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December 20, 2025

Reserves

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.
© RTO Insider
MISO Recounts Tough Summer; Monitor Praises Lack of Emergencies
MISO said 2025 was the most demanding summer since 2012, though it steered the grid with only a single maximum generation event.
PJM
PJM Operating Committee Briefs: Sept. 11, 2025
PJM's Operating Committee heard an update on the Aug. 11 load-shedding event in Baltimore, which brought 20 MW offline for about half an hour following equipment failures at the Brandon Shores substation
MISO
MISO on Track to Wrap Summer with 122-GW Peak, Addresses Frequent South Advisories
MISO is poised to close the door on summer with an almost 122-GW peak while issuing several capacity advisories for MISO South.
Shutterstock
NYISO BIC Dissects Power Prices During June Heat Wave
NYISO shared a detailed analysis of New York’s late June heat wave, in which significant operating reserve shortages elevated energy prices.
IESO
IESO Seeks Feedback on Revised Storage Model
IESO opened discussions on new rules for storage facilities and hybrid resources that will enable the provision of regulation service.
Constellation Energy
FERC Approves Constellation Purchase of Calpine with Conditions
FERC approved Constellation's purchase of Calpine, which will create an even bigger IPP with nearly 60 GW around the country, with the biggest share of that in PJM.
© RTO Insider
ERCOT Board of Directors Briefs: June 23-24, 2025
ERCOT CEO Pablo Vegas has gone public with the grid operator’s internal terminology that is shaping the market’s path forward, defining it for his Board of Directors and stakeholders. 
MISO
MISO Declares Max Gen Emergency in Heat Wave
MISO Midwest entered emergency status during the RTO’s first serious heat wave of the summer.
Power Advisory
Operating Reserve Prices Surge in Ontario

The opening of Ontario’s nodal market has been marked by real-time volatility and unusually high operating reserve prices.


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