Hydrostor Gigawatt Compressed Air Energy Storage

Hydrostor, a long duration energy storage solution provider, today announced the development of 1,000 MW of long duration energy storage in the state.

The California Public Utilities Commission has identified a need for up to 1,600 MW of long duration energy storage by 2026. Long duration energy storage is critical to achieving California’s decarbonization and renewable goals. Hydrostor is proud to play a critical role in the clean energy transition for the state, and looks forward to continuing to work with the Commission to establish its commercial pathway for long duration energy storage.

Hydrostor has two major projects now in active development – one in southern Kern County and one in Central California – representing a combined investment of over $1.5 billion USD, creating economic opportunities for Californians while supporting the transition to a carbon-free and renewable energy grid. Project development work including transmission interconnection, engineering and permitting activities are well underway. These are major capital projects that establish long-term clean energy infrastructure to the state using highly skilled union employment and provide significant economic benefits to the region.

A-CAES provides long duration energy storage like pumped hydro but with the key advantages of flexible siting where needed by the grid and with significantly less environmental impacts. A-CAES is much more cost effective than batteries at large scale and has a life of 50+ years making the asset ideally suited for the long duration energy market required for decarbonizing of electrical grids globally.

Hydrostor’s patented and commercially proven A-CAES technology provides 8-12+ hours of energy storage, versus the 1-4 hours that current battery technologies can feasibly provide.

It has lowest installed cost per kWh for large-scale, long-duration energy storage (100+ MW)

A-CAES in 4 simple steps

1. Compress Air Using Electricity
Off-peak or surplus electricity from the grid or a renewable source is used to run a compressor and produces heated compressed air.

2. Capture Heat in Thermal Store
Heat is extracted from the air stream and stored inside a proprietary thermal store preserving the energy for use later in the cycle. This adiabatic process increases overall efficiency and eliminates the need for fossil fuels during operation.

3. Store Compressed Air

The compressed air is stored in a purpose-built cavern where hydrostatic compensation is used to maintain the system at a constant pressure during operation.

4. Convert Compressed Air to Electricity On Demand
Hydrostatic pressure forces air to the surface where it is recombined with the stored heat and expanded through a turbine to generate electricity on demand.