

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Re: Climate change mitigation strategies
« Reply #99 on: October 12, 2021, 12:45:35 PM »
I don't.  I keep meaning to log Idaho Power's energy mix over the long term, but I haven't gotten around to sucking that in.  There's a lot of coal in the winter nights, though.  It's heavily hydro in the spring, lots of wind, but we're coal heavy in the fall and winter in the mix.