A Dominion Virginia Power program that supports so-called clean energy now has more than 20,000 customers. The five-year-old Dominion Green Power program offers ratepayers the option of matching their home electricity use with renewable energy by either usage or in fixed monthly amounts. The option based on usage translates to an additional $13 on the typical monthly power bill. Dominion says the Green Power customers “go above and beyond” to support green power. The top five cities with the strongest customer participation are Richmond, Alexandria, Arlington, Virginia Beach and Charlottesville.