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The rationale behind the UK's largest compressed air energy storage plan
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Fusion42 · 30 September 2026 · Fusion42 review
EnergyPathways is developing the UK’s largest compressed air energy storage (CAES) project, the Marram Energy Storage Hub (MESH), with 300 MW/55.2 GWh capacity in salt caverns under the East Irish Sea. The project integrates gas and hydrogen storage to support UK's energy security and aims for a final investment decision in 2028, targeting operations by 2031, pending Ofgem support and regulatory consents.
This Wire brief sits within Fusion42's coverage of Climate Tech.
◆ ◆ The Wire takeaway
UK long-duration storage founders face a growing opening as government support evolves for large-scale projects like MESH. You can target integrated storage systems combining compressed air and hydrogen to meet the delayed but maturing cap-and-floor process this year.
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1 source · 30 Sep 2026
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