This graph depicts how the EIA thinks we’ll be ramping up our use of renewable energy for electrical generation over the next 25 years. Notice how the use of windmills grows explosively over the first four years, then abruptly stops. Biomass takes up the slack. Biomass?!

Biomass has generated energy from the time it created the first fire, and wood is still the largest bioenergy resource available today. Other sources include food crops, grasses, agricultural residues, manure and methane from landfills.

Source: EIA Annual Energy Outlook 2010