Sodium-Ion Battery Tested for Grid-Scale Storage in Wisconsin (electrek.co)
(Tuesday March 17, 2026 @12:00PM (EditorDavid)
from the battery-up dept.)
"A new type of battery storage is about to be deployed on the Midwestern grid for the first time," [1]reports Electrek :
> Sodium-ion battery storage manufacturer [2]Peak Energy and global energy company [3]RWE Americas will pilot a passively cooled sodium-ion battery system in eastern Wisconsin on the Midcontinent Independent System Operator network — the first sodium-ion deployment on that grid. Peak Energy says its technology is specifically designed for grid-scale storage and leverages sodium-ion chemistry's inherent stability. Unlike many lithium-ion systems, sodium-ion batteries don't require active cooling and can operate over a wide temperature range without losing performance.
>
> That simpler design could make a meaningful dent in the cost of storing electricity. According to Peak Energy, its system cuts the lifetime cost of stored energy by an average of $70 per kilowatt-hour. That's roughly half the total cost of a typical battery system today. The company says it achieves those savings by removing energy-hungry cooling systems, eliminating routine maintenance requirements, and reducing the need to overbuild storage capacity to account for battery degradation over time...
>
> If the Wisconsin pilot proves successful, it could open the door to wider adoption of sodium-ion batteries for large-scale energy storage across the US.
[1] https://electrek.co/2026/03/11/sodium-ion-batteries-hit-the-midwestern-grid-in-first-of-its-kind-pilot/
[2] https://www.peakenergy.com/
[3] https://americas.rwe.com/
> Sodium-ion battery storage manufacturer [2]Peak Energy and global energy company [3]RWE Americas will pilot a passively cooled sodium-ion battery system in eastern Wisconsin on the Midcontinent Independent System Operator network — the first sodium-ion deployment on that grid. Peak Energy says its technology is specifically designed for grid-scale storage and leverages sodium-ion chemistry's inherent stability. Unlike many lithium-ion systems, sodium-ion batteries don't require active cooling and can operate over a wide temperature range without losing performance.
>
> That simpler design could make a meaningful dent in the cost of storing electricity. According to Peak Energy, its system cuts the lifetime cost of stored energy by an average of $70 per kilowatt-hour. That's roughly half the total cost of a typical battery system today. The company says it achieves those savings by removing energy-hungry cooling systems, eliminating routine maintenance requirements, and reducing the need to overbuild storage capacity to account for battery degradation over time...
>
> If the Wisconsin pilot proves successful, it could open the door to wider adoption of sodium-ion batteries for large-scale energy storage across the US.
[1] https://electrek.co/2026/03/11/sodium-ion-batteries-hit-the-midwestern-grid-in-first-of-its-kind-pilot/
[2] https://www.peakenergy.com/
[3] https://americas.rwe.com/