US energy source mix

It's notable how nuclear power has increased from near zero in the early 1970's.  Heating your home with wood is still fairly common in older homes in areas where timber is widely available like the Pacific Northwest. 

Both charts are from Energy in the United States at Wikipedia.  Now that natural gas is relatively inexpensive, it is gaining share in energy generation particularly as a replacement for coal.

The costs of nuclear are understated because of failure to include waste handling costs.  Spent fuel is expensive to deal with and no long term solution has been agreed upon.