Contact Constellation

Call, write, or email: find full contact information for the retail energy supplier Constellation here. Call Constellation customer service at 1-877-997-9995 or find more ways to contact them below.

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Call Customer Service

Contact Constellation for any question about signing up, terms & conditions, your supply bill, your tariffs, or payments, from Monday to Friday, 8 AM – 8 PM EST:

Residential Electric 1-877-997-9995
Residential Gas 1-800-785-4373
Businesses 1-888-635-0827

Email Customer Service

To reach Constellation's customer service by email, please fill in the Contact Form.

Contact by Post

For payments Constellation-Gas
PO Box 105223
GA 30348-5223

Constellation Offices

Office Address
Massachusetts Boott Mills South
116 John Street
Lowell, MA 01852-1124
Massachusetts 116 Huntington Ave #700
Boston, MA 02116
New York 810 7th Ave #400
New York, NY 10019
Pennsylvania 1300 Virginia Dr
Fort Washington, PA 19034
Pennsylvania 2090 Greentree Rd
Pittsburgh, PA 15220-1403
Maryland 1409-A Tangier Drive
Baltimore, MD 21220
Maryland Constellation Energy Headquarters
CENG LLC Headquarters, and Sales Office
100 Constellation Way
Baltimore, MD 21202
Michigan 3060 Commerce Dr #4
Fort Gratiot Township, MI 48059
Ohio 8405 Pulsar Place
Columbus, OH 43240
Kentucky 9960 Corporate Campus Dr #2000
Louisville, KY 40223
Tennessee 611 Commerce St #3109
Nashville, TN 37203
Illinois 550 W. Washington Boulevard, Suite 300
Chicago, IL 60661
Illinois 100 N Lincolnway
North Aurora, IL 60542
Wisconsin Park Ridge Center II
N21 W23340 Ridgeview Parkway
Suite B
Waukesha, WI 53188
Arkansas 350 Salem Rd #6a
Conway, AR 72034
Nebraska 12120 Port Grace Blvd
La Vista, NE 68128
Oklahoma 8801 S Yale Ave #402
Tulsa, OK 74137
Texas 325 North. St. Paul Street
Dallas, TX 75201
Texas 1221 Lamar St #750
Houston, TX 77010
California 350 S Grand Ave #3800
Los Angeles, CA 90071
California 50 Oak Ct
Danville, CA 94526
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