 Green Mountain Power (GMP), a subsidiary of Énergir, is the largest electricity distributor in Vermont, serving over 70% of the market and near 265,000 customers.GMP's core business includes the distribution, transportation, generation, purchase and sale of electricity in Vermont and, to a lesser degree, electricity transportation in New Hampshire and electricity generation in the states of New York, Maine and Connecticut.The GMP network comprises over 2,700 km of overhead transmission lines, 16,300 km of overhead distribution lines and 2,000 km of underground distribution lines, located mainly in Vermont but also extending to New Hampshire and New York.