NEPGA filed a Limited Protest of the cost-of-service (COS) agreement for the Mystic Units (No. ER18-1639), asking FERC to correct for certain terms in the proposed COS agreement that could cause energy and capacity market price suppression, including the limit on Mystic Unit energy offers to not exceed Energy Market Reference Levels (which are set by the Internal Market Monitor), terms governing third-party sales of LNG, and a term requiring that ISO-NE offer the Mystic Units as price-takers in the FCA.