Influencing the Priorities of Horizon Europe
Going for 100% renewable energy will not work without energy storage where surplus electricity is used to produce hydrogen by electrolysis. Underground hydrogen storage offers us the possibility for storing energy in the subsurface at a very large scale.
To decrease emissions of greenhouse gasses into the atmosphere, we have to move away from fossil fuels into a green and sustainable society. Hydrogen can play a big role in this, as it is a universal energy carrier and can be used to fuel cars or ships, heat buildings, melt steel or make electricity. When it burns mostly water comes out.
For this transition, we will need a lot of hydrogen throughout the year. But where can we store all this hydrogen during the summer days when we do not need as much? Underground hydrogen storage, or UHS as it`s called for short, offers us the possibility for storing energy in the subsurface at a very large scale.
For Norway, UHS is a big opportunity to use existing know-how and infrastructures from the oil and gas industry and move into a green future, protecting jobs and our environment!
In this text we will explain what UHS is and put a light on some of our major research goals on the topic.
UHS is a concept for large-scale energy storage where excess hydrogen is pumped and stored in different deep geological formations. Salt caverns, aquifers and depleted hydrocarbon deposits (gas reservoirs) in the North Sea can be used for this type of storage. There the hydrogen can stay for days, weeks or months, until it is needed. When it is pumped back, it can be either directly used or transformed into electricity later. This means, UHS is like a big battery in 1000-meter depth! Also, it is very safe because the storage formations are so deep and oxygen-free, there is no risk for humans or nature.
Our energy demand is pretty steady with some annually variations. Renewable energy like electricity from wind, water or solar is, however, a very variable resource. What can we do when we need energy but there is no wind? Going for 100% renewable energy will not work without energy storage where surplus electricity is used to produce hydrogen by electrolysis. Hydrogen can then be pumped and stored and when the energy production is low, hydrogen can be used to again produce electricity. This will give us a steady energy production throughout the year.
Although there a handful UHS sites in the world already, there are still open questions we have to resolve first before we can start employing UHS in Norway. These research question span from basic knowledge on physical properties to site-specific questions on hydrogen movement and -loss.
Hydrogen underground storage (Illustration).
Here are some examples we are working on:
Because hydrogen has unique properties and behavior in geological formations, experiments must be performed at high pressures, temperatures or salinities. This can be quite difficult but in NORCE we have all needed interdisciplinary competence and year-long experience in subsurface processes to be able to do this. Our goal is to promote and help UHS to become a secure and reliable technology for Norway and the world, so we can take the next step in the transition into a carbon-emission-free world!
Contact us, if you want to collaborate with us on this fascinating topic!