Reliability Must Run (RMR) Agreements have been used by RTOs (including PJM) to keep certain power plants operating past their planned retirement dates in order to prevent reliability problems.

Source: https://americaspower.org/reliability-must-run-agreements/

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PJM Generation Asset Monitor Update | Capacity News

This update provides a high-level overview of our recently published PJM Generation Asset Monitor (GAM) report and database. The PJM GAM tracks the Interconnection queues for additions, forecasts plant retirements and plants deemed at risk of retirement, and provides an outlook for the timeline of renewable generation projects in PJM, MISO, NYISO and ISO-NE.