What mix of power plants produce the electricity that is supplied to your household or community? Are you interested in learning more or does it affect you?
The EPA also has a great tool based on the eGrid data called Power Profiler that's built to answer your exact question--the mix of electricity in any part of the country. Check it out! http://www.epa.gov/cleanenergy/energy-and-you/how-clean.html
resources for finding electricity mixes
The Federal agencies have some good resources that help with this!
EPA's eGrid database provides the most comprehensive list of power plants and environmental impacts associated with them: http://www.data.gov/communities/node/48/data_tools/5165 . EIA also has lots of data on what type of electricity is generated in different states: http://www.data.gov/communities/node/48/data_tools/5293
The EPA also has a great tool based on the eGrid data called Power Profiler that's built to answer your exact question--the mix of electricity in any part of the country. Check it out! http://www.epa.gov/cleanenergy/energy-and-you/how-clean.html