Northeast Utilities is a publicly traded, Fortune 500 energy company headquartered in Berlin, Connecticut, with several regulated subsidiaries offering retail electricity and natural gas service to more than 2.1 million customers in New England. NU is New England's largest public utility, with more than 3,140 circuit miles of electric transmission lines, 32,802 pole miles of distribution lines throughout the region, and a natural gas distribution system encompassing 2,088 square miles in Connecticut. NU was formed on July 1, 1966, with the merger of Connecticut Light and Power Company ,... Western Massachusetts Electric Company , and The Hartford Electric Light Company under a single parent company, creating the first new multi-state public utility holding company since the enactment of the Public Utility Holding Company Act of 1935. In 1967, Holyoke Water Power Company joined the NU System, followed by the Public Service Company of New Hampshire in 1992. In October 2010, Northeast Utilities announced that it would merge with NSTAR, with the resulting company retaining the Northeast Utilities name.
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| NYSE symbol: | NU |
| Founded: | 1966 |
| Headquarters: | Berlin, Connecticut |
| Annual revenue: | $5,800,100,000 |
| Operating income: | $437,500,000 |
| Market cap: | $4,900,000,000 |
| Industries: | Electric Services |