Upcoming Changes

Increased Reserve Requirements

1.8.2026 00:00 to 12.31.2026 00:00

Due to the non-performance of committed Synchronized Reserve resources during Synchronized Reserve Events since the implementation of Reserve Price Formation (October 1, 2022) and to maintain compliance with NERC Standards, effective from May 19, 2023, PJM carried an additional 30% on the Reliability requirement component of Synchronized and Primary reserve in the RTO only in the Day-Ahead, and Real-time Markets for all hours. Effective January 9, 2026 instead of 30% PJM will carry an additional 20% on the Reliability requirement component of Synchronized and Primary reserve in the RTO only in the Day-Ahead, and Real-time Markets for all hours until further notice.

For example (rounded to whole MW): If the largest single contingency = 1,630 MW

Default (100% of largest contingency)

Synchronized Reserve requirement: 1,630*1 + 190 = 1,820 MW

Primary Reserve requirement: 1,630*1.5 + 190 = 2,635 MW

30-Minute Reserve requirement: Max(3,000, gas contingency, PR reliability) + 190 = 3,190 MW

Increased reliability by 20%

Synchronized Reserve requirement: 1,630*1.2 + 190 = 2,146 MW

Primary Reserve requirement: 1,630*1.2*1.5 + 190 = 3,124 MW

30-Minute Reserve requirement: Max(3,000, gas contingency, PR reliability) + 190 = 3000 + 190 = 3,190 MW

If you have any questions regarding this message, please contact PJM Customer Service at (866) 400-8980 or send an email to custsvc@pjm.com. Thank you.

Maintenance to PJM.com on September 23 from 5:00 p.m. – 9:00 p.m. EPT

9.23.2026 from 17:00 to 21:00

PJM will be performing system maintenance in the Production environment on Wednesday, September 23, 2026, from 5:00 p.m. - 9:00 p.m. EPT (1700-2100 hours).

During this maintenance, PJM.com and subsidiary sites will experience intermittent unavailability for approximately 30 minutes.

Impacted Websites

PJM.com

Maintenance to Tools in Prod. and Train on Sept. 23 from 6:00 p.m. - 7:00 p.m. EPT

9.23.2026 from 18:00 to 19:00

PJM will be performing system maintenance in the Production and Train environments on Wednesday, September 23, 2026, from 6:00 p.m. - 7:00 p.m. EPT (1800-1900 hours). During this maintenance, there will be an outage of up to 5 minutes.

Impacted Tool

Data Viewer

DER Directory

Messages

PJM Tools home page

Resource Tracker

Maintenance to Tools in Prod. and Train on Sept. 23 from 6:00 p.m. - 7:00 p.m. EPT

9.23.2026 from 18:00 to 19:00

PJM will be performing system maintenance in the Production and Train environments on Wednesday, September 23, 2026, from 6:00 p.m. - 7:00 p.m. EPT (1800-1900 hours). During this maintenance, there will be an outage of up to 5 minutes.

Impacted Tool

Data Viewer

DER Directory

Messages

PJM Tools home page

Resource Tracker

Maintenance to TC Planner in Prod. and Train on Sept. 24 from 10:00 a.m. - Noon EPT

9.24.2026 from 10:00 to 12:00

PJM will be performing system maintenance in the Production and Train environments on Thursday, September 24, 2026, from 10:00 a.m. - Noon EPT (1000 - 1200 hours).

During this maintenance, users may see page expiration errors and would need to log out and log back in to resolve.

Impacted Tool - TC Planner

Maintenance to TC Planner in Prod. and Train on Sept. 24 from 10:00 a.m. - Noon EPT

9.24.2026 from 10:00 to 12:00

PJM will be performing system maintenance in the Production and Train environments on Thursday, September 24, 2026, from 10:00 a.m. - Noon EPT (1000 - 1200 hours).

During this maintenance, users may see page expiration errors and would need to log out and log back in to resolve.

Impacted Tool - TC Planner

Software Release to DR Hub in Prod. on Sept. 24 from 3:00 p.m. - 5:00 p.m. EPT

9.24.2026 from 15:00 to 17:00

PJM will be releasing software to DR Hub in the Production environment on Thursday, September 24, 2026, from 3:00 p.m. - 5:00 p.m. EPT (1500 - 1700 hours). During this maintenance, there will be an outage of up to 30 minutes.

