This is weird (odd). Anthony Watts says he got an offer from his electricity company to buy renewable energy, at a small premium (archived here). The weird thing is not that he scoffed at the offer, that is to be expected from a dim denier. No, the weird thing is that it seems that Anthony has never heard of such a product before.
I don't know about where you live, but where I live I've worked with electricity distributors who've offered this as an option for more than twenty years. (I just checked my records and one of my clients was preparing to launch a "green energy" option back in 1991/92. It might have taken a couple of years before the company that bought them offered it, but that's still twenty years ago or more.) Now as far as I know, the option is offered by most electricity resellers here in Australia - for example Red Energy, Origin, and AGL all offer "green" options.
Money money money...
Anthony explained also how he's got solar panels. He made it abundantly clear that it's not because he gives a damn about the environment. He doesn't. In fact the purpose of his blog WUWT is largely to urge his readers to rape and pillage nature. He's been an activist for planetary destruction for more than seven years now. The reason Anthony got solar panels was so that he could save some money, and so that he could make money off his readers - seriously - see here. He's shameless.