New, large-scale hydrogen hub to support Denmark’s green transition

Gas Storage Denmark in collaboration with Eurowind Energy and Corre Energy is exploring the possibilities of establishing GREEN HYDROGEN HUB combining giga-watt scale electrolyser plant with underground hydrogen-based storage solutions

The project has been on the drawing board since 2014 and is named Green Hydrogen Hub Denmark (GHH). The ambition is to establish a complete PtX value chain by 2025 comprising of an electrolysis plant, hydrogen storage and a number of industrial hydrogen consumers including a Compressed-Air-Energy-Storage (CAES) facility 

GHH - diagram _press release 01-12-2020 _ 736 px 

The main purpose for GHH is to secure renewable energy irrespective of the weather. Specifically, the project is looking into the possibility of establishing a 350 MW electrolysis plant, 200,000 MWh hydrogen storage and a 320 MW Compressed Air Energy Storage (CAES) facility, which as the final link in the chain can re-convert the green hydrogen to electricity. By combining seasonal hydrogen storage and daily storage in CAES, consumers could be provided with 100% green electricity 24-7 all year. In other words, the project will be able – based on the wind and solar production – to balance an annual electricity consumption compared to that of 280,000 households. On top of that, the green hydrogen can also be applied as a sustainable fuel for the industry, heavy goods transport, shipping etc. GHH could contribute to the European green transition by potentially displacing 600,000 ton CO2 per year, which makes the project ground-breaking.

The project is currently in the investigation phase and the involved are excited about the possibilities it will bring.


Gas Storage Denmark, as a subsidiary of Energinet is already operating Denmark’s two underground gas storages and has more than 30 years’ experience with large-scale, underground storing of natural gas. This experience will be brought into the project. The outlined hydrogen storage includes a capacity of 200 GWh green electricity as hydrogen, which compares to the total battery capacity of 2 million electric vehicles.


GHH logo

If you have any questions, please visit the project’s website:

Adam Elbæk 01-12-2020_CEO Gas Storage Denmark

Adam Elbæk

CEO of Gas Storage Denmark

Our ambition is to accelerate the green transition and thereby support the development of a climate-neutral energy supply. Denmark needs to develop new solutions to reach the ambitious 2030 goals. Long-term, large-scale storage of renewable electricity in a secure and cost-efficient manner is a vital, social strategic challenge during the next decade. We believe that underground hydrogen storage can be essential in meeting that challenge, which is why this technology is the core of what GSD brings to Green Hydrogen Hub Denmark. We are collaborating with some strong partners who share the same motivation, dreams and vision, in terms of speed, scale, and direction for the green transition in Denmark. Together, we have all the competences needed for making the complex value-chain work.


Hans-Åge Nielsen

Chief Project Manager

+45 23 33 87 07


GREEN HYDROGEN HUB DENMARK currently comprises two other partners beside Gas Storage Denmark.



Eurowind Energy is a local company in Mariagerfjord Municipality that will develop the hydrogen facility to create the optimal conditions for storing wind and solar energy.


Corre Energy will be the lead developer of the hydrogen fuelled CAES facility and coordinate development across the entire project, leading key commercial and funding activities.