Working on my "Top Ten Things to Save The World" list. Using less household energy is somewhere on the list - I don't know just where yet. But I did a quick check on the EnergyStar site. They think I'm doing better than 75% of households. In the process I found my electricity/propane bills have declined 28% in two years. That's good news. I can probably do better with caulking leaks and adding insulation. I definitely have to figure out the water heater question.
Soon I'll look at less packaging and local food. Then I'll move on to things in the community.