Can you clarify what that digets per kilowatt-hour means? If I own 1 million Joules, then how is efficiency specified? Since 1 million Joules in oil has a diffe

Can you clarify what that digets per kilowatt-hour means? If I own 1 million Joules, then how is efficiency specified? Since 1 million Joules in oil has a different worth/value than 1 million Joules in hydrogen, I don't understand how one can trade Joules. The point of currency should be interchangeability. If people don't actually own money as joules, but money as "widgets" or "joules of oil"+"joules of hydrogen".., then you can just abstract away the energy stuff. I'm not impressed by the energy as currency concept. Money should reflect all resources, including energy, human labour etc. Binding currency to something (like gold) doesn't seem to be useful.