Why should I vote no on Proposition 7 in California?

How could what it proposes be a bad thing? California Proposition 7, would, if approved, require California utilities to procure half of their power from renewable resources by 2025. In order to make that goal, levels of production of solar, wind and other renewable energy resources will more than quadruple from their current output of 10.9%. It will also require California utilities to increase their purchase of electricity generated from renewable resources by 2% annually to meet Renewable Portfolio Standard requirements of 40% in 2020 and 50% in 2025. Current law AB32 requires an RPS of 20% by 2010.