A wide-ranging bill backers say will ensure South Carolina has plenty of electric power passed a key vote Wednesday in the House, but opponents complained it would roll back billions of dollars in lessons learned after a proposed nuclear plant never generated a watt of power. The bill faces one more routine vote before heading to the Senate. The short term goal for supporters of the bill is to make sure private Dominion Energy and state-owned utility Santee Cooper can build a natural-gas fired power plant in the Lowcountry.