BESS battery storage system

Summary

The tender concerns the design, supply, installation and commissioning of an outdoor Battery Energy Storage System (BESS) for the Törnäväntie campus of Seinäjoki Joint Municipal Authority for Education. The system will be integrated into the property’s electrical system and must support reserve and electricity market use. The contractor is responsible for the complete delivery, including design, permit-related plans, equipment and component supply, installation and electrical works, commissioning, testing, regulatory approvals, handover documentation, user training, and operation, maintenance and servicing. Two lots are available: Lot 1 requires at least 250 kVA charging and discharging power and 500 kWh capacity; Lot 2 is an alternative with at least 90 kVA and 200 kWh, but requires five years of service and warranty instead of three. Tenders must be submitted by 11 September 2026 at 10:00 UTC.