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5mo ago

RWE to Pilot Peak Energy’s Passively Cooled Sodium-Ion Battery in Wisconsin in First MISO Deployment

The field trial will test Peak’s claim that a passive sodium‑ion design can slash lifetime storage costs by about $70 per kWh.

Peak Energy shows off its utility-scale storage solution. Courtesy: Peak Energy
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Overview

  • Peak Energy and RWE Americas signed an agreement to deploy the GS1.1 sodium‑ion system at RWE’s Eastern Wisconsin lab, with RWE operating the pilot.
  • Company materials describe the project as the first sodium‑ion battery deployment on the Midcontinent Independent System Operator grid.
  • Peak says its passively cooled system operates across a wide temperature range and removes active cooling, routine maintenance, and some capacity overbuild.
  • The company projects more than a 25% reduction in total storage-system costs versus conventional lithium‑ion at 10 GWh scale, pending field validation.
  • Aurora Energy Research estimates 10 GWh of storage on the MISO system could cut regional costs by up to $27 billion over a decade, underscoring the value of new storage options.