Maine Public Utilities Commission
- Regulates water, electricity, gas, and telephone utilities for Maine.
- http://www.maine.gov/mpuc/

Competitive Energy Services
- Helps businesses in Maine save money on their electricity costs. Company licensed by the Maine Public Utilities Commission.
- http://www.energymaine.com/

TDS Telecommunications
- Independent telephone company in Maine. Company serves rural and suburban communities.
- http://www.tdstelecom.com/

Maine Yankee
- Nuclear power plant that once was the state's largest single generator of electricity. Maine Yankee is now in the process of being decommissioned and officially is shut down.
- http://www.maineyankee.com/

Bangor Hydro Electric Company
- Providing electrical service and support in the greater Bangor area.
- http://www.bhe.com/

Central Maine Power Company
- Serves electric customers by providing over 9 billion kilowatt-hours of energy a year. Offers other services through its affiliates, such as telecommunications, consulting, and utility services that cross state and national boundaries.
- http://www.cmpco.com/