Gov. Jerry Brown has signed legislation requiring California utilities to obtain 33 percent of their electricity from renewable energy sources by 2020.
California's 2008 law to limit greenhouse-gas emissions is seen as Gov. Arnold Schwarzenegger's biggest achievement. If it is undone by Proposition 23, other similar laws could follow, experts say.
The California governor wants to use his own plan to push the state toward using 33 percent renewable energy by 2010. But it might not be legal.