Britain’s under-pressure green power industry has received a surprise fillip after a renewables developer pledged to plough £10bn into what would become the largest portfolio of battery storage projects in the country.

NatPower, a UK startup that is part of a larger European energy group, is poised to submit planning applications for three “gigaparks”, with a further 10 to follow next year.

Battery storage projects are seen as a key part of the jigsaw to decarbonise Britain’s power grid, allowing electricity generated by wind turbines and solar panels to be stored for use when weather conditions are still or not sunny.

The NatPower investment would lead to the construction of 60 gigawatt hours of battery storage, with solar and wind projects also in the pipeline

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NatPower, which plans to finance, own and in some cases operate its projects, said it had also set aside £600m to invest in new substations.

Stefano Sommadossi, the chief executive of NatPower UK, said: “To solve the bottlenecks that are slowing the shift to clean energy, we will drive investment into the grid itself, collaborating with grid operators to deliver more than 20% of the new substations required.

“By investing in substations and focusing on energy storage first, we will enable the next phase of the energy transition and bring down the cost of energy for consumers.”