Sodium-ion Batteries Hit the Midwestern Grid in First-of-Its-Kind Pilot

Grid StorageBatteriesLong-Term Energy Storage

A new type of battery storage is about to be deployed on the Midwestern grid for the first time, marking a significant step towards a more sustainable energy future.

TL;DR
• Peak Energy and RWE Americas are piloting sodium-ion battery storage on the Midwestern grid.
• This technology reduces energy storage costs by an average of $70 per kilowatt-hour.
• Sodium-ion batteries can operate over a wide temperature range without losing performance.

Summary
The Midwestern grid is set to host its first sodium-ion battery storage pilot, a collaboration between Peak Energy and RWE Americas. The passively cooled sodium-ion battery system will be deployed in eastern Wisconsin on the Midcontinent Independent System Operator (MISO) network. This technology is designed for grid-scale storage, leveraging sodium-ion chemistry's inherent stability, and does not require active cooling, allowing it to operate over a wide temperature range without losing performance.

Key benefits of this technology include a reduction in the lifetime cost of stored energy by an average of $70 per kilowatt-hour, roughly half the total cost of a typical battery system today. The savings are achieved 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.

The pilot aims to test how the technology performs on the grid, with RWE Americas, which operates about 13 gigawatts of energy assets in the US, running the project. The MISO region, which includes Wisconsin and much of the Midwest, is seeing electricity demand surge while energy costs rise and grid-scale storage remains limited. Installing 10 GWh of battery storage capacity in the MISO region over the next decade could cut system costs by as much as $27 billion.

The use of Peak's GS1.1 sodium-ion systems for that capacity would lower total storage system costs by more than 25% compared with conventional lithium-ion batteries. 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.

As the world transitions to renewable energy, innovative technologies like sodium-ion batteries will play a crucial role in ensuring a reliable and sustainable energy future.