Each Storage Boiler System is comprised of three sub-system packages:

Heat Cell – Blocks of Caldera's patented thermal storage material are enclosed in a vacuum-insulated chamber, and heated directly by electricity from the grid or on-site renewables. Thermal energy is extracted on demand by injecting controlled amounts of pure water into coils embedded in the storage material, which produces steam. Steam can be delivered directly from electricity or from stored heat.

Steam Generator – A standard packaged heat exchanger uses the steam generated from the Heat Cell to heat feedwater from the site hotwell, in turn generating steam to be fed into the site’s header. Delivery pressure is up to 16 bar. Outputs to hot water, hot air or thermal oil are also available.

Compact Substation – A ready-to-install package, which is factory-assembled, takes power from the site's MV ring main and manages the loads to the Heat Cell. It houses MV switchgear, transformer and LV switchgear.

The system is modular and configurable with an ability to include as many Heat Cells as required, and adjustable for site network, charging and discharging requirements.