For some time now, S4 Energy has been providing services to grid operator TenneT for maintaining the balance of the grid. The installation in Almelo, consisting of Kinext flywheels and batteries from 2017, has been expanded by S4 Energy to a capacity of 9MW. To support the flywheels and the battery, Batenburg Energietechniek, Batenburg Installatietechniek and Beenen jointly supplied, installed and connected eight different stations.
Expansion of hybrid electricity storage
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Accessible transformer substations
The eight substations consist of an accessible transformer substation, a medium-voltage substation containing a Siemens medium-voltage installation, two accessible FDU stations for controlling the flywheels, three compact substations with transformers and a compact substation with transformer and low-voltage distributor. Batenburg Installatietechniek and Beenen provided the medium and low-voltage cabling between the substations.
A sophisticated, complex and technical project
The method S4 Energy uses to supply energy back to TenneT is unique. ‘Our flywheel technology delivers high powers instantly, without any loss of capacity,’ says Dominique Becker Hoff, Project Director at S4 Energy. Although the Kinext flywheel delivers high power, its energy capacity is low. To compensate for this, S4 Energy developed a hybrid system for TenneT that combines the best of ‘spinning masses’ and the latest battery technology. Becker Hoff: ‘The Kinext flywheels handle the short power peaks, and during long-term variations, we switch on the batteries. Together, they complement each other perfectly.’