Peak Energy

Peak Energy is the most commercially advanced sodium-ion company in the United States and one of the most closely watched grid storage startups globally. Founded in 2023 by CEO Landon Mossburg (formerly of Northvolt North America and Tesla Energy) and co-founder Cameron Dales in Denver, Colorado, Peak Energy emerged from stealth with a $10 million seed round in 2023 before closing a $55 million Series A in 2024. Peak's defining technology choice is NFPP — sodium iron pyrophosphate phosphate — a polyanion cathode purpose-built for the specific demands of grid-scale energy storage. NFPP cells do not suffer thermal runaway, enabling Peak's signature engineering decision: a fully passive thermal management system with no fans, pumps, or active cooling. The company claims this eliminates over 85 percent of the root causes of historical battery energy storage system failures. The GS-1.1 product delivers 3.1 MWh capacity with 95 percent DC round-trip efficiency across a -40 to 55 degrees Celsius operating range. In September 2025, Peak Energy announced the operation of the first large-scale sodium-ion battery storage system in the United States. In November 2025, the company signed a contract with Jupiter Power — valued at up to $500 million — to supply up to 4.75 GWh of sodium-ion BESS for deployment between 2027 and 2030, the largest sodium-ion deal in US history. In March 2026, Peak and RWE announced the first sodium-ion battery deployment in the MISO (Midcontinent Independent System Operator) grid region. Peak has established a Battery Cell Engineering Center in Broomfield, Colorado and is targeting US cell production at a planned gigafactory commencing operations in 2026. Production targets are 5 GWh by 2028 and 50 GWh by 2032.