Using data from FERC and rooftop solar power estimates of my own*, it seems that 69% of newly installed US electricity generation capacity was from renewable energy power plants, with 67% from solar and wind power. In the month of December, 100% of new power capacity came from wind and solar projects.
Meanwhile, total installed coal power capacity declined from 326.6 GW at the end of 2014 to 305.05 GW at the end of 2015. In other words, net, 21.55 GW of coal power capacity were taken offline in 2015.
