HT-CAES TECHNOLOGY

Sigma Energy Storage’s HT-CAES technology turns wasted energy into non-emitting, dispatchable power.

It’s a straightforward concept:


Electricity powers air compressors.
Electricity from any source (solar, wind, tidal, nuclear, even excess diesel) can enter the HT-CAES system to be stored for use at the optimal time. The time it takes to store can be customized by adding compression capacity.


THERMAL EXCHANGER



Energy is stored in two forms: potential mechanical energy (compressed air) and thermal energy (hot thermal fluid). The size of the vessel determines the amount of energy stored.
Compressed air can be stored in tanks (above-ground containerized HT-CAES) or in natural megavessels such as salt domes or rock pools (underground HT-CAES).


TURBINE


AIR COMPRESSOR



The friction of air compression transforms some of the input energy into heat. Hot compressed air circulates in thermal exchangers.
In the heat exchangers, heat is absorbed and stored in a thermal fluid developed by Sigma Energy Storage


COMPRESSED AIR & THERMAL FLUID



Compressed air is released, warmed with stored heat, and used to drive a multi-stage turbo-expander.
HT-CAES technology transforms intermittent energy sources into dispatchable power. The turbo-expander controls the power capacity of the system – it is scalable to the appropriate capacity for each project.

AIR COMPRESSOR



Electricity powers air compressors.
Electricity from any source (solar, wind, tidal, nuclear, even excess diesel) can enter the HT-CAES system to be stored for use at the optimal time. The time it takes to store can be customized by adding compression capacity.

THERMAL EXCHANGER



Hot compressed air circulates in thermal exchangers.
When air is compressed to high pressures, up to 50% of the input energy transforms into heat. Proprietary Sigma Thermal Fluid quickly absorbs this heat and stores it for use at regeneration.

COMPRESSED AIR & THERMAL FLUID



Energy is stored in two forms: compressed air and heat.
Compressed air can be stored in tanks (above-ground containerized HT-CAES) or in natural megavessels such as salt domes or rock pools (underground HT-CAES). The size of the vessel determines the amount of energy stored.

TURBINE



Compressed air is released, warmed with stored heat, and used to drive a multi-stage turbo-expander.
HT-CAES technology transforms intermittent energy sources into dispatchable power. The turbo-expander controls the power capacity of the system – it is scalable to the appropriate capacity for each project.

This highly scalable technology can be CONTAINERIZED, for above-ground, micro-grid scale applications, or UNDERGROUND, for utility-scale projects.

Get in touch with us to learn more.