DR Hub Release Notes

Impacted tool

DR Hub

Hudson Scheduling Restriction

9.24.2026 15:45 to 1.6.2027 00:00

The Hudson path is restricted to 250MW from Sep 24, 2026 15:45 until Jan 6, 2027 00:00 due to NY outage.

Please reference the NY system for the outage ticket in the event of updates done after this posting.

Maintenance to Various Tools in Prod. and Train on Sep. 24 from 5:00 p.m. - 7:00 p.m. EPT

9.24.2026 from 17:00 to 19:00

PJM will be performing system maintenance in the Production and Train environments on Thursday, September 24, 2026, from 5:00 p.m. - 7:00p.m. EPT (1700-1900 hours).

During this maintenance, there will be an outage of up to 1 hour.

Impacted Tools:

Cost Agent (Production only)

Data Viewer (Production only)

DER Directory

ELCC Calculator (Production only)

Messages

NextGen

PJM Tools home page

Queue Scope

Resource Tracker (Production only)

Rescheduled: Maintenance to eCredit and InSchedule in Prod. on Sep. 17 to Sep. 24 from 5:00 p.m.-7:00 p.m. EPT

9.24.2026 from 17:00 to 19:00

The maintenance communicated below has been rescheduled to Thursday, September 24, 2026. from 5:00 p.m. - 7:00 p.m. (1700 - 1900).

****Previous Message****

​​​​​PJM will perform a system maintenance in the Production environment on Thursday, September 17, 2026, from 5:00 - 7:00 p.m. EPT (1700 to 1900 hours). During this maintenance, there will be an outage of up to 60 minutes.

Impacted Tools

eCredit

InSchedule

Maintenance to Various Tools in Prod. and Train on Sep. 24 from 5:00 p.m. - 7:00 p.m. EPT

9.24.2026 from 17:00 to 19:00

PJM will be performing system maintenance in the Production and Train environments on Thursday, September 24, 2026, from 5:00 p.m. - 7:00p.m. EPT (1700-1900 hours).

During this maintenance, there will be an outage of up to 1 hour.

Impacted Tools:

DER Directory

Messages

NextGen

PJM Tools home page

Queue Scope

Happening Today: Maintenance to Markets Gateway and Stale Data in Prod. on Sept. 25 from 3:00 p.m. - 5:00 p.m. EPT

Today from 15:00 to 17:00

PJM will be performing system maintenance to Markets Gateway in the Production environment on Friday, September 25, 2026, from 3:00 p.m. - 5:00 p.m. EPT (1500-1700 hours). During this maintenance, there will be an outage of up to 2 hours.

Stale data will appear on Markets Gateway, Data Miner, Data Viewer, PJM Now and Markets and Operations page of PJM.com.

Impacted Tools

Markets Gateway

Hudson Scheduling Restriction

9.28.2026 00:01 to 9.30.2026 23:00

The Hudson path is restricted to 0MWs from Sep 28, 2026 00:01 until Sep 30, 2026 23:00 due to eDART tickets 1289787 and 1320649.

Please reference the Transmission Facilities Outage List for the above mentioned eDART ticket in the event of updates done after this posting.

https://edart.pjm.com/reports/linesout.txt

Temporary Changes to the Synchronized Reserve Requirements

9.28.2026 08:00 to 10.1.2026 16:00

PJM may carry additional Reserve MW effective hour ending 8 of September 28, 2026 through hour ending 16 of October 1, 2026 due to a temporary switching condition on the system. Reserve requirements being cleared in Real-Time can be viewed under the Dispatched Reserves screen in Data Viewer.

If you have any questions, please contact PJM's Member Relations or 610-666-8980

Maintenance to eGADS in Prod. on Sep. 29 from 11:00 a.m. - Noon EPT

9.29.2026 from 11:00 to 12:00

PJM will be performing system maintenance in the Production environment on Tuesday, September 29, 2026, from 11:00 a.m. - Noon EPT (1100-1200 hours). During this maintenance, there will be an outage of up to 10 minutes.

Impacted Tool

eGADS