Under Good’s leadership, Duke Energy, which provides electricity to 7.6 million customers, is slowly pivoting away from fossil fuels. It added more than 1,000 megawatts of renewable energy in the past year and announced that it will close seven coal plants over the next three decades. Revenues hit $23.2 billion, and profits were up slightly in 2017. Yet the stock has languished, dropping 6% over the past 12 months—owing in part to what the company says are the short-term effects of new tax regulation.