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'Deep Purple' seabed hydrogen storage for offshore wind plan

Project partners hope to provide clean power supply for oil & gas platforms off Norway

A plan to convert power from offshore wind to hydrogen and store it on the seabed is underway by a multi-company project team that hopes to have a full-scale pilot running off Norway by 2025.

The project – called ‘Deep Purple’ – aims to see turbine-level electrolysis feeding seabed hydrogen tanks where output from offshore wind farms can be stored.

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Fuel cells would then re-electrify the hydrogen to provide a clean source of power for offshore oil and gas platforms, with shipping and seafood among other potential target markets for green electricity produced.

The project timeline envisages a large-scale onshore wind pilot from 2021, with a full-scale demonstrator running off Norway by the middle of the next decade.

Norwegian hydrogen specialist HYON became the latest to get involved this week when it unveiled a consulting deal with project leader TechnipFMC. “The momentum in a broad range of new and ongoing hydrogen projects is strong,” said HYON managing director Tomas Tronstad.

‘Green hydrogen’ is increasingly being seen as a key tool of the energy transition, potentially offering an large-scale option to store and transport renewable power output.

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Offshore wind sector leader Orsted recently built hydrogen production into its bid as part of the latest Dutch offshore wind tender.

With its focus on decarbonising offshore oil & gas platforms, Deep Purple mirrors initiatives such as those underway by the likes of Equinor and DNV GL to link floating wind with fossil extraction operations.

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