Connecticut, Delaware, Illinois, Maine, Maryland, Massachusetts, New Hampshire, New Jersey, New York, Ohio, Pennsylvania, Rhode Island, and Texas all have deregulated markets which allow for it.
California, Georgia, Michigan, Oregon, and Virginia have partially deregulated markets.
Connecticut, Delaware, Illinois, Maine, Maryland, Massachusetts, New Hampshire, New Jersey, New York, Ohio, Pennsylvania, Rhode Island, and Texas all have deregulated markets which allow for it.
California, Georgia, Michigan, Oregon, and Virginia have partially deregulated markets.