I haven't been keeping up with the Eth / PoS development, do we have any preliminary numbers on how much energy this switch is hoped to save? Same goes with sharing, how much is it argued this will speed up the transaction process?
If you consider that modern systems with the required specs can run on 10W, you should get ~90kWh in a year.
Transaction-speed wise, there is a lot of talk about 100000+ TPS, but the general consensus seem to be that this will only be achieved with extra L2 support and that a more realistic number for "pure on-chain" throughput is in the high-hundreds / low thousands.