Make renewables more expensive and kill their job prospects. That will definitely MAGA

With fewer cyclic power sources, no need to improve storage technology

He was right, I'm tired of winning

This from Nov 2017:
The threat was already in motion last fall. Trump had 60 days from then to make the decision on tariffs. The decision he just did.

https://www.dallasnews.com/business/energy/2017/11/09/100-million-texas-solar-project-hold-trump-administration-threatens-tariff

$100 million Texas solar project on hold as Trump administration threatens tariff

Snip
Although the commission ruled that action was needed, its range of proposals didn't satisfy Suniva. The company had asked for tariffs that could have translated to 50 percent or more for some components.
"The remedy recommended by the ITC is disappointing because it will not heal the damage suffered by this American high-tech manufacturing sector from what has been a tidal wave of imports," according to the company's statement. "The ITC's remedy simply will not fix the problem the ITC itself identified, and with it, we'll see very shortly the extinction of what remains of this manufacturing sector ..."

Tariff supporters have argued this would create new U.S. manufacturing jobs that were killed by foreign subsidies.
Opponents have said that's a small percentage of the U.S. solar market and higher costs will cost far more jobs — as many as 88,000 — than it would save.

Nonetheless, another example of Trumpian shortsighted business understanding.