Different uses of terminology on each side of the Atlantic and different market structures complicate discussion of market policies. A "Renewables Portfolio Standard" (RPS) is known in Europe as a "tradable renewables obligation," or a "percentage obligation." It should not be confused with what is often termed a "quota system" or "green label trading," which are only partial uses of the full RPS concept and thus limited in their effectiveness.
This article is edited from a survey of the RPS at work in the US completed by Nancy Rader for Windpower Monthly. The full article and attachments, which contain a wealth of detail and explanation, are free to subscribers at www.windpower-monthly.com.
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