Your answer to this question was just a Google search away for you...lol...lol...Don't be having us do your simple searches for you when you are perfectly capable of doing what I just did for you...lol.Some people dont realize how powerful steam is, btw, isnt more electricty in the usa made by steam?
This was in the article URL link posted below:
Most electricity is generated with steam turbines using fossil fuels, nuclear, biomass, geothermal, and solar thermal energy. Other major electricity generation technologies include gas turbines, hydro turbines, wind turbines, and solar photovoltaics.
Electricity in the U.S. - U.S. Energy Information Administration (EIA)
The major fuel/energy sources and their contribution to annual U.S. electricity generation.
www.eia.gov