Renewable Portfolio Standards and the North American Free Trade Agreement

Some opponents of renewable portfolio standards have argued that they violate the North American Free Trade Agreement because various state definitions of eligible renewable sources have a differential effect on providers.  These comments, co-authored with Nancy Rader and funded by the Union of Concerned Scientists, respond to these concerns by describing the consistency of RPS mandates with international trade law and unraveling the misunderstandings that caused them to be seen as discriminatory against non-U.S. power sources.