In the US, coal electricity is now just 30% of the grid, compared to 32% for other fossil fuels (almost all natural gas), and actually 38% for emissions-free (half of that is nuclear and the other half a mix of wind, hydro, solar, and geothermal roughly in that order).

That means the US CO2 emissions per kWh are significantly better than Germany, by the way.

And beware of old data. Even a couple years makes a difference. From 2014 to 2017, CO2 emitted per kWh has dropped by 13%.

(My figures mostly come from here, which has up to date info through December 2017: https://www.eia.gov/electricity/monthly/epm_table_grapher.ph... along with calculations for emissions per kWh based on efficiency and CO2 per heat unit for a given fuel source.)