ISO New England
- Not-for-profit private corporation which assumes the responsibility of managing the New England region's electric bulk power generation and transmission systems.
- http://www.iso-ne.com/

Eastern Propane and Oil
- Fuel oil and propane distributor. Residential and commercial sales, service, and installation. Serving southern Maine, southeastern New Hampshire, eastern Massachusetts, and northern Rhode Island.
- http://www.easternman.com/

Central Vermont Public Service Corp
- Provides electricity to Vermont and parts of New Hampshire.
- http://www.cvps.com/

Webber Energy Fuels
- Providing home heating fuels, service and equipment installation through out Maine and New Hampshire.
- http://www.wenergy.com/

Northeast Utilities
- An electric utility holding company that serves customers in Connecticut, western Massachusetts and New Hampshire.
- http://www.nu.com/

CLS
- An electrical and lighting supplier, serving Connecticut, Massachusetts, and New Hampshire.
- http://www.cls.com/

Cheshire Oil Company, Inc.
- Offers energy products and services to residential and commercial customers in Southern New Hampshire and Vermont. Includes heating oil delivery, burner installation, plumbing, gasoline products, and convenience stores.
- http://www.cheshireoil.com/