Cased-Wellbore Compressed Air Storage for Renewable Energy

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1 Deploy

Innovative technology as a geo-energy storage system

Page last modified
February 22 2024

The Cased-Wellbore Compressed Air Storage (CWCAS) technology is an advanced type of Compressed Air Energy Storage (CAES) process that is designed as a versatile and cost-effective renewable energy storage system. The system uses power from renewable sources to operate a compressor to compress ambient air. The high-pressure air is then stored inside a deep well(s), cased with high-grade steel. When there is a power demand, the compressed air is extracted from the well to generate power with an expander-generator.

Pros & Limitations
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Versatile energy storage easily scalable, site independent and cost-effective
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Rapidly increase the amount of reliable renewable energy in electricity supply systems
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Storage of off-peak, excess, or irregular power from renewable energy sources - to reduce congestion and curtailment
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Designed for grid, off-grid and behind-the-meter applications
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Not site-specific; it can be utilized anywhere, including near existing transmission infrastructure
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Integrates easily with solar and wind farms
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Low environmental footprint compared to other energy storage technologies, such as batteries and pumped hydro storage
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Safe and has a long life-cycle (20 – 25 years)
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Mobilization, installation, and commissioning of a CWCAS facility is relatively fast and cost-efficient
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CWCAS geo-ESS is a viable alternative to large-scale battery ESS
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The CWCAS may not be suitable under certain operational conditions for UPS (Uninterrupted Power Supply management)
Specification
Specification Title Specification Description
Areas of Application
Wind and Solar Power Facilities | Remote Communities | Power for Industry, Mines| Re-purposing of Oil & Gas fields
Capabilities
Cased-Well Drilling and Construction | System Installation | Modelling & Project Development | R & D
Depth
A well is drilled and a high-grade steel casing is cemented into the wellbore, in a rock mass to a depth of 500 to 1,500 m.
Optimisation
Energy Capital Cost: CWCAS <$350/KWh vs. Battery Storage ~ $600/KWh
Power
Storage of up to 10+ MWh per 1,000 m deep well.
Pressure class
7250+ PSI (50+ MPa)
Storage
A large well diameter is used at least 30 cm diameter casing. This provides a storage volume of 7 m3/100 m.
Temperature
200 ºC (392 ºF)

Reviews (1)

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Technology Readiness Level

[6/9]

Development Technology demonstration Mature / Proven
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CleanTech Geomechanics Inc (CTG) is a Canadian company developing innovative technologies for geo-Energy Storage Systems (geo-ESS). CTG developed the concept of Cased-Wellbore Compressed Air Storage (CWCAS) for renewable energy storage. CWCAS is an advanced Compressed Air Energy Storage (CAES) process; and is a high-pressure, low-volume CAES process. CWCAS geo-ESS enhances the versatility and application of this energy storage approach.

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