This is still the case in some markets, e.g. in Texas's partially deregulated electric market. Consumers can sign up with any of 20 or so electric providers, so

This is still the case in some markets, e.g. in Texas's partially deregulated electric market. Consumers can sign up with any of 20 or so electric providers, some of whom provide "100% green electricity", usually for a price a bit higher than the cheapest providers.