The standards range from modest to ambitious, and qualifying energy sources vary. a clean energy standard (CES) adopted by seven states, which require a certain percentage of a utility’s electricity to come from renewable or alternative energy sources.a renewable portfolio standard (RPS) adopted by 29 states and the District of Columbia, which require a certain percentage of a utility’s electricity to come from renewable energy sources.Most of these requirements take the form of:
Twenty-nine states and the District of Columbia require electric utilities to deliver a certain amount of electricity from renewable or other clean energy sources.
