The authority shall have the power to procure electric utility services, including the purchase, generation, transmission, transformation and distribution of the supplies of electricity necessary to operate its mass transportation facilities and equipment, at the lowest reasonable cost consistent with the provision of public transportation services in an efficient, reliable and economic manner. In procuring such electric utility services, the authority may solicit offers and proposals to provide such electric utility services from owners or operators, including the New England power pool, of facilities that generate, transmit, transform, or distribute electric power and energy, and shall take into consideration factors relating to the public interest, including but not limited to the following:
Mass. Gen. Laws ch. 161A, § 40