While NEPOOL Class I REC pricing saw a retreat in 2015 compared to 2014, prices for the spot vintages in all markets (except Maine) remained robust near their newly established low-$50sresistance level. NEPOOL Class I REC pricing tracked within 95% of their respective ACPs in 2013 and most of 2014, bringing into focus assumptions of persistent undersupply. Nevertheless, as REC generation increased in 2015, the NEPOOL Class I REC market became adequately supplied and REC prices pulled back.