; and (B) which owns, leases, or operates, or will own, lease, or operate, the project in whole or in part, and at least one of the participants in the entity is a nongovernmental entity. (24) Revolving fund The term revolving fund means a fund or program established by a State or a political subdivision or other instrumentality of a State, the principal activity of which is to make loans, commitments, or other financial accommodation available for the development of one or more categories of infrastructure projects. (25) Secretary The term Secretary means the Secretary of the Treasury or the designee of the Secretary. (26) Smart grid The term smart grid means a system that provides for any of the smart grid functions set forth in section 1306(d) of the Energy Independence and Security Act of 2007 ( 42 U.S.C. 17386(d) ). (27) State The term State includes the District of Columbia, Puerto Rico, Guam, American Samoa, the Virgin Islands, the Commonwealth of Northern Mariana Islands, and any other territory of the United States. (28) Telecommunications infrastructure project The term telecommunications infrastructure project means any project involving infrastructure required to provide communications by wire or radio. (29) Transportation infrastructure project The term transportation infrastructure project means any project for the construction, maintenance, or enhancement of highways, roads, bridges, transit and intermodal systems, inland waterways, commercial ports, airports, high speed rail and freight rail systems. 4. Establishment of national infrastructure development bank (a) Establishment of national infrastructure development bank The National Infrastructure Development Bank is established as a wholly owned Government corporation subject to chapter 91 of title 31, United States Code (commonly known as the Government Corporation Control Act ), except as otherwise provided in this Act. (b) Responsibility of the secretary The Secretary shall take such action as may be necessary to assist in implementing the