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DOE Awards $2 million for Development of 100-hour Grid Energy Storage

The Energy Department has awarded $2 million to researchers at Michigan State University, Arizona State University, Dresser-Rand, and Saudi Aramco Energy Ventures to develop a next-generation design for long-duration storage on the U.S. power grid.

The award was created by DOE's Advanced Research Projects Agency-Energy (ARPA-E) as part of the Duration Addition of electricitY Storage, or DAYS, program. 

The funded project is called Scalable Thermochemical Option for Renewable Energy Storage, or STORES. As part of their work, the project team will develop energy storage systems to power the electric grid for durations for up to 100 hours. DAYS projects seek to exploit opportunities for tradeoffs that keep costs low in electrochemical, thermal, and mechanical systems.

The STORES team will develop a modular thermal storage system that uses electricity from sources like wind and solar power to heat up a bed of magnesium manganese oxide particles to high temperatures. Once heated, the bed will release oxygen and store the heat energy in the form of chemical energy.

When additional power is needed, the system will pass air over the particle bed starting a chemical reaction that releases heat to drive a gas turbine generator. The low cost of magnesium and manganese oxide are expected to help to keep the system cost competitive.

DOE says that most energy storage systems deliver power over a limited time to alleviate congestion, stabilize grid frequency and voltage, or provide intraday shifting services. The extended discharge times that are the goal of DAYS projects are expected to enable a new set of applications for grid storage, including long-lasting backup power and greater integration of renewable energy resources.


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