Nice to see you may have learnt something and of course feel the need to pass it on. But considering you have claimed in the past to have a physics degree, it's a bit late to finally understand the basics?
After all, this was explained more than adequately in an O level applied dynamics course. The effort of a 'standard' horse to raise a known weight via a frictionless block and tackle in a given time.
It's been the way of measuring electricity usage for many a year. And can be related to the usage of any energy. It only confuses those of feeble minds. If any measure uses the same time (one hour, say) it can be disregarded for working out costs as it's a constant.
That you seem to imply you've suddenly re-invented the wheel - or just discovered how it works - surprises no one.
We're more used to you quoting maker's figures without a clue about how they're derived. Filling a bath, for example, without saying how big that bath is, or the final temperature, or the starting point of the cold water.
So it's nice to see you've at last discovered basic principles.