Energy consumption is energy consumption. While you might be connected to a grid where renewable sources are accessible, you are still straining a grid which could cover for an area which uses less clean energy sources.

But it’s not like every mining rig is connected to a source of renewable energy. It’s untraceable, which is part of the concept behind bitcoin. It should be obvious that a decentralized, untraceable, energy intensive cryptocurrency is not somehow controlled to be driven primarily by green sources.