Calvert Cliffs Emergency Siren Test Scheduled for June 2

Sirens to sound for three minutes at 12 p.m.

Lusby, MD (May 27, 2025) – Constellation will conduct its semi-annual, full-volume test of the emergency warning sirens surrounding Calvert Cliffs Clean Energy Center on Monday, June 2, 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 Clean Energy Center includes two nuclear reactors that can produce enough carbon-free electricity to power the equivalent of more than 1.3 million homes.

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About Constellation

Constellation Energy Corporation (Nasdaq: CEG), a Fortune 200 company headquartered in Baltimore, is the nation’s largest producer of reliable, emissions-free energy and a leading energy supplier to businesses, homes and public sector customers nationwide, including three-fourths of Fortune 100 companies.

With annual output that is nearly 90% carbon- free, our hydro, wind and solar facilities paired with the nation’s largest nuclear fleet have the generating capacity to power the equivalent of 16 million homes, providing about 10% of the nation’s clean energy. We are committed to investing in innovative technologies to drive the transition to a reliable, sustainable and secure energy future. Follow
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Contact: Mark Rodgers

Senior Communications Manager
Mark.Rodgers@Constellation.com

FOR IMMEDIATE RELEASE