EIA - Electricity Data

In 2015 the total US generation was 4,087,381 MW hours 
Coal generated 1,356,057 MW hours 
Gas Generated 1,335,068 MW hours 
Nuclear generated 797,178 MW hours 
Wind generated 190,927 MW hours 
Solar 38,614 MW hours. 
In other words, 
Coal 33% 
Gas 32.6% 
Nuclear 19.5% 
Wind 4.6% 
All Solar 0.9%. 
Yep, the 40% growth in 2015 really put solar on the top of the heap. If it keeps going at that rate, it might generate 1% of all the electricity in 3 or 4 years.



EIA - Electricity Data