You can't make the current system better, its designed to be as wasteful as possible. If I somehow managed to implement something that made the hashing use half

You can't make the current system better, its designed to be as wasteful as possible. If I somehow managed to implement something that made the hashing use half as much electricity, it wouldn't result in any reduction of power usage, instead it would just double the number of hashes and then the difficulty increases to account for that. This isn't difficult to understand if you had thought about it for more than 5 minutes.