The cast iron energy storage project encompasses 1. innovative material use, and 5. potential applications in various sectors. The. Sensible heat storage with cast iron. Clad metal chosen for corrosion resistance to primary or secondary reactor coolant (sodium, salt, lead or helium) Project Adele system, laboratory section of prestress pressure vessel and schematic of the pressure vessel. Courtesy of General Electric, RWE AG. SACRAMENTO — The California Energy Commission (CEC) today approved a $30 million grant to Form Energy to build a long-duration energy storage project that will continuously discharge to the grid for an unprecedented 100 hours. The company plans to build a 5 MW/500 MWh iron-air battery storage. Pipelines and storage provide essential infrastructure to get H2 to where it is used and buffer between variable generation and steady state end use. The DOE Industrial Decarbonization Roadmap discusses the important role H2 plays in decarbonizing iron and steel.