National Grid Group plc is an international networks business. The Company's principal activities are in the regulated electricity industry, where it owns and operates the transmission network in England and Wales, and transmission and distribution networks in the northeastern United States. Its core skills lie in the design, construction, system operation, regulatory management and customer service activities associated with operating complex networks. National Grid also serves 3.2 million customers in Massachusetts, Rhode Island, New Hampshire and upstate New York. Other electricity interests include operating and developing transmission interconnectors in the United Kingdom and United States, Europe and Australia, and joint venture transmission networks in Argentina and Zambia. The Company also operates a gas distribution network, serving over 500,000 New York customers.