OK it's not a government subsidy, it's paid for by consumers. I see some power companies choose to offer a premium green service, but others may simply charge everybody more. Wikipedia says half of American states have renewable energy quotas, that means power companies will want to buy it at an artificially high price regardless of whether consumers want it.

If more renewable power was generated, the premium prices would fall and further growth would be stopped.

Well what I keep trying to get at is we can't just cover the planet with solar panels because it would cost more than coal, oil, gas or nuclear.