IESO Seeks Comment on Revised Monitoring Requirements

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IESO, which currently has 54 PMUs monitoring 24 facilities, expects to increase that number to 240 PMUs at 111 facilities, including 30 inverter-based resources. | IESO

Dec 22, 2025 | Rich Heidorn Jr.

IESO released proposed market rule and manual revisions to require synchrophasor data from storage resources.

Energy Storage Generation IESO Technical Panel IRO NPCC Transmission Operations

KeywordsIndependent Electricity System Operator (IESO)interconnection reliability operating limit (IROL)North American Electric Reliability Corp. (NERC)Novel Applications for Synchronized Power Instrumentation (NASPI)phasor measurement unit (PMU)supervisory control and data acquisition (SCADA)synchrophasors

Rich Heidorn Jr.

IESO Drops Termination Option for Long Lead-time RFP

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