Grid-scale

Voltwise acquires SMS battery storage portfolio, adding 630 MWh in the UK

Voltwise adds 460 MW / 630 MWh to its growing portfolio of battery energy storage assets

By

Tristan Rayner

Jun 24, 2025

Voltwise has acquired the battery storage division of Smart Metering Systems (SMS), taking over a portfolio of 460 MW of energy storage projects either operating or under construction in the UK. The deal closed at signing and makes Voltwise an Independent Power Producer or IPP of scale in the UK.

The purchase adds seven operational projects totalling 320 MW / 350 MWh, four sites under construction with a combined 140 MW / 280 MWh, and several development-stage assets. These projects will now sit alongside Voltwise’s existing pipeline in the UK and Germany.

Voltwise was launched by Sandbrook Capital in 2023 to develop, own and operate grid-scale battery storage projects in Europe. Before the SMS acquisition, Voltwise had already built up a development portfolio across both the UK, where it is headquartered, and Germany, with a focus on grid services. Financial details about the close were not provided.

“I am delighted that we have concluded a transaction to grow our business in alignment with our strategic ambition,” said CEO Russell Alton. “This marks an exciting moment in the evolution of our business at Voltwise, delivering a platform that is well placed to drive future expansion and profitable growth across our key jurisdictions.”

Written by

Tristan Rayner

Tristan is an Electrical Engineer with experience in consulting and public sector works in plant procurement. He has previously been Managing Editor and Founding Editor of tech and other publications in Australia.

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