Insider Engineering Solutions

Fabrication continues on Gravitricity’s energy storage demonstrator

6 min read - published on August 31th, 2020


The production of lifting equipment for the British company Gravitricity is in full swing a its completion in our plant is planned for December. At the same time the 250kW demonstrator's lattice tower is being fabricated by Leicester engineering specialists Kelvin Power.

The full 16m-high rig will then be assembled at a grid-connected site at the port of Leith for testing to begin in spring 2021.



Gravity electricity storage system

Commenting on the project, Gravitricity Lead Engineer Miles Franklin said: 

“Our demonstrator will use two 25-tonnes weights suspended by steel cables. In one test we’ll drop the weights together to generate full power and verify our speed of response. We calculate we can go from zero to full power in less than a second – which can be extremely valuable in the frequency response and back-up power markets.

We’ll then run tests with the two single weights, dropping one after the other to verify smooth energy output over a longer period, alongside a programme of other tests to demonstrate and refine the full capabilities of the system. This two-month test programme will confirm our modelling and give us valuable data for our first full-scale 4MW project which will commence in 2021.

Huisman are global experts in winches and control systems and it is great to have them as strategic partner for this project and our full-scale system.”

Pepijn Toornstra from Huisman said:

“We are extremely pleased to have received from Gravitricity this project to build a unique energy storage system. It is an excellent addition to our current production portfolio and we hope that it will be a long-term success for both our companies and our contribution to the renewable energy market, the growing importance of which we are convinced.”

Gravitricity’s energy battery works by raising multiple heavy weights – totalling up to 12,000 tonnes – in a deep shaft and releasing them when energy is required. The prototype of the innovative gravity electricity storage system can be roll out in disused shafts worldwide.

The project is supported by a £640,000 grant from UK Government funder Innovate UK.


See a short (30 second) explainer animation here.

See a longer (4 minute) explainer animation here.

Picture of Huisman Manufacturing
August 31th, 2020

Huisman Manufacturing

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