That's not true at all.
You can enter a power cost into this calculator: https://www.nicehash.com/profitability-calculator/nvidia-rtx...
It comes out positive using energy prices from virtually anywhere.
The idea that mining is powered purely by renewables that would somehow otherwise go to waste (that is, not take fossil fuel plants offline) is pure FUD.
That's not true at all.
You can enter a power cost into this calculator: https://www.nicehash.com/profitability-calculator/nvidia-rtx...
It comes out positive using energy prices from virtually anywhere.
The idea that mining is powered purely by renewables that would somehow otherwise go to waste (that is, not take fossil fuel plants offline) is pure FUD.