Five years after NStar became the first Massachusetts utility to allow customers to buy electricity supplied by a wind farm, its Green program has failed to catch on. Fewer than 1 percent of the company’s nearly 900,000 customers have enrolled. The dismal response resembles lackluster participation in similar renewable energy programs offered by other utilities, worrying state officials as they push toward a goal of generating 20 percent of electricity from renewable energy by 2020.
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