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Celtic Energy's clients include:
Corporate
Federal Government
- US Department of Energy
- National Renewable Energy Laboratories
- NASA Johnson Space Center, TX
- NASA Dryden FRC, CA
- US Postal Service
- US Bureau of Prisons
- US Geological Survey
- US Internal Revenue Service
- US Army - Fort Drum, NY
- US Army- Ft Benning, GA
- US Army- Ft Jackson, SC
- US Army – Ft Polk, LA
- US Army – Ft Greely, AK
- Natick Army Labs, MA
- USAF – Edwards AFB, CA
- USAF Laughlin AFB, TX
- USAF-MacDill AFB, FL
- USAF-McGuire AFB, NJ
- USAF – Tyndall AFB, FL
- USAF/RAF Lakenheath, UK
- USAF-Wright-Patterson AFB, OH
- US Coast Guard-Cape May, NJ
- US Indian Health Service, NM
- US Navy - Sugar Grove, WV
- USMC Mobiliz. Command, MO
- US Veterans Administration, CA
- GSA – Kansas City, MO
- GSA – Cleveland, OH
State and Local Government

Educational
- University of North Carolina – Wilmington, NC
- University of North Carolina – Pembroke, NC
- Elizabeth City State University, NC
- Western Carolina University, NC
- Churchill County Schools, NV
- Clark County School District, NV
- Douglas County Schools, NV
- Washoe County Schools Reno, NV
- Longwood Central Schools, NY
- North Shore Central Schools, NY
- Norwalk Community College
-
Foster-Glocester Regional
School District, RI
- New London Schools, CT
- Windham Publics Schools, CT
- University of Connecticut
- Storrs Campus
- West Hartford Campus
- School of Law
- Torrington Campus

Utilities
- Connecticut Light & Power
- CT Municipal Electric Energy Cooperative
- National Grid USA
- NSTAR Electric & Gas, MA
- United Illuminating, CT
- Wallingford Electric, CT
- Norwich Public Utilities, CT

Other
- Inter-Religious Eco-Justice Network
- Northeast Energy Efficiency Partnership