I agree. Miners should go green and invest on solar panels and a powerfuk enough battery to store all the solar energy. But plotting a solar panel board on one's house is not that simple due to the complexity of the circuit, capacity of the battery, and the environment to which you are located on.
For your information,bitcoin mining is now an industry where millions of dollars are spend and you need to have a big storage space and you really need a lot of electricity and most of the farms in China is run on renewable energy ,fixing a solar panel in your house is not a hurdle anymore,it is a bit expensive but if you are getting a lot of sun shine,then you must try solar panels.