High Quality Content by WIKIPEDIA articles! NSTAR is a utility company that provides retail electricity and natural gas to customers in eastern and central Massachusetts, including the Boston urban area. NSTAR was formed in 1999 by the merger of BEC Energy and Commonwealth Energy System. NSTAR currently has the following operating units: Boston Edison Company, Cambridge Electric Light Company, Commonwealth Electric Company, and NSTAR Gas Company (formerly Commonwealth Gas and Cambridge Gas Company). As a part of deregulation of the local electrical power industry, NSTAR has divested itself of all electric generation facilities, keeping only those elements of the business which remain regulated. NSTAR has ownership of unregulated district energy and telecommunications businesses including Medical Area Total Energy Plant, Inc. which produces electricity, steam and chilled water for sale to customers in the Longwood Medical Area of Boston.

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