The problem is that the US's comparative advantage over China will surely be solar services (installation, maintenance, support) rather than raw hardware manufacturing. And the solar service industry is hurt by tariffs on Chinese panels.
Solar Fabrication plants are being made in the USA, and from my understanding, we have higher-tech panels which reach higher levels of efficiency. If the solar manufacturing industry gets a boost in the US, then we can likely make them cheaper too, due to the scaling of mass production.
This is a nice read: https://www.americanprogress.org/issues/green/reports/2017/0...
Quote: "The nation is on track to overdeliver on the emissions reduction commitments it put forward under the Paris climate agreement"
And: "Compared with the Chinese coal fleet, even the best U.S. plants are running older, less efficient technologies."
https://www.eia.gov/todayinenergy/detail.php?id=16271
Cleaner coal plants in China are still dirtier than natural gas plants in the US.
China greenhouse gas emissions per capita are less than half the USA's.[1]
1. https://wri.org/blog/2014/11/6-graphs-explain-world%E2%80%99...
China has 320 GW of installed hydro power, compared to 80 in the US.
China had 160 GW of installed wind power in 2016, compared to 80 in the US.