Sloped Demand Curve Necessary in New England Posted on April 22, 2014February 3, 2015 NEPGA Press Release on comments filed on ISO New England sloped demand curve filing at FERC (Docket No. ER14-1639) NEPGARelease-Sloped_Demand_Curve_in_New_England1.pdf Posted in Document Archive, Press Releases & Reports.