; and (ii) include expected timelines for— (I) the accomplishment of relevant objectives under current programs of the Department of Energy relating to grid-scale energy storage systems; and (II) the commencement of any new initiatives within the Department of Energy relating to grid-scale energy storage systems to accomplish those objectives. (C) Updates to plan Not less frequently than once every 2 years, the Secretary shall submit to the Committee on Energy and Natural Resources of the Senate and the Committee on Science, Space, and Technology of the House of Representatives an updated strategic plan for the same 10-year period as the plan under subparagraph (A), which shall identify, and provide a justification for, any major deviation from a previous strategic plan submitted under this paragraph. (4) Research and development In carrying out the program, the Secretary shall focus research and development activities on developing cost-effective energy storage systems that— (A) (i) to balance day-scale needs, are capable of highly flexible power output for not less than 6 hours; and (ii) have a lifetime of— (I) not less than 8,000 cycles of discharge at full output; and (II) 20 years of useful-life operation; (B) (i) can provide power to the electric grid for durations of approximately 6 to 100 hours; and (ii) have a lifetime of— (I) not less than 1,500 cycles of discharge at full output; and (II) 20 years of operation; and (C) can store energy over several months and address seasonal scale variations in supply and demand. (5) Cost targets (A) In general Cost targets developed by the Secretary under paragraph (2)(B) shall— (i) be for energy storage costs across all types of energy storage technology; and (ii) include technology costs, installation costs, balance of services costs, and soft costs. (B) Target updates