EIA: Energy Information Administration
"The Energy Information Administration (EIA), created by Congress in 1977, is a statistical agency of the U.S. Department of Energy. The EIA provides policy-independent data, forecasts, and analyses to promote sound policy making, efficient markets, and public understanding regarding energy and its interaction with the economy and the environment."

The EIA has a website which contains a wealth of information on the energy sector. One page, "Energy Topics" contains statistical data on topics ranging from acid rain to oil stocks. The information is well documented and presented in considerable detail.