Peak Energy says it will deploy the first sodium-ion battery in the Midcontinent Independent System Operator (MISO) service area with RWE Americas in eastern Wisconsin, using passively cooled grid-scale storage that cuts auxiliary power use by 90% and lowers lifetime storage costs by $70/kWh. March 13, 2026 Phoebe Skok Image: Peak Energy From ESS News The Midcontinent Independent System Operator (MISO) will receive its first sodium-ion battery thanks to a dual pilot project from battery company�...