Some of the generating units have operated during tight grid conditions and may have contributed to reliability. Keeping them running costs about $550 million a year, the Sierra Club says.

The Department of Energy ordered six power plants to delay their retirements last year. Two of them produced zero electricity in the first quarter in 2026, and another one is now…

Some of the generating units have operated during tight grid conditions and may have contributed to reliability. Keeping them running costs about $550 million a year, the Sierra…