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Innovative Collaboration with Eniig and Aarhus University

22 August 2017

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Aarhus Universitet logo

VisBlue has entered an exciting new project called Grid Connected Flow Batteries (GCFB) along with Eniig (formerly known as EnergiMidt and HEF) and Aarhus University (AU). The project, that is funded by EUDP, will be field-testing vanadium redox flow batteries (VRFB) in order to figure out how these batteries can add flexibility to the low voltage grid.



In the future, it is expected that more PV installations will be found at companies and private households. Extra PV installations may cause temporary local imbalances in the respective feeder lines. VRFBs are seen as the cheapest local stationary electricity storage technology that fits the needs of supplementary services in the low voltage grid. At the same time VRFBs are both robust, flexible and environmentally safe. Redox flow batteries (RFB) provide scalability between storage facility and battery power. In other words, this means that VisBlue is able to customise batteries according to the needs of the user.

Furthermore, the technology creates the opportunity for the grid owner to dimension the technology in steps as a flexible process as the demands from the specific feeder lines become clearer.



“Vanadium redox flow batteries are the sustainable and low-cost power solution of the future”

Søren Bødker, CEO of VisBlue



As a grid operating company, the role of Eniig, in the project, is to contribute to a continued stable grid, as well as managing the balancing power. Eniig will also look into new business areas, deregulated as well as regulated. Eniig’s motivation for joining this project is to increase the knowledge of how to resolve the challenges that exist within the low voltage grid. Specifically, Eniig will look at the challenges regarding under and overvoltage in the customer’s connection point, which can be caused by large utility items, converging consumption and production from sustained energy plants. Eniig will look to reduce fast voltage changes, which makes light flicker for one thing. A crash in Eniig’s battery unit would be catastrophic for all of their customers, thus it is important that the security of the battery is higher than that of a Li-ion battery. In the end, all of this should lead to fewer challenges which will result in cheaper solutions for the customers of Eniig.


Aarhus University, led by Anders Bentien, will first and foremost assist VisBlue in the configuration and development of the VRFB as well as grid-analyses.

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VisBlue strives to keep a good dialogue with the press and appreciates quick responses to enquiries. Enquiries from the press should be addressed to CEO Søren Bødker.



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