Bottom line, clean energy is getting cheaper so it cuts emissions of bigger emitters. Purely economical side-effect.

I think the bigger picture would be to look at solar panel installments and their overall contribution in the energy package of the US.

Hints: "Solar accounts for 55% of all US electricity added so far in 2018." Source: https://www.businessinsider.com/more-solar-power-than-any-ty...

And in the same article: Solar cost lower than coal in North America since 2013: https://amp.businessinsider.com/images/5af0a65e19ee8624008b4...