1、 https:/crsreports.congress.gov Updated February 24, 2021A Brief History of U.S. Electricity Portfolio Standard ProposalsElectricity portfolio standards are designed to change the set of energy sources used to generate electricity, usually by establishing requirements on utilities to procure a perce
2、ntage of electricity from specified eligible sources. Since the 105th Congress, 76 proposals for a national portfolio standard have been introduced, but none has become law. This analysis provides historical context on federal portfolio standard proposals. Previous Federal Proposals CRS sought to as
3、semble a comprehensive list of federal portfolio standard proposals through a search in Congress.gov. A full description of the search methodology and the list of previous legislation is available in CRS Report R45913, Electricity Portfolio Standards: Background, Design Elements, and Policy Consider
4、ations. Of the proposals CRS identified, the earliest bill was introduced in 1997 in the 105th Congress. Some proposals were stand-alone; in other words, a national portfolio standard was the only provision in the bill. Other proposals included a portfolio standard alongside other provisions. As Fig
