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Celtic Energy's clients include:

Corporate

• ADT Construction Group
• Aetna Insurance
• American Continental Properties, Inc.
• CB Richard Ellis
• Conservation Services Group
• DTC Consultants
• Hartford Insurance
• Hispanic Health Council
• ISO New England
• Kerite Company
• JLMGA Consulting Engineersones Lang LaSalle
• Lutron, Inc.
• Mass Mutual Financial Group
• NCR Corporation
• SLAM Collaborative
• Savin Engineering
• Seasons Federal Credit Union
• Travelers Insurance
• UTC Pratt & Whitney
• William Beaumont Hospital

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

• Connecticut Dept. of Public Works
• Connecticut Dept. of Public Utility Control
• Connecticut Dept. of Environmental Protection
• Connecticut Judicial Department
• Connecticut Dept. of Corrections
• CT Army National Guard
• MA Dept of Capital Asset Mngmt.
• Nevada Purchasing Division
• Nevada Dept. of Human Resources
• Rhode Island Energy Office
• Rhode Island Dept. of Administration
• Rhode Island Airport Corporation
• RI Dept. of Mental Health, Retardation and Hospitals
• Town of Glastonbury, CT
• Town of West Hartford, CT
• Town of Plainville, CT
• City of Henderson, NV
• City of Reno, NV
• City of Riviera Beach, FL

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