Energy-efficiency and fuel-switching, for example, accounted for 40% of the projects started last year, while biomass, wind- and hydro-power made up another 24%.

ECONOMIST: Climate change

It is developing giant off-shore wind turbines, biomass power plants (including projects in Florida and Washington with Duke Energy), and, with its Ausra acquisition, solar thermal power plants.

FORBES: Solar Thermal or Solar Photovoltaic? Areva Says 'Both!'

The remaining 40% would come from wind farms, along with a smaller element of biomass and hydropower as a back-up.

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The "cubic mile of oil"--a metric roughly equivalent to the amount of oil consumed worldwide each year--is frequently used to explain the challenge facing solar, wind, geothermal and biomass power.

FORBES: America's Best Places For Alternative Energy

From wind and solar, to waste and biomass to energy, fuel cells, co-generation, natural gas, and smart grid, speakers and attendees discussed a diverse portfolio of advanced energy technologies that are being developed and deployed in Ohio.

FORBES: The Business of Advanced Energy

Count hydropower, biomass, tidal, geothermal, waste-to-energy, solar and wind, and you have only 6.1% of the rich world's energy supply in 1995.

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