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A Revolution in Energy Storage

Low-cost energy storage with minimal environmental impact.

Our Solution

Leveraging nature’s strengths to provide energy storage.

How it Works

A Gravity Power plant is simple, reliable, and elegant. We dig a deep shaft, using standard technology from the mining industry. We build a piston of reinforced rock in the shaft. We add water and cap it, creating a closed loop system, with no additional water required.

Storing Energy

A conventional pump/turbine forces water down the penstock into the shaft, lifting the piston. With highly efficient hydropower equipment and low piston speed, system efficiency is high. Thousands of megawatt-hours can be stored in each plant.

Generating Power

As the piston drops, it forces water up the penstock and through the turbine, spinning the generator to produce electricity.


Gravity Power is by far the most cost-effective solution for long duration energy storage.

Gravity Power returns energy to the grid at about 4¢ per KWh, less than half the cost of lithium ion, including the cost of energy lost in the round trip. The big difference is in CapEx. Gravity Power is the only storage solution that achieves dramatic economies of scale. PNNL conducted a study to calculate the LCoE (levelized cost of energy) for 14 storage technologies, grouped into Pumped Storage Hydroelectric, Hydrogen, Flow, and Lithium Ion. The Gravity Power technology is by far the most cost-effective.
Levelized Cost of Energy

(Data for PSH, H, Flow, Li+ from Pacific Northwest National Lab. Data for GP from management.)

System benefits

Minimal Environmental Impact
  • No threats to wildlife, air, water, indigenous cultures
  • No emissions
  • No visual or noise impacts
  • Small footprint
  • No ongoing water use
Proven Technology → Innovative Configuration
  • Off-the-shelf components, widely used in hydroelectric plants globally
  • Excavation using conventional mining technology
  • Design protected by 6 patents in 24 countries

© Crossrail Ltd 2021

Flexible Installation
  • Can be built almost anywhere underground conditions are suitable
  • Co-located with renewable energy generation plants
  • Located in urban areas, where load is greatest and transmission may be limited
Local Content
  • About 80% of the cost of a Gravity Power plant is locally sourced, especially labor
  • Gravity Power plants can be sited in former coal production regions, employing the local workers' skills without retraining
Long Lifetime
  • Properly maintained, a Gravity Power plant will last for decades
  • No degradation in performance
Grid Stability
  • Gravity Power plants provide exceptional grid resources, including frequency control, fast ramping, and resource shifting into the high-value times of day

the need

Large scale, long duration storage is a critical component to successfully and rapidly build renewable power generation globally. Bloomberg New Energy Finance projects a $620B market by 2040.
Global Cumulative Storage Deployments

Alternatives are Expensive and Harmful

Denis Egan, CC BY 2.0, via Wikimedia Commons

Traditional Pumped Storage Hydro
  • Habitat destruction

  • Flooded canyons

  • 100+ dams have been removed in California alone because of environmental considerations
  • 12-15 year development cycle in targeted markets
Lithium/Chemical Batteries
  • Capacity and efficiency degrades constantly as the battery is used
  • Global supply constraints, notably of lithium
  • Disposal challenges
  • Mining negatively affects the environment and indigenous cultures
  • Not viable over the long term for large grid requirements
Other Gravity-based Solutions
  • Not suitable for long duration storage
  • Don’t scale up well
  • Visually obtrusive
  • High maintenance cost

About us

Our Mission is to deploy technology that ensures the health of our environment and communities by providing safe energy solutions with minimal environmental impact.

Gravity Power’s game-changing technology turns as-available renewable energy into reliable, peak-period power.

Gravity Power provides scalable, cost-effective, highly efficient energy storage, using existing commercial technologies, without the environmental and technical difficulties of pumped storage hydro, batteries, or other solutions.

Gravity Power will revolutionize the $1+ trillion market for energy storage. Energy is stored when the pump drives water down a deep underground shaft, raising a piston. To return energy to the grid, the piston descends with gravity, driving water through the generator. Our facilities can be built in a wide range of locations: at renewable power plants, on brownfield sites, even in cities.

Gravity Power has built a strong leadership team and advisory board, including globally recognized experts in energy markets, regulatory policies, control theory, system analysis, generation scheduling and control, power grid control, hydroelectric systems engineering, underground engineering and construction, and sealing technologies.


Jim Fiske

Chief Innovation Officer

Tom Mason

VP Engineering & Construction

Chris Grieco

Business Development: Energy and Transportation Commercial Strategy

Board of directors

Steve Taber

Chairman, Acting CEO

Robert B. Weisenmiller, Ph.D.


Tom Mason and Jim Fiske also serve on the Board. Recruitment is underway for additional Directors.


Dr. Brad Paden

Control Theory and Electromechanical Systems Design

Dr. Torbjørn Nielsen

Hydroelectric Systems Engineering

Dr. Anjan Bose

Power Grid Control

Dr. Juan I. Pérez-Díaz

System Analysis, Generation Scheduling and Control of Hydropower Plants

Bryce Yonker

Commercialization Strategy and Partner Relations

Howard Berke

Corporate Strategy

Todd Williams

Bill Gaines


Favored service provider by Utilities Stantec is one of the top 10 engineering firms worldwide and a major player in hydroelectric plants. Founded in 1954, Stantec provides professional consulting services in planning, engineering, architecture, interior design, landscape architecture, surveying, environmental sciences, project management, and project economics for infrastructure and facilities projects. The Company provides services on projects around the world through over 25,000 employees operating out of more than 400 locations on 6 continents.

EPC Partner: Underground Engineering and Construction
Leading company worldwide specializing in underground engineering. Has supported more than 200 tunnelling projects worldwide. Core area of expertise in mechanized tunneling with tunnel boring machines. Further focus are special projects requiring customized solutions and trouble shooting for TBMs in difficult situations. Spun off Tunnelsoft with TPC (Tunneling Process Control), an encompassing software to manage all tunneling related data and to allow efficient visualization and automated data evaluation.

Supplier & Seal Expertise
Leading specialist worldwide in sealing applications, serving customers in a wide variety of industries. Combines longstanding engineering and market know-how with unique material expertise. Focused is on serving our customers’ most progressive (or cutting-edge) industrial opportunities and needs. The company also works collaboratively with customers on the design and validation of custom sealing systems.

Partner with us

We work with local communities to expand employment, leverage industry skill sets, and use local content to create Gravity Power Plants.
Electric Utilities

As utilities deploy more renewable energy, Gravity Power can offer a storage solution that protects the environment, lowers cost for ratepayers, and provides local jobs.

Renewable Energy Producers

Renewable energy producers require storage to maximize market share and profitability. Most producers are moving away from chemical-based storage technologies, because of cost and environmental impacts.

Geo Engineering, Construction Firms

Builders are essential to our next-generation storage solutions. Gravity Power Plants provide a pathway to more projects, more revenue, and more contributions to their regional economies.

Government Energy Agencies

Local, state, and national governments need to set energy policies to achieve a carbon-free energy sector. We provide a path for this, while protecting the environment, keeping consumer costs low, and providing local jobs.

Contact us

We work with local communities to expand employment, leverage industry skill sets, and use local content to create Gravity Power Plants.

Let's work together.

Contact Us
* No money or other consideration is being solicited, and if sent in response, will not be accepted. No offer to buy the securities can be accepted and no part of the purchase price can be received until the offering statement is filed and only through an intermediary’s platform. An indication of interest involves no obligation or commitment of any kind. "Reserving" shares is simply an indication of interest.
945 Ward Drive, #28
Santa Barbara, CA 93101
tel +1 925 785 8825
fax +1 775 201 8500
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