Energy storage system means a system which stores energy and releases it in the same form as was input.
energy storage means, in the electricity system, deferring the final use of electricity to a moment later than when it was generated, or the conversion of electrical energy into a form of energy which can be stored, the storing of such energy, and the subsequent reconversion of such energy into electrical energy or use as another energy carrier;
Rechargeable Electrical Energy Storage System (REESS) means the rechargeable energy storage system that provides electric energy for electrical propulsion.
Energy Storage Resource means a resource capable of receiving electric energy from the grid and storing it for later injection to the grid that participates in the PJM Energy, Capacity and/or Ancillary Services markets as a Market Participant.
Renewable Energy Source means an energy source that is not fossil carbon-based, non- renewable or radioactive, and may include solar, wind, biomass, geothermal, landfill gas, or wave, tidal and thermal ocean technologies, and includes a Certified Renewable Energy Source.