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December 5, 2025

NYISO Market Monitoring Unit (MMU)

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NYISO Monitor Says More Data Needed to Verify Out-of-market Actions
The NYISO Market Monitoring Unit told the Installed Capacity Working Group that more data is necessary to verify the need for out-of-market actions on the part of transmission owners for reliability.
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NYISO Management Committee Passes Comprehensive Reliability Plan
The NYISO Management Committee voted to approve the ISO’s 2025-2034 Comprehensive Reliability Plan, though stakeholders and the Market Monitoring Unit again voiced concerns with how it is structuring its planning.
Potomac Economics
NYISO Monitor Report Highlights Generator Outages During Heat Wave
As NYISO continues its Capacity Market Structure Review, the Market Monitoring Unit used its second-quarter State of the Market report to highlight potential issues with how the ISO forecasts resource availability.
NYISO
NYISO Stakeholders Concerned About Lack of Data on Supplemental Commitments
Stakeholders requested the NYISO Market Monitoring Unit provide an explanation of the difficulties in obtaining data from the ISO and market participants on supplemental commitments after it presented its State of the Market report for the first quarter.
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NYISO Monitor Proposes Changing Congestion Rent Assignments

The NYISO Market Monitoring Unit is proposing to revise the ISO’s net congestion rent assignment process by allocating residuals to transmission owners on an individual facility basis.

Astoria Generating Company
NYISO Makes Case for Repowering in Latest ‘Power Trends’ Report

Amid increasing demand and dwindling supply, repowering aging fossil plants would help maintain reliability while still lowering emissions in line with New York’s climate change policy goals, NYISO argues in its annual “Power Trends” report.

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NYISO Business Issues Committee OKs Firm Fuel Accreditation Concept
The NYISO Business Issues Committee approved, in concept, implementation of the ISO’s new firm fuel election process and requirements as part of its changes to capacity accreditation.
NYISO
NYISO Monitor Highlights Gap Between Planning, Market Requirements
NYISO's transmission planning requirements result in a need for more capacity than is required in the ISO’s market rules, according to Potomac Economics, the Market Monitoring Unit.
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NYISO Working Group Meeting Briefs: Oct. 1-2, 2024
NYISO proposed to increase the Rate Schedule 1 carryover to $5 million, while the Installed Capacity Working Group discussed different ways to incentivize transmission security via the markets.
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NYISO ICAP Working Group Briefs: Sept. 24, 2024
NYISO’s Market Monitoring Unit, Potomac Economics, presented recommendations for addressing what it calls inefficient market outcomes caused by setting locational capacity requirements based on the transmission security limit.

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