Underwater Compressed Air Energy Storage

Unleash the power below


Hydrostor Inc. has developed an energy storage solution that addresses intermittent (solar & wind), load balancing, reserve capacity, and peak-shaving.

True bulk energy storage that addresses the issues of renewable intermittency, grid load balancing, reserve capacity, and peak shaving. Utilizing state of the art mechanical and electrical components from some of the world's leading manufacturers, our clients receive the comfort and peace of mind that the Hydrostor system will perform admirably for the life of the equipment and is backed by a global service network.

Our projects use drilling systems that minimize environmental disturbance and nearly eliminate the need for off-shore construction, as well as a thermal management system allowing superior capture of heat, driving our efficiency even higher. Hydrostatic pressure naturally created by water depth makes the Hydrostor Solution of the cleanest, most economical energy storage solutions available today.

How does it work?

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UCAES reference facility

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Contracting details

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Get more info and pricing details Get in Touch

How it works

Hydrostor's energy storage solution

1. Convert Electricity to Air
Electricity runs an air compressor which converts the electrical energy into compressed air.
2. Thermal Management
Heat from compression is captured during this step and stored to be used during generation, thus increasing the system efficiency. Additional heat can be added to further increase roundtrip efficiency.
3. Pressurize Air
The compressed air stream is pressurized to the same pressure found at depth where the accumulators are located.
4. Store Air in Accumulators
The air displaces the water in the accumulators and is held until electricity is needed by the consumer.
5. Reverse the Air Flow
To satisfy the need for electricity the system reverses the air flow allowing the weight of the water to force the air back to surface under pressure.
6. Convert Air to Electricity
The stored heat is added back into the air stream. The heated air travels to an expander which drives a generator efficiently converting the energy in the air back into electricity for the consumer.
Press Release November 18th, 2015 DOWNLOAD PDF

Hydrostor's Underwater CAES Reference Facility

Toronto Island, Canada. Utility Host: Toronto Hydro


Utility scale

5 MW and up | 30 MWh and up

Green energy on-demand

Chemical free & environmentally friendly

Long life

30+ years without efficiency loss

Proven components

Manufactured by top global suppliers

Fast build

Less than 2 year project lead-time

Maximum flexibility

From decoupled charge rating, discharge rating, storage capacity

Low cost

Roundtrip AC/AC efficiency

From 60% to 80% or higher

Black start & voltage support

Expandable storage capacity

Excellent reliability

Unlimited cycles

Project Applications

I. Islands Committed to Fossil Fuel Independence

Lower rates through replacement of diesel generation with Renewables and Storage

Back-up power, black start, and voltage support for grid management and emergency situations

Enable renewable energy production up to 100% of capacity

Increase distributed renewable generation with central storage resource for optimized grid and asset management

Load levelling through storage of surplus renewables (e.g. curtailed wind or solar) for discharge during peak demand; reducing maintenance and increasing performance of fossil generators

II. Coastal Wind and Solar Projects

Time shift generation to maximum project economics and plant utilization

Eliminate renewable curtailment

Increase project size to allow continued generation even without sun or wind

Provide 24 hour voltage support and black start capabilities

III. On-Demand Renewable Energy Generation Plants

Combined installation of wind or solar generation with storage to supply 100% green electricity

Lower cost power than diesel

Renewable power on demand for power requirements

Baseload or peaking plant designs

Replacement of fuel shipments, oil storage, and aged communications

IV. Reserve / Peaking Power in Costal Cities

Urban storage systems offering peak shaving and reserve capacity for utilities and grid operators

Eliminate renewable curtailment

Environmentally clean solution for city located peaking plant

Provide 24 hour voltage support, black start, and power quality conditioning

Complete Solution

Hydrostor provides turn-key projects including maintenance and operation services — the customer just needs to signal to Hydrostor how much power to produce (or store) and when.

Fully financed solutions
Full lifetime warranty
Sized to meet clients varying requirements
Operations and maintenance services
Single contract option
Do you have a project in mind? Request info & Pricing

Hydrostor has a proprietary Underwater Compressed Air Energy Storage (UCAES) solution that addresses intermittent renewable generation (solar, wind), reserve capacity, peak shaving. The company offers a complete solution including financing for island nations, renewable project developers, utilities, and coastal cities.

