Pay NSTAR bills by using the payment portal on NStar.com. Unlike with many other utility companies, it is not necessary to make an account to pay as of 2015. Users need their full NSTAR account number and the ZIP code of the property for which they are paying.
NSTAR is a Massachusetts utility company that provides electricity and natural gas to customers in Boston and other areas in the eastern and central parts of the state. It was formed in 1999 from the merger of BEC Energy and Commonwealth Energy System. NSTAR has about 1.4 million residential and business customers.