This is by far the coolest and most informative way to look at the electricity grid in the US – where the power is coming from, how is it distributed, and what is the potential for alternatives (wind, solar, biomass, natural gas, etc). In addition, you can see how different regions focus on different power sources. There is ALOT of data behind this, and you can hover over things to find out additional information. Check it out!
Part of a special series in 2009, I would love it if someone got the dataset from NPR and continued to update it!