The National Renewable Energy Laboratory (NREL) on November 21 released the 2012 Renewable Energy Data Book on behalf of the Energy Department's Office of Energy Efficiency and Renewable Energy. The annual report is an important assessment of U.S. energy statistics for 2012, including renewable electricity, worldwide renewable energy development, clean energy investments, and data on specific technologies. Among the key findings are: renewable electricity represented 14% of total U.S. installed capacity and more than 12% of total U.S. electric generation in 2012; installed U.S. renewable electricity capacity is more than 163 gigawatts; and in 2012, wind energy and solar photovoltaic systems were two of the fastest growing electric generation technologies in the United States. Cumulative U.S. installed wind energy capacity increased by nearly 28%, and cumulative installed U.S. solar photovoltaic capacity grew more than 83% from the previous year. The 2012 Renewable Energy Data Book is produced by NREL's Strategic Energy Analysis Center. See the NREL press release.