The trend is upward elsewhere, too. Utilities in 36 states offer some form of green pricing, and last year 430,000 households bought green power -- up 20 percent from a year earlier, the U.S. Energy Department reported.
Besides increasing the amount of clean energy being used, such programs educate consumers about renewable energy sources, said John Kelly, director of research and economics for the American Public Power Association, which represents public utilities.
"There is this continual education effort, so you have a few progressive states and utilities that kind of lead the way," he said.
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