Lusby, MD (Nov. 27, 2023) – Constellation will conduct its semi-annual, full-volume test of the emergency warning sirens surrounding Calvert Cliffs Nuclear Power Plant on Monday, Dec. 4, at approximately noon. This is one of two semi-annual tests performed each year.

The warning siren system consists of sirens located in the 10-mile radius around the station. The sirens are not a signal to evacuate, but a warning to tune to a local Emergency Alert Broadcast television or radio station. County emergency management authorities activate the sirens.

Located in Lusby, Maryland, Calvert Cliffs Nuclear Power Plant includes two nuclear reactors that can produce up to 1,790 megawatts (MW) of zero-emissions energy, enough carbon-free electricity to power the equivalent of more than 1.3 million homes.