“The issue is that while the energy may be 100% Green, they can sell on the Renewable Obligation Certificates (ROCs) to other “dirty” suppliers to enable them to fulfil their obligation. Therefore, they charge a premium to customers for the green tariff and then sell on the certificate to other suppliers. Only if they retire the ROCs voluntarily can they really say they increasing the requirement for green. However, doing this would double your energy bill.”

All very confusing but if both Green Energy and Good Energy are selling their ROCs to dirty suppliers, then all they are doing is shifting the demand from one supplier to another and not increasing it at all. I think I’ll ask them… watch this space.