November 12, 2019 – The Norwegian fish farming company Kvarøy has begun using a large-scale storage system manufactured by Tesvolt at its salmon farm off the coast of the island of Selsøyvær in the Norwegian Sea. On board the floating control platform, lithium batteries with a total storage capacity of 158 kilowatt hours (kWh) reduce the company’s diesel generators’ operating time from 24 hours a day to just three.
In the 18 months it takes to breed a generation of salmon, the company manages to save between 150,000 and 200,000 euros in operating costs while reducing its carbon footprint at the same time. The battery system was developed by German commercial storage system manufacturer Tesvolt as part of a cooperative effort with its Norwegian partner company Kverneland Energi.
Kvarøy attaches great importance to sustainable fish farming. Therefore, reducing high diesel consumption associated with operating the fish farm and the feeding systems was one of its key objectives. Two large diesel generators and one small one were in use on the anchored concrete platform. At least one of the two generators needed to be in permanent operation since there was no power supply unit on board. At the same time, the electricity demand fluctuates drastically throughout the day — lots of energy is needed at feeding times, while at other times, the only thing in need of power is the light that shines on the approximately 20 by 20 meter engineless ship. Due to long runtimes and the generators’ poor combustion of diesel, every kilowatt hour of power meant substantial costs.
But Tesvolt and Kverneland Energi were able to come up with a special solution for the unusual site of operation. With its 120 kW peak power capacity, the battery system can be monitored and controlled online from the mainland. The power electronics provided by Siemens ensure fully automated control of all energy flows on board the platform to feed power to all the consumers. A diesel generator still generates power for the rechargeable batteries when the system is at full capacity operation. In turn, this battery power is fed to all the sources of electricity consumption. The generator is not activated until the state of charge is so low that the batteries need it to be charged up again. The battery system enables a reduction in the fish farm’s total diesel consumption of up to 60 percent. Another positive secondary effect is the fact that Kvarøy’s team no longer has to change the diesel generators’ oil every month, but rather only twice a year. This not only cuts costs, it also reduces carbon emissions into the environment.