Constellation Energy Group
- A holding company that includes energy-related businesses focused on power marketing and merchant generation in North America. Baltimore Gas and Electric Company.
- http://www.constellation.com/

Tri Gas & Oil
- Supplier of propane gas, heating oils, diesel fuel and gasoline. Services, product details and facility locations.
- http://www.trigas-oil.com/

Carroll Independent Fuel
- Provides home heating oil, propane, diesel fuel, kerosene, lubricants and branded gasoline. Find products, services and company profile.
- http://www.carrollfuel.com/

Now You Have a Choice
- Information portal provided by the Maryland Public Service Commission on deregulation of electric utilities and choices provided to consumers. FAQs, how to choose, and contacts provided.
- http://www.md-electric-info.com/

Wills Group, The
- Parent company for several petrolium companies throughout Maryland and the Dash-In convenience store chain.
- http://www.willsgroup.com/

Northeast Maryland Waste Disposal Authority (NMWDA)
- Plans and develops waste management systems in Anne Arundel, Baltimore, Carroll, Harford, Howard and Montgomery Counties and Baltimore City.
- http://www.nmwda.org/

Baltimore Gas and Electricity
- Provides gas and electricity to Baltimore and central Maryland.
- http://www.bge.com/