According to the latest "Energy Infrastructure Update" report from the Federal Energy Regulatory Commission's Office of Energy Projects, renewable energy sources (i.e., biomass, geothermal, solar, water, wind) accounted for 49.10% of all new domestic electrical generating capacity installed in the twelve months of 2012 for a total of 12,956 MW. More than a quarter of that new capacity (25.29% - 3,276 MW) came online in the month of December 2012 alone.