Advanced Compressed Air Energy Storage
A Unique Grid Storage Solution
How A-CAES works
A-CAES is unique as a grid storage solution: it provides long-duration storage like pumped hydro, but has the key advantage of being able to be flexibly sited where the grid needs it, allowing the targeting of high-value (and immediately available) grid applications like transmission deferral and fossil plant replacement. The technology operates very similarly to a gas plant but is entirely non-emitting, is much more cost-effective than batteries at scale with a 50+-year asset life and is ideally suited to providing the long-duration storage resource necessary for decarbonizing the grid.
A-CAES represents an important paradigm shift in “conventional” CAES technology, improving upon it through two primary innovations: a proprietary thermal management system and the use of purpose-built hard-rock air-storage caverns, enabling emission-free operation and siting flexibility.
Capture Heat in Thermal Store 2
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.
Convert Compressed Air to Electricity On Demand 4
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.