I wonder whether these charts show a fair comparison. The purchasing power parity conversion helps, but are they including the other costs on the electricity or natural gas bills?
For example, we currently pay 11¢/kwh for electricity and 91¢/therm for natural gas. However, each billing period there is a fixed delivery charge of $15.11 for electric and $12.30 for gas. With our usage (236 kwh and 10 therms per month), breaking the fixed charges up by the average use in the past 12 months would give an effective rate of 17¢/kwh and $2.04/therm. 17¢/kwh still isn't a lot compared to many of the other countries on the chart, but it does show how much of a difference including a fixed charge could make (61% increase for electric, 124% increase for gas).