Renewable energy would be at least 4 percent of all utility resource portfolios in the nation beginning in 2011, according to a draft Senate bill released this week. The renewable energy standard would be ramped up yearly until 2021, where it would top out at 20 percent. Credit trading would be allowed—in which one company could sell credits for excess renewable energy to another company lacking enough to meet its requirement. Renewable energy would include solar, wind, geothermal, biomass, landfill, and wave energy, as well as cogeneration. Incremental additions to existing hydropower would also be recognized. The secretary of energy would “issue tradable renewable energy credits” from new renewable and efficiency projects, Existing renewable energy would receive non-marketable credits, according to the draft. Tribal land-based facilities would receive double credits. The proposed legislation assumes a national market for trading credits. State’s rights, like California’s higher standards, would be respected under the plan.