Which is balanced by decreased value of additional coins, so less interested miners should drop out.
But the energy itself is kind of misleading, because miners will flock to lower cost energy, which should primarily be excess green energy. If we actually adopt this at scale, I expect energy companies to help in mining crypto with their excess energy generation, which should work well since that excess should be fairly consistent I'm a global scale.
That said, I'm extremely interested in seeing how proof of stake works out for Ethereum, since it just seems wasteful to mine coins for verifying transactions. But I think it's a lot less wasteful than opponents make it out to be.