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- OUC (Orlando Utilities Commission)
- Oak City Electric Dept.
- Oak Harbor Light & Water
- Oakland Press
- Oberlin, Town of
- Obion Gas System
- Ocala Electric Utility
- Ocilla Gas Dept.
- Ocmulgee Electric Membership Corp.
- Oconee Electric Membership Corp.
- Oconomowoc Utilities
- Oconto Falls Water & Light Commission
- Oglesby Utilities Dept.
- Ohio Edison Company
- Ohio Gas Co.
- Ohio Valley Gas Corp.
- Ohio Valley Gas, Inc.
- Ohop Mutual Light Co.
- Oilton Public Works Authority
- Oklahoma Gas & Electric Company
- Okolona Electric Dept.
- Olive Branch Gas System
- Olivia Light Dept.
- Olyphant Borough Light Commission
- Omaha Metropolitan Utilities District
- Omya, Inc.
- Oneonta Utilities Board
- Ontonagon County Rural Electric Associat
- Opelika Light & Power Dept.
- Opp Utility Board
- Orange & Rockland Utilities, Inc.
- Orange County R.E.M.C.
- Orange County Register
- Orcas Power & Light Co.
- Oregonian
- Orlando Sentinel
- Orleans Electric Dept.
- Ortonville Water & Light Dept.
- Osawatomie, City of
- Ottawa Utility Dept.
- Ouzinkie, City of
- Owatonna Public Utilities
- Oxford Natural Gas Co.
- Oxford Water & Light Dept.