“…The information presented in this report is based on data collected by the National Renewable Energy Laboratory (NREL). Since 1999, NREL has collected information on green pricing program participants, participation rates, retention rates, price premiums, green energy sales, new renewables capacity installed to supply green pricing programs, and enrollment requirements (Bird and Swezey 2003a, Swezey and Bird 2000, Swezey and Bird 1999. Prior to 2002, information was collected by telephone.…”