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Peak Energy and RWE Americas are piloting a sodium-ion battery energy storage system in eastern Wisconsin, which will be the first such deployment in the MISO electricity market. The project will evaluate Peak's passively cooled sodium-ion technology at an RWE laboratory facility.

This battery system uses NFPP cells, enabling operation across a wide temperature range without active cooling, thus lowering maintenance needs. The design aims to reduce the lifetime cost of stored electricity by approximately $70/kWh. The MISO region is projected to need substantial new energy storage capacity as electricity demand increases.