I have been doing some surface-scratching reading about energy market derivatives. In particular, electricity market derivatives. Nowadays, when one trades futures on an index such as the S&P 500, at maturity they are cash settled, and rarely does one actually receive a "delivery" of holdings in the index.
However for commodities, delivery is much more common. Such as oil, wheat, copper, gold etc. I understand how an oil futures contract might be delivered, simply, barrels would be shipped to your location. However, electricity market derivatives are different. I have tried searching, finding this to be closest answer, but it didn't specifically answer how they are delivered.
Would such a question be considered as "off topic"?