What we're doing with blockchain and blockchain-related technologies is to create a single sort of truth. As I mentioned at the beginning, each organization currently has its own balance of what it sold and what it bought, but each one is keeping that information in a completely separate system.
If you really want to know if someone is tricking the system, you have to go back one by one and make sure everyone is telling you the truth. If you have a single source of truth, then you automatically are going to know if the balances don't add up. If you're selling more renewable energy than has been produced, this is going to show.
We were working a couple years ago with a Chilean electricity regulator to solve exactly that problem, of their having more RECs than the actual renewable energy that was created.