PJM averted blackouts by asking plants to delay maintenance: how

The U.S. Department of Energy issued an emergency order effective Oct. 13 through Oct. 16 for the PJM Interconnection region, which manages the electric grid serving Maryland and parts of 12 other states plus Washington, D.C. 14, and a Maintenance Outage Recall for Oct. 14.

PJM attributed the tight conditions to unusually warm fall weather combined with planned equipment outages required for maintenance and construction. The Department of Energy cited elevated electricity demand, planned power plant maintenance outages and transmission system work occurring at the same time.

The mechanics matter more than the alarm. A Maximum Generation Alert notifies transmission and generation owners to defer or cancel non-essential equipment testing and maintenance so units and transmission lines stay operational. It also warns neighboring grid operators that exports from PJM may be curtailed. PJM said the alert does not require any action from customers.

That last point is the one to hold onto. Millions of people across the region depend on the grid staying balanced during periods of elevated demand and reduced generation availability, and the sequence shows how maintenance timing, weather variability and demand-response programs interact to keep it that way.

The open questions are practical ones. The sources do not list the specific 12 other states covered by the order. The order runs through Oct.

What is clear is the timing problem. Warm fall weather pushed demand up while plants and lines were already offline for scheduled work. PJM's answer was to ask owners to put some of that work back.