| NSTAR is a holding company, which through its subsidiaries is engaged in the energy delivery business. The Company serves approximately 1.4 million customers in Massachusetts, including approximately 1.1 million electric distribution customers in 81 communities and approximately 300,000 natural gas distribution customers in 51 communities. The Company's operating segments or line of regulated utility businesses is electric and natural gas distribution operations that provide energy transmission and delivery services in 107 cities and towns in Massachusetts. During the year ended December 31, 2010, utility operations accounted for 99% of consolidated revenues from the Company's continuing operations. The remaining revenue is generated from its unregulated operations. Its principal subsidiaries include NSTAR Electric Company (NSTAR Electric) and NSTAR Gas Company (NSTAR Gas). |
