ElectroSilo™ is a new, highly efficient Isothermal Compressed Air Energy Storage (ICAES) technology that offers many advantages over Lithium-Ion batteries.

The technology can operate over a wide range of energy storage capacities and power response rates making it suitable for residential, commercial, industrial, and grid-scale applications.

Our patented technology (US Patent No. US9787161B2) uses a lined vertical shaft as an underground pressure vessel/heat exchanger to enable Isothermal Compressed Air Energy Storage (ICAES) using a fixed mass of pre-pressurized air. The lining provides air tightness, while the concrete encasement interlocks with the underground formation to provide burst resistance.

Shaft depths range from 30 – 500 ft (10 – 150 m) with diameters ranging from 16 – 100 in (0.4 – 2.5m). There are two alternatives mechanisms that require prototyping, as follows:

1. Hydraulic Pump/Motor Alternative

In this Alternative, energy storage is accomplished by pu...
ElectroSilo™ is a new, highly efficient Isothermal Compressed Air Energy Storage (ICAES) technology that offers many advantages over Lithium-Ion batteries.

The technology can operate over a wide range of energy storage capacities and power response rates making it suitable for residential, commercial, industrial, and grid-scale applications.

Our patented technology (US Patent No. US9787161B2) uses a lined vertical shaft as an underground pressure vessel/heat exchanger to enable Isothermal Compressed Air Energy Storage (ICAES) using a fixed mass of pre-pressurized air. The lining provides air tightness, while the concrete encasement interlocks with the underground formation to provide burst resistance.

Shaft depths range from 30 – 500 ft (10 – 150 m) with diameters ranging from 16 – 100 in (0.4 – 2.5m). There are two alternatives mechanisms that require prototyping, as follows:

1. Hydraulic Pump/Motor Alternative

In this Alternative, energy storage is accomplished by pumping water from an adjacent water storage shaft into the pressure vessel to further compress the air inside. Energy recovery is accomplished by allowing the water is the pressure vessel to discharge via hydraulic motors that generate electricity. All hardware for this alternative is standard and readily available.

The slow rate of air compression/expansion and the large surface area of the vessel in contact with the ground result in a near-constant temperature (isothermal) process over the cycle.

2. Piston/Winch Alternative

In this Alternative, a winch-driven piston is used to further compress the pre-compressed air in the underground vessel to store and recover electrical energy.

This is a tested and tried lift mechanism commonly used in large gantry cranes deployed in ports and harbors for large loads. It is comprised of electric motors connected to the underside of a movable plug ("piston") via cables and pulleys. During charging, the electrical motors pull the cables moving the piston down to further compress the air and store energy. During discharge, the "piston" is allowed to be pushed up by the compressed air driving the motors to generate electricity.

With a maximum compressed air pressure of 5000 psi (35 MPa), the technology is capable a range of 10 kWh storage with 5 kW peak power on the low end to 25 MWh storage and 100 MW peak power on the high end, per unit
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Shahriar Eftekharzadeh
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Shahriar Eftekharzadeh CEO A highly motivated and driven engineer, environmentalist, and innovator focused on developing new technologies to help with sustainability.