World energy production by source in 2004: Oil 40% coal 23.3% natural gas 22.5% hydroelectric 7.0% nuclear 6.5% biomass and other 0.7%.
The Economist November 16, 2006 Tax subsidies and installation of new windmill generating capacity in the U.S. Role of subsidies in wind energy investments
The Economist November 16, 2006 Energy investments as a percentage of total venture capital, United States As energy prices rise, incentive to invest in the sector increase
Renewable Energy Sources include Hydroelectric; Wood; Waste; Alcohol Fuels; Geothermal; Solar; and Wind
The Role of Renewable Energy Consumption in the Nation’s Energy Supply, 2004 US Department of Energy
Renewable sources account for 6% of U.S. energy consumption