January 22, 2025

ambient-adjusted ratings (AARs)

SPP
SPP MOPC Briefs: Jan. 15, 2025

The SPP Markets and Operations Policy Committee has approved tariff revisions that would implement dispatchable transactions in the real-time energy market.

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FERC Gets Mixed Advice on How Quickly to Move on DLR Requirements

The commission received dozens of comments on its advanced notice of proposed rulemaking that would require broad use of dynamic line ratings across the U.S. transmission grid.

NYPA
NYISO Asks FERC for an Extension to Comply with Order 881
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.
NYSERDA
NYISO Management Committee Briefs: Nov. 29, 2023
NYISO stakeholders gave final approval to rules for "internal controllable lines" and revisions to day-ahead market congestion settlement procedures.
NYISO
NYISO Stakeholders Advance Rules on Ambient Ratings, Internal Controllable Lines
NYISO members approved new rules for ambient line ratings and HVDC lines.
PPL
Grid-enhancing Technologies Poised for Growth with Federal Funds
Grid-enhancing technologies have been piloted in many places, but with recent FERC orders and federal funding, they are poised to become much more common.
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SPP Markets and Operations Policy Committee Briefs: July 10-11, 2023

SPP stakeholders endorsed a tariff revision request that adds a winter resource adequacy requirement for load-responsible entities bound by the grid operator’s recent planning reserve margin increase.

MISO
Order 881 Timelines Need Explaining, FERC Says
FERC issued orders directing transmission providers to clarify their timelines for calculating and submitting ambient-adjusted line ratings under Order 881.
NYPA
FERC Approves Batch of Line Ratings Compliance Filings
FERC approved the compliance filings of six transmission providers, including those of NYISO and CAISO, with Order 88.
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MISO, Members Debate Deploying AARs
MISO, its Monitor and members debated the best course to implementing ambient adjusted line ratings during a Sept. 15 Advisory Committee discussion.

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