NYISO requested a three-year extension to comply with FERC Order 881, saying it needs more time to implement software and hardware updates needed to support ambient-adjusted ratings on transmission lines.

NYISO stakeholders gave final approval to rules for "internal controllable lines" and revisions to day-ahead market congestion settlement procedures.

NYISO members approved new rules for ambient line ratings and HVDC lines.

FERC partly approved Order 881 compliance filings from several transmission providers, asking for more information on timelines for calculating or submitting ambient-adjusted line ratings.

FERC approved the compliance filings of six transmission providers, including those of NYISO and CAISO, with Order 88.

Grid-enhancing technologies took center stage last week at a WATT Coalition summit on ways to wring efficiencies out of existing transmission facilities.

FERC denied rehearing requests from transmission providers and others on Order 881.

FERC issued a proposal to require all transmission providers to implement seasonal and ambient-adjusted ratings on their lines.