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The U.S. Department of Energy's (DOE) National Renewable Energy Laboratory (NREL) has released its annual assessment of utility green power programs. According to the analysis, more than 850 utilities across the United States now offer green power programs. Green power sales in 2008 increased by about 20 percent over 2007, and they represent more than 5 percent of total electricity sales for some of the most popular programs. Wind is the primary source of electricity generated for green energy programs nationwide. Using information provided by utilities, NREL developed top ten ranking of utility programs for 2008 in the following categories: * Total sales of renewable energy to program participants * Total number of customer participants * The percentage of customer participation * Green power sales as a percentage of total utility retail electricity sales * Lowest price premium charged for a green power program using new renewable resources