[Jabanga]

>which currently use a ridiculous amount of electricity to process somewhere between 2 TPS to 20 TPS.

The electricity consumption is a result of the mining subsidy, and artificially high fees from block space constraints, not fundamental costs for transaction processing.

If you break down the necessary costs (storage, bandwidth, CPU cycles for verification), it's actually very low, at about $0.001 (a tenth of a cent) a transaction:

https://bitcointalk.org/index.php?topic=3332.0

The mining subsidy is a fixed cost that will decrease in relation to the total number of transactions as transaction volumes increase.