NSTAR is the largest Massachusetts-based investor-owned electric and gas utility. They transmit electricity and gas to more than 81 different communities. In this site you can find all the information you need to know about the company and the products and services they provide. In the Financial Assistance section you can start, transfer or stop the service, you can manage your account, read all about payment options, energy efficiency, home analyzer and customer information among others. In the Rates and Tariffs section you can get informed on the schedule of rates and a summary of rates as well about the delivery service, and you can also read about the supplier services such as basic service, competitive power supply and cost of gas. In the Safety section you can read many tips with useful advice for family safety, electric and gas safety. There are many programs and plans that you can get informed about in this site as well such as the Home Heating Protection Plans and other programs.