Energy storage is the process of storing energy for later use, as efficiently as possible. There are many different technologies and processes for producing energy and storing it in various forms so that it can be recycled. Batteries are a good example of an energy storage technology, but the question is whether it is the best solution in the future.

The idea of ​​saving energy for later use is very relevant in the context of stabilizing our future energy system. It is expected that there will be fluctuating production and consumption of energy, as our energy sources are more based on wind and solar.

Today, it is a challenge to store energy on a large scale without significant losses. Much work and research are done in chemical and thermal energy storage, as well as the further development of batteries, both in Denmark and abroad.

Hydrogen can be used for energy storage, as both wind and solar energy can be used to produce hydrogen through electrolysis of water. In modern electrolysis plants, up to 80% of the electrical energy can be converted into chemical energy in the hydrogen molecules. In connection with large-scale hydrogen production, there are studies that indicate that hydrogen can be stored for later use in large salt caverns. When you want to use the stored energy again, the hydrogen can be passed through a fuel cell to generate electrical energy and heat. However, energy storage methods like this are not realistic today and require more research, infrastructure and upscaling.