February 23, 2025

planning reserve margin (PRM)

Anemic Loads, Plentiful DR Boost MISO Summer Outlook
MISO expects a 19.2% planning reserve margin this summer, well above its 15.8% requirement, and a percentage point above its projection last year.
SPP RSC Leaves Safe-Harbor Thresholds Unchanged
SPP’s Regional State Committee (SPP RSC) accepted a working group’s proposal to leave unchanged their safe-harbor thresholds.
MISO 2017/18 Planning Reserve Margin at Nearly 16%
MISO will have a 15.8% planning reserve margin for the 2017/18 planning year, up slightly from last year, according to the RTO’s loss-of-load-expectation study.
SPP Task Force Prepares to Hand off its Work
The SPP Capacity Margin Task Force conducted its penultimate meeting  as it continues to set up the stakeholder group that will replace it.
Board Orders Negotiation in Auction Disagreement
Independent Market Monitor David Patton asked MISO’s Board of Directors to suspend the RTO’s work on the proposed redesign of its capacity auction.
MISO Sees Enough Capacity for Summer
MISO has adequate capacity to meet summer demand, though there’s a good chance the RTO will dip into its load-modifying resources.
SPP Board of Directors Briefs
The SPP board of directors' approval of the RTO’s first reduction in its planning reserve margin since 1998 almost left members wanting more.
SPP to Cut Planning Reserve to 12%, Reduce Capacity Needs by 900 MW
SPP members voted last week to reduce the RTO’s planning reserve margin to 12% from the current 13.6%.
SPP Capacity Margin Task Force Shares ‘How Low’ Reserve Margin Can Go
The SPP task force updating the RTO’s planning reserve margin requirements shared its draft report on loss-of-load expectations.
MISO Seasonal Procurement, Site Auctioning Proposals Face Opposition
MISO officials outlined proposals to boost its capacity resources, winning support for efforts to streamline the generator interconnection process and redraw its zonal boundaries to reflect constraints.

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