Groundbreaking batteries from Delft and Stadskanaal

A huge breakthrough

It is a well-known fact that the growing numbers of wind turbines and solar panels are generating more and more electricity. So much electricity, in fact, that the grid is struggling to cope with the growing supply. One solution for this is to create more storage and use more methods of storage to better align the production of and the demand for electricity, preferably by means of a circular process. Efforts are being made in this area in Delft and Stadskanaal. The BlueBattery and the BioBased Battery are just two examples of promising developments.

BioBased Battery: sand, salt, leaves, and ceramic electrodes

SuWoTec, based in Stadskanaal, is working hard on the development of the BioBased Battery. This is a battery concept that could be groundbreaking in terms of price and capacity, as well as sustainability. This is because the components used in this battery are sand, salt, leaves, and ceramic electrodes.

Fully circular battery

SuWoTec, an abbreviation of ‘sustainable world technology’, already has a functioning prototype of this fully circular battery. The principle of this battery is highly suitable for storing energy that has been generated ‘at home’ close by. The company thinks it will be able to produce a 27-kWh battery at a price of 2,700 euros. This price is far more competitive than the price for Tesla and LG products.

Scalable up to one megawatt

The BioBased Battery has quite a considerable size. A 27-kWh battery would be a cubic metre in size. However, it is suitable for burying in the ground or placing in a container. The concept of the BioBased Battery is also suitable for larger systems, for example up to one megawatt. More information can be found at

BlueBattery: water and table salt

AquaBattery in Delft claims that the BlueBattery that it has developed is the world’s only 100% sustainable storage system. In order to store electricity, this concept only requires water and table salt. It stores energy in the concentration difference between fresh water and salt water. It does not make use of harmful chemical substances and is therefore safe. In addition, this battery is affordable and scalable.

Autonomous within a microgrid

AquaBattery is currently running a demonstration project in The Green Village in Delft, an initiative by Delft University of Technology and the Green Village foundation. Here, a BlueBattery has been functioning completely autonomously within a microgrid since 2017. It is not connected to a macrogrid. Up to 10 kWh of electricity from solar panels can be stored in this battery.

Energy Island in the Westerschelde

At the end of 2019, AquaBattery wants to bring out a special version of the battery that is suitable for households. However, the principle of the battery can also be scaled up, as demonstrated in the following animation from AquaBattery for the competition for the Energy Island in the Westerschelde.