There is a new method to create waste backed crypto with anaerobic digestion. This is an unlimited resource. You can convert waste and sewage to electricity in these new plants and then sell the electricity with Energy Web Token (EWT). Send a private message for more details if you are interested.
Still not adoption coin on real project or energy, they always give as label for their coin product with energy but in fact just sell coin to investor and listed on exchange market, after success selling left and try to make other coin with different connecting to get positive respond from investor.