1. Short title This Act may be cited as the North American Development Bank Improvement Act of 2017 . 2. General capital increase Part 2 of subtitle D of title V of Public Law 103–182 ( 22 U.S.C. 290m et seq.) is amended by adding at the end the following: 547. First capital increase (a) Subscription authorized The Secretary of the Treasury is authorized to subscribe on behalf of the United States to, and make payment for, 150,000 additional shares of the capital stock of the Bank. (b) Limitation Any subscription by the United States to the capital stock of the Bank shall be effective only to such extent and in such amounts as are provided in advance in appropriations Acts. . 3. Policy goals (a) In general In addition to projects within the mission and scope of the North American Development Bank on the day before the date of the enactment of this Act and pursuant to section 2 of article II of the Charter, the Secretary of the Treasury shall direct the representatives of the United States to the Board of Directors of the Bank to use the voice and vote of the United States to support the financing of projects related to— (1) environmental infrastructure relating to water pollution, wastewater treatment, water conservation, municipal solid waste, and related matters; (2) natural gas, including natural gas pipelines and combined cycle power plants, with major emphasis on cross-border energy distribution and consumption and the energy security of the United States and Mexico