ISO-NE’s Capacity Auction Reforms project will include an evaluation of additional resource accreditation modeling enhancements, the RTO told the NEPOOL Markets Committee.

As ISO-NE undertakes major capacity market accreditation reforms, New England storage developers are voicing concerns that potential flaws in the RTO’s modeling methodology could discourage new investments in storage resources.

FERC said it needs more explanation behind MISO’s plan to use a capacity accreditation that would accredit resources based on a combination of their projected availability and historical performance during periods of high system risk.

FERC approved NYISO’s proposed tariff revisions to more accurately accredit natural gas resources’ capacity, but the commission delayed their implementation until 2026.

A relatively low turnout of constructed capacity in recent years could deepen a potential 2.7-GW capacity deficit in summer 2025 to more than 14 GW by summer 2029, MISO and OMS revealed in a five-year projection.

SPP’s resource adequacy stakeholder group has moved several policies that indicate the team’s work is “coming home” after months of presentations and discussions.

Stakeholder voices criticizing the design of MISO’s proposed, probabilistic capacity accreditation outnumbered those expressing support before FERC.

SPP’s effort to impose capacity accreditation methodologies for thermal and renewable resources has drawn protests from public-interest and clean-energy groups at FERC.