The National Renewable Energy Laboratory released a report last month that explains both the costs and the benefits of renewable portfolio standards (RPS). More than half of all U.S. states have RPS policies, which have been instrumental in fueling renewable energy implementation over the past 10 years. According to the study’s abstract, “Among the 24 states for which the requisite data were available, estimated RPS compliance costs over the 2010–2012 period were equivalent to, on average, roughly 1% of retail electricity rates,” ranging from “-$4/MWh (i.e., a net savings) to $44/MWh across states.” According to the release, the “report also surveys recent studies that have assessed the magnitude of potential broader societal benefits…([which] cannot be directly compared to RPS compliance costs).”