energy storage system
(1) Energy storage system The term “energy storage system” means any system, equipment, facility, or technology that— (A) is capable of absorbing or converting energy, storing the energy for a period of time, and dispatching the energy; and (B) (i) uses mechanical, electrochemical, thermal, electrolysis, or other processes to convert and store electric energy that was generated at an earlier time for use at a later time; (ii) uses mechanical, electrochemical, biochemical, or thermal processes to convert and store energy generated from mechanical processes that would otherwise be wasted, for delivery at a later time; or (iii) stores energy in an electric, thermal, or gaseous state for direct use for heating or cooling at a later time in a manner that avoids the need to use electricity or other fuel sources at that later time, such as a grid-enabled water heater.