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Electrothermal Energy Storage (ETES)

Definition
Electrothermal Energy Storage (ETES) is a form of large scale energy storage that may potentially store tens to hundreds of megawatts (MW) for multiple hours.

How it works
ETES feeds electrical energy into a heat pump system and stores it in the form of heating or cooling energy in a heat/cold storage system. Electricity can be generated back through a thermal engine. Electric-to-electric round trip efficiency is estimated at approximately 60%.

Use case
ETES aims at storing grid energy produced by renewable energy resources for use within the next 24 hours. It is the ideal use case because:
 * Thermal energy storage has a limited duration (hours)
 * ETES can store tens to hundreds of MWs, enough for grid use
 * The electric-to-electric round trip efficiency of ETES is low enough (about 60%) that it can only make economic sense for very low cost energy.