Vineyard Wind, the wind farm under construction off the coast of Massachusetts, has begun delivering energy to the power grid from five of its planned 62 wind turbines, company and state officials said Thursday. The five turbines are operating at full capacity, generating 68 megawatts of power — enough to power about 30,000 homes, according to company officials, who described it as the first large-scale offshore wind farm in the nation to begin initial operations. The Vineyard Wind project is located 15 miles (24 kilometers) off Martha’s Vineyard and is projected to generate el...