A hybrid energy storage system combining lithium-ion batteries with mechanical energy storage in the form of flywheels has gone into operation in the Netherlands, from technology providers Leclanché and S4 Energy.
Switzerland-headquartered battery and storage system provider Leclanché emailed Energy-Storage.news this week to announce that what began as a small-scale pilot of the twinned technologies has now gone to grid-scale and into commercial operation.
The hybrid system combines 8.8MW / 7.12MWh of lithium-ion batteries with six flywheels adding up to 3MW of power. It will provide 9MW of frequency stabilising primary control power to the transmission grid operated by TenneT and is located in Almelo, a city in the Overijssel province in the east Netherlands.
The system’s provision of services into the market will be managed by S4 Ancillary Services, a joint venture (JV) part-owned by flywheel manufacturer and supplier S4 Energy. S4’s partner in the JV is a local government-owned entity, Energiefonds Overijssel, which aims to accelerate the transition to clean energy in the province. Overijssel is targeting 20% renewables by 2023 and the storage system helps the local grid to manage increased shares of variable renewable generation.
“We believe that the combination of these two technologies provides a clear advantage for enhanced ancillary services and the further integration of renewables into the grid,” Leclanché VP for system engineering Daniel Fohr said.
Hybrid combination plays to complementary strengths of each technology
S4 Energy launched into the frequency containment reserve market using a combination of its KINEXT flywheels and batteries in 2017. According to the company’s project director Dominique Becker Hoff, the flywheel supplies instantaneous power for very short periods of time without losing capacity. The 5,000kg KINEXT flywheel operates at 92% efficiency, storing energy as rotational mass.