Lynn Good, Duke’s chief executive, is undecided about the EPA’s carbon-dioxide emissions plan. U.S. coal companies and at least 16 state governments are working on challenges to the Obama administration’s new rule limiting carbon emissions from power plants. Most electric utilities have a different strategy: They are embracing it. The main reason, executives and experts say, is that economic forces are pushing the power industry inexorably toward a lower-carbon future. “Everybody is moving in this direction anyway,” said Dominion Chief Executive Tom Farrell. The new regulations just add certainty to companies’ plans to move away from relying on coal to generate electricity, turning instead toward cheap natural gas as well as renewable energy, which is available at increasingly lower cost. “Price is a larger force in electricity markets today than what Washington is doing with regulations,” said Todd Carter, president of Panda Power Funds, a private-equity investor and generating-plant […]