The US Energy Information Administration says differently about sources of USA electrical power.
Renewables: 17%, including wind 7.3%, hydro 6.6%, solar 1.8%, biomass 1.4%, geothermal 0.4%
Nuclear: 20%
Hydrocarbons: 62% (not 80%), including natural gas 38%, coal 23%, petroleum 1%.
All as of 2019. Source: https://www.eia.gov/energyexplained/electricity/electricity-in-the-us.php
The next question to answer is, what is the trend in sources of US electrical power? EAI says, renewables are doubling by 2050, coal is declining through mid-2020s. For 2050 they forecast:
Renewables: 38%, including solar 17%(!), wind 13%, hydro 5%
Nuclear: 12%
Hydrocarbons: 49%, including natural gas 36%, coal 13% (down from 23%).
Source: https://www.eia.gov/outlooks/aeo/
I read another headline recently that solar electricity is now the cheapest source of electrical power in history, but I can’t cite that source. I read another article about how environmentalists are blocking new coal power plants on economic grounds — the power they are generating is now more expensive than power from renewable alternatives.
The source of power charging these batteries is not an obstacle.