... capacity factor assumed for wind. In prior years a 30% capacity factor was assumed, but in 2008 estimates of MW were based on a 33% capacity factor to reflect improvements in capacity factors ... Total Retail Sales of Green-e Energy Certified Renewable Energy, 2007 and 2008 (Million kWh) Year 2007 2008 2007 2008 2007 2008 RECs82 50 7,305 10,4907,387 10,540Green Pricing834 1,413 367 ... 00.511.522.533.5420002001200220032004200520062007 2008 Residential Premium, cents/kWhAverageMedian Figure 3. Trends in utility green pricing premiums, 2000 -2008 10 Green Pricing Customer Participation At the end of 2008, about...