Advanced Compressed Air Energy Storage

Unleash the power below

Project Applications

Reserve / Peaking Power Plants

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

Emission free peaking power

On-Demand Renewable Energy Plants

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

Lower cost power than diesel

Renewable engergy on demand for power applications

Baseload or peaking plant designs

Replacement of fuel shipments, oil storage, and aged infrastructure

Islands / Mines / Micro-grids 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

Coastal Wind / 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


Hydrostor Inc. has developed an energy storage solution that addresses intermittent renewable generation (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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Hydrostor Reference Facility

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Contracting details

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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.


Utility scale

2 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

Adiabatic Process

Emission-free (no fossil fuel) operation

Maximum flexibility

From decoupled charge rating, discharge rating, storage capacity

Low cost

Half the cost of competing battery solutions with more than double cycle life

Roundtrip AC/AC efficiency

From 60% to 80% or higher

Air Storage Options

Underwater accumulator or underground geological formation

Expandable storage capacity

Excellent reliability

Black start & voltage support

Unlimited cycles

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

Current Projects


Project Name Location Power Rating Storage Capacity Customer Utility Host Status
Toronto Island Toronto, Canada 0.7MW Phased expansion to multi-MWh Toronto Hydro In-service Nov-2015
Goderich Goderich, Canada 1.75MW 7MWh NRStor (to IESO) Under construction
Vader Piet Aruba 1MW 6MWh WEB Aruba N.V. Contracted

Hydrostor's CAES Reference Facility

Toronto Island, Canada. Utility Host: Toronto Hydro




Financial Support

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

Curtis VanWalleghem

MBA, B.Eng, PMP; President & Chief Executive Officer, Board Member

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

Founder & Chief Technology Officer

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 advisor 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 and holds the ICD.D Designation from the Institute of Corporate Directors.

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: Kick the Fossil Fuel Habit (early 2010) and Walking the Frog (Fall 2014). 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.

Curtis D. Bartlett

Board Member

Mr. Bartlett is a founding Partner of Lorem Partners. He has over 30 years of experience as an entrepreneur and manager, private equity investor and investment banker. Mr. Bartlett is currently a founding director of Parex Resources Inc., a TSX listed oil company based in Calgary with operations in Colombia, which has grown from a start-up to over $2 billion of market capitalization. He is also a founding director of Gravity Renewables, Inc. a private Boulder based company focused on consolidating small hydro power facilities in the United States. Mr. Bartlett has been involved in the start-up, growth and sale of more than a dozen companies in the energy sector. He graduated with a Bachelor of Arts (Honours) degree from Queen’s University, and received a Master of Arts degree from the University of Toronto. Mr. Bartlett served as a Trustee of Queen’s University, and holds the ICD.D from the Institute of Corporate Directors.

Ron Miller

Board Member

Mr. Miller was a co-founder of MHI Energy Partners (2001), a private equity investment firm which then rebranded itself Lorem Partners in 2012. Mr. Miller has extensive experience in strategic and corporate finance matters for both privately held and publicly traded entities including originating, valuing, structuring and negotiating acquisitions, dispositions, and, conventional and non-conventional financings. Mr. Miller is currently a board member of Parex Resources Inc., Rhino Legal Finance Inc., Redress Risk Management Inc., and JDRF Canada; he is also a board observer of Gravity Renewables, Inc.

Mr. Miller holds a Bachelor of Commerce degree (1987) from the University of Alberta and has also obtained his Chartered Professional Accountant (1990) and his ICD.D (2009) designations.


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Hydrostor Inc.
82 Richmond St East, Suite 400,
Toronto, Ontario, Canada
M5C 1P1

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(416) 548-7880
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