I don't have any numbers for my servers, but power consumption is very negligeable. That's the whole point of PoS and DPoS, not to use power at all. Even when replaying, it's a single threaded process, which doesn't even scratch the full potential of the CPU. As for my full RPC node (hived+hivemind) it barely uses 5% of the CPU. Also, the active witnesses are around 100, a far cry from the tens of thousands of PoW miners out there for all those high profile blockchains wasting energy.