claim: Barack Obama and Joe Biden will establish a 10 percent federal Renewable Portfolio Standard ( RPS ) to require that 10 percent of electricity consumed in the U.S. is derived from clean, sustainable energy sources, like solar, wind and geothermal by 2012.
evidence: A Renewable Portfolio Standard ( RPS ) is a mandate that requires electricity providers to supply to their customers a minimum amount of power from renewable sources, usually as a percentage of total energy use.