Among the options receiving attention are various types of renewable portfolio standards, also known as renewable electricity standards or clean energy standards, depending upon their specific design. (robertstavinsblog.org)
Adopt a national renewable portfolio standard requiring 20 percent of electricity to be generated from renewable energy sources by 2020, and 30 percent by 2030. (treehugger.com)
Thirty - four states have adopted renewable portfolio standards to produce a larger share of their electricity from renewable sources over the next decade or so. (treehugger.com)