> Bitcoin doesn't discriminate between green energy sources and fossil fuel energy sources.

BINGO!

If you have something that will buy any left over or unusable stock of product X, the production of X becomes less risky and easier to invest in. This isn't hard. Bitcoin incentivizes energy production and innovation. If you want that energy to be green, bitcoin is still more than willing to buy it from you. Lowering the risk of innovation in the space is obviously good for green energy.