Here in Belgium, the governement subsidized installation of rooftop solar panels in order to speed up adoption. Seems like a good idea at first, until some smart dudes figured out that the subsidies where worth more then the actual solar power. So companies who could pay the upfront costs of massive installations started doing that, which caused a massive hole in the governement budget, so they decided to tax everybody who uses electricty. The keyword here is 'everybody', as in, also the people who don't have solar panels (which includes me :( ) . So that SUCKED. Just ranting.

Also check out: https://solarcoin.org -> coins for every kWh of solar energy generated.