Renewable energy projects largely don't make economic sense when supplying energy to the grid. They need a buyer of their power when the grid doesn't want it.
This is where Bitcoin miners come in.
All environmentalists should be bitcoiners.
Discussion
It will take environmentalists to be open minded by being curious of the opposing views.
When you say largely, I'm guessing you're excluding hydroelectricity? Excellent source of power, near-zero emissions beyond construction, and can be easily dialed up and down to meet demand. Just watch out for the salmon lobby :p
Yes hydro is exempt from this. I'm thinking more of intermittent renewables like wind and solar.
Geothermal is also example from my example.