As energy has a usefulness and intrinsic value that even gold lacks. It could be traded anonymously like cash like batteries as dollars or as energy storage and quick and efficient transfers becomes smaller and more convenient. Im thinking specifically electrical energy with batteries and capacitors but even gas could be used.
It could be created by individuals with solar panels or bike mounted generators. It could be stored as potential energy in large amounts as heat or pressure and then converted back to electrical energy when needed. It could be networked for large transfers. There could even be large banks that hold energy as a business, but they would not be able to lend more than they hold. Private individual energy storage would be the most secure from government or other seizure obviously.
Wheres the flaw?
The "petrodollar" as energy backed currency is a myth. Our dollars are not backed by petroleum stores. This is what investopedia says about the petrodollar:
The dollars we use are not petrodollars. The petrodollar is an accounting term. It is, in a way, a measure of how much of our inflation we export to other countries to keep us afloat as our dollar printing press's go BRRRR. What it is not, is a "energy backed dollar."
Bitcoin doesn't store energy, it requires it. It carries no intrinsic energy value whatsoever.
No they do not. However, I agree it is, at least in principle possible, if we had better tech to store and exchange energy. The above two are not examples of it however.