T1 Energy Emerges as FREYR Battery Rebrands to Support U.S. Expansion FREYR Battery has rebranded as T1 Energy, reflecting its focus on U.S. solar and battery manufacturing. The company, now headquartered in Austin, Texas, is ramping up production at its Wilmer, Texas facility and plans to start construction on a new solar cell plant later this year, reinforcing domestic energy supply chains.12