; and (2) an estimate of the anticipated adverse impacts to the readiness of the Department and the financial costs to the Department during the year covered by the budget of the loss of, or damage to, military networks, systems, installations, facilities, and other assets and capabilities of the Department, including loss of or obstructed access to training ranges, as a result extreme weather events. (b) Disaggregation of impacts and costs The estimate under subsection (a)(2) shall set forth the adverse readiness impacts and financial costs under that subsection by military department, Defense Agency, and other component or element of the Department. (c) Extreme weather defined In this section, the term extreme weather means recurrent flooding, drought, desertification, wildfires, and thawing permafrost. 321. Pilot program for availability of working-capital funds for increased combat capability through energy optimization (a) In general Notwithstanding section 2208 of title 10, United States Code, the Secretary of Defense and the military departments may use a working capital fund established pursuant to that section for expenses directly related to conducting a pilot program for energy optimization initiatives described in subsection (b). (b) Energy optimization initiatives Energy optimization initiatives covered by the pilot program include the research, development, procurement, installation, and sustainment of technologies or weapons system platforms, and the manpower required to do so, that would improve the efficiency and maintainability, extend the useful life, lower maintenance costs, or provide performance enhancement of the weapon system platform or major end item. (c) Limitation on certain projects Funds may not be used pursuant to subsection (a) for— (1) any product improvement that significantly changes the performance envelope of an end item