How hydrogen storage powers the grid
A closed-loop storage system designed to provide long duration, low-carbon electricity for the UK grid.
H₂-LDES is an integrated system combining three proven technologies:
Electrolysers
When renewable generation exceeds demand, electrolysis splits water into hydrogen and oxygen using surplus electricity.
Storage
The hydrogen is held in solution-mined underground salt caverns — each as large as St Paul’s Cathedral.
Generation
When renewables output is low, the stored hydrogen is used in hydrogen-fuelled turbines to produce electricity on demand.
This closed-loop process delivers long-duration, low-carbon electricity to the grid, creating a system capable of balancing renewables at national scale.
Our projectsWhat H₂-LDES can deliver
19 days
How long our storage can keep the lights on without wind or sun.
20 TWh
The potential reduction in wasted renewable energy with H₂-LDES.
112
Olympic swimming pools — the volume capacity of one underground salt cavern.
The future of UK energy starts here
