Iberdrola USA, which became part of the group in September 2008, distributes electricity and gas to 2.44 million customers in the states of Maine and New York. It has offices located in its principal distribution centres in the two states. In New York, the business is shared by two operating subsidiaries – New York State Electric & Gas (NYSEG) and Rochester Gas and Electric (RG&E)– both headquartered in Rochester. In Maine, Central Maine Power (CMP) has headquarters in Augusta. NYSEG serves 878,000 electricity customers and 261,000 natural gas customers across more than 40% of upstate New York, whereas RG&E serves 367,000 electricity customers and 303,000 natural gas customers in nine counties around the city of Rochester. CMP is the largest energy supplier in Maine, serving over 600,000 customers.