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Project Description

The vision of this project is to develop and demonstrate a viable energy storage method for offshore purposes by means of the flywheel technology. It will lower the energy consumption of the drilling vessels by 20% at a substantially lower price compared to other energy storage solutions, thus developing a new Danish industry in energy storage.

A flywheel is an energy storage system where a specific mass (the flywheel) is rotated in a vacuum, which allows energy to be stored by acceleration and discharged by deceleration. Most significant advantage of Flywheel Energy Storage System (FESS) compared to other energy storage devices is the ability of fast power charge and discharge that makes this technology superior and the most suitable for offshore applications aboard a drilling vessel. Currently batteries have been deployed in a few maritime settings, but batteries are not the right solution for demanding maritime use for energy storage due to low lifetime with a discharging capacity of 2,000 times compared to FESS that can be charged 25K- 50K times.

For this project, the FESS will be developed and demonstrated to meet the specific requirements for drilling vessels and vessels. The project will integrate FESS technology into the power distribution systems of drilling vessels and vessels to increase their efficiency. By using FESS the vessels can use smaller engines and increasing operational load point leading them to operate with improved fuel efficiency, where the FESS will kick in when additional power is needed. Vessels are having fluctuating power demand during their operations meaning that their engines are chosen according to the maximum load needed.



The objective of the project is to develop a flywheel unit specialized for the needs of maritime application with following specific requirements:

  • To construct the FESS which complies with all relevant class regulations, ISO and IEC standards and which should operate for a period of minimum twenty (20) years regardless of the number of discharging and charging cycles.
  • To build a detailed real-time simulation model of the drilling vessel and use it to define the specifications that new flywheel needs to fulfil in order to comply with a number of typical scenarios defined by Maersk Drilling.
  • To test the physical flywheel via power hardware in the loop emulation.
  • To test flywheel on a real drilling vessel.
  • To develop and test control system functionalities for the power distribution system including FESS.




Project Manager

Professor Josep M. Guerrero
Direct phone: +45 9240 9726
E-mail: joz@et.aau.dk


Professor Juan C. Vasquez
Amjad Anvari-moghaddam
Tomislav Dragicevic
Lexuan Meng


Budget: DKK 16 million

Innovation Fund Denmark investment: DKK 8.5 million

Duration: 2014 - 2018

Danish Maritime Fund investment: DKK 1.9 million