I've been working in solar public policy in NYC for a while, and solar is absolutely the future not just for cryptomining but for the grid as a whole. It is already at price parity with fossil fuel based technologies in most states: https://www.scientificamerican.com/article/rooftop-solar-cost-competitive-with-the-grid-in-much-of-the-u-s/. There is a company doing customized installations for miners using only renewables - solar4mining.com, and once you start adding energy storage into the equation, mining gets much more profitable.