1. Short title This Act may be cited as the Joint Long-Term Storage Act of 2019 . 2. Purposes The purposes of this Act are— (1) to facilitate the development of long-duration energy storage technologies; (2) to increase the commercial viability of long-duration energy storage technologies; and (3) to increase the energy resilience and energy security and national security of the United States through the use of long-duration energy storage technologies. 3. Long-duration energy storage demonstration initiative (a) Definitions In this section: (1) Director of ARPA–E The term Director of ARPA–E means the Secretary of Energy, acting through the Director of the Advanced Research Projects Agency—Energy. (2) Director of ESTCP The term Director of ESTCP means the Secretary of Defense, acting through the Director of the Environmental Security Technology Certification Program of the Department of Defense. (3) Directors The term Directors means the Director of ARPA–E and the Director of ESTCP, acting jointly. (4) Initiative The term Initiative means the demonstration initiative established under subsection (b). (5) Joint Program The term Joint Program means the joint program established under subsection (f). (b) Establishment Not later than 200 days after the date of enactment of this Act, the Director of ARPA–E shall establish a demonstration initiative composed of demonstration projects focused on the development of long-duration energy storage technologies. (c) Goals The goals of the Initiative shall be— (1) to demonstrate the potential benefits of long-duration energy storage to— (A) the resilience of the electricity grid, including the security of critical infrastructure; and (B) efficient use of the electricity grid through— (i) peak load reduction; or (ii) avoided investments in traditional grid infrastructure; (2) to increase the commercial viability of long-duration energy storage technologies