The US Department of Energy ordered emergency measures to protect the Mid-Atlantic grid through Friday as hot weather and planned transmission outages threaten system reliability, the department said Friday.
The order directs PJM Interconnection to dispatch specified resources and require their operation when needed to maintain reliability, while allowing backup generation as a last resort before or during an Energy Emergency Alert 3.
PJM can call on its transmission owners and electric distribution companies to carry out the order as needed, following an emergency application the grid operator submitted on Wednesday.
"Today's order will help secure reliable electricity access for millions of American families and businesses across the Mid-Atlantic by making additional power generation, including back-up power, available to use as needed," said US Secretary of Energy Chris Wright.
Wright said late summer and early fall bring fewer daylight hours, reducing solar generation and putting pressure on the grid as electricity demand rises.
"The North American Electric Reliability Corporation and others have warned of the potential dangers late summer temperature spikes can pose to the grid when leaders prematurely retire reliable power sources," Wright said.
Wright said previous energy policies have left the grid more exposed to blackouts during periods without solar or wind generation, while the current administration continues to use available measures to protect reliability.
The Energy Department estimates that over 35 gigawatts of unused backup generation remains available nationwide, while the emergency order took effect on Thursday and runs through Friday.