I went looking for information about electricity rates, and found a treasure trove. The US Energy Information Administration collects and publishes a huge amount of information on energy consumption, costs, and fuel sources, both in the US and overseas. It's pretty well organized, with both html and downloadable spreadsheets for most information. All courtesy of US taxpayers.
I was looking for the information with an eye to more work on photovoltaics. The more expensive conventional electricity generation becomes, the easier it is for solar and other technologies to compete.