Earlier quoted context omitted.
A friendly reminder that PoW runs just fine on 100% renewables. It's the job of regulators to make sure all PoW runs this way. Just like it's the job of regulators to mandate renewable energy for literally all other industries.
how would they do that practically? would require a huge surveillance state with constant monitoring to make sure you’re not mining on non allowed power
Mining rigs already require tremendous amounts of power, and there are already laws on the books that allow the government to know what you're doing with that power (i.e. for safety and environmental reasons). You can easily determine which power sinks are mining rigs, and require them to use only excess renewable power, or off-grid renewable power (it's pretty easy to tell if you're using off-grid fossil fuels with satellite imagery -- you can't hide the CO2).
Governments can easily enforce this -- simply require all blocks to be signed by a government-issued keypair to attests to the green-ness of the power used to produce them, and require exchanges under its jurisdiction to deny, limit, or tax the sale of non-green coins.