I expected you to say this, but hoped you wouldn't. Of course I know they talk about it. GOP campaigns say and do a lot of things, there's dozens of topics they shout about. From Benghazi to Hillary's Emails to gender-neutral emails to immigrants to indeed coal/renewables and so on. You could easily name 30 topics.
The topics have different purposes. Fossil fuels vs renewables in particular hasn't won the reps a single race, I repeat. Every race they've won, they would've won without it. And every race they've lost, they would've lost without it. The purpose of bringing up that particular topic for them isn't to help win close races.