Curtis VanWalleghem

MBA, B.Eng, PMP; Chief Executive Officer

Curtis joined Hydrostor in 2010 to lead commercialization of their underwater compressed air energy storage solution. Prior to Hydrostor, he was Sr. Manger in Deloitte's Corporate Strategy Consulting Practice where he advised and consulted for some of the top energy companies globally. He has also held positions at nuclear generator Bruce Power, wind developer Environmental Electric Company, electronic manufacturer Celestica Inc., and the financial services firm CIBC.

Cameron Lewis

President and Founder

With nearly 15 years of manufacturing experience of oil-field production equipment in Alberta, Mr. Lewis has worked directly with all types of process equipment meeting all types of needs both domestic and abroad. He has prior experience with a number of start-ups including Delaney Energy Manufacturing, Chadco Canada, Armadillo Card Company, and most recently Environmental Electric Company, developing wind farms in Ontario.

Andrew McGillis

M.Sc., P.Eng.; VP Engineering & Projects

Mr. McGillis is a coastal and marine engineer. He has more than 10 years of experience working as an engineer in the marine sector, including project management, coastal process investigations, and design. Most of his past work involves site investigations and engineering design of marine structures such as revetments, breakwaters, harbours, offshore wind turbine foundations, and scour protection. He is now focussed on managing the design and engineering process at Hydrostor.

Ray Boland

Chairman of the Board

Ray is a corporate advisory who has been engaged at the CEO and COO level to implement corporate change and effect business transitions, particularly to small and medium sized corporations. He is also a senior advisor with the MaRS Discovery District, where he advises on the commercialization of innovation and provides ongoing support for a number of early-stage companies. Previously, he was a Managing Director of Corporate and Investment banking with RBC Capital Markets in New York, and was also head of the Chicago based RBC Global Automotive Business. Born in Dublin, Ray has studied international relations and economics and has a MBA from Trinity College Dublin in addition to being a graduate of the University of Toronto's Directors Education Program at the Rotman School of Management.

Robert “Bud” McFarlane

Board Advisor

Honorable Robert “Bud” McFarlane has had a distinguished record of public service including ten years in the White House and State Department serving variously as Military Advisor to Henry Kissinger and Brent Scowcroft, Counselor to the Secretary of State and rising ultimately to serve President Reagan as his National Security Advisor. He is perhaps best remembered as the architect of the comprehensive set of U.S. policies — including most notably the Strategic Defense Initiative (or Star Wars) — which so stressed the Soviet economy as to bring it down and in the process accelerated the collapse of Marxism in the former Soviet Union. He is a graduate of the US Naval Academy, served in the US Marine Corps (where he commanded an artillery battery in the first landing of American forces in Vietnam), holds a Master of Science from the Graduate Institute of International Studies in Geneva, Switzerland, and was selected as a White House Fellow.

Murray McCaig

Board Member

Murray is the managing director at the MaRS Cleantech Fund, Canada's leading early stage investor in clean technology sector. Previous to this, Murray managed New York based private equity group, RSL Investments (owned by the Estee Lauder family), where he was responsible for leading a global business acquisition strategy in the water sector. As an entrepreneur, Murray founded and built two successful venture capital backed startups, an innovative in-building wireless provider, Spotnik Mobile, which he sold to TELUS (one of Canada's major telecom operators) and EnviroTower, a well-known Cleantech company in the water treatment sector. Murray raised over $25 million in early stage capital for these ventures. Prior to this, Murray was a principal with the McKenna Group, a Silicon Valley-based management consulting group, where he developed and implemented growth strategies for large global technology companies and early stage ventures. Murray holds an MBA from the University of Western Ontario and is a former Olympian who represented Canada at the 1992 Games.

Tom Rand

Board Member

After a number of years as a successful software entrepreneur Tom now focuses his efforts on carbon mitigation. He's active in Cleantech venture capital, technology incubation & commercialization, and public advocacy. Tom is Managing Partner of the privately-backed MaRS Cleantech Fund, a Senior Advisor at the MaRS Discovery District and sits on the board of a number of clean energy companies and organizations. Tom has two books under publication: fKick the Fossil Fuel Habit (early 2010) and (working title) Hot Water (Fall 2013). Tom holds a BSc in electrical engineering (U of Waterloo), an MSc in philosophy of science (University of London and LSE) and an MA and PhD in philosophy (U of Toronto) and is an Action Canada Fellow.

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