Case Study · Tervakorpi, Finland
30 MW in Northern Finland — the reference no competitor can replicate.
Tervakorpi is WLF's flagship deployment: a 30 MW battery energy storage system in Northern Finland, independently reviewed and project-financed. It is the European reference for BESS performance data at this scale.
- 30 MW
- Phase 1 capacity
- +95 MW
- Expansion (contingent on Phase 1 results)
- ~30%
- IRR at full deployment
- €10–41M
- Capex deployment, 2026
Why Tervakorpi matters
Project-finance lenders do not fund unproven hardware. That is the barrier every battery storage developer runs into — and it is the barrier Tervakorpi clears. The deployment has been reviewed by an Independent Technical Advisor (ITA) and is financed by ING, giving developers and IPPs a bankable reference built on independently verified data rather than vendor claims.
The deployment
Phase 1 delivers 30 MW, with a planned +95 MW expansion contingent on Phase 1 results. Capex deployment for 2026 sits in the €10–41M range, targeting an IRR of approximately 30% at full deployment. The system runs WLF's full stack — location-adaptive chemistry, BMS, the proprietary EMS trading layer, and long-term O&M.
What it proves
- Bankability: ITA-reviewed and ING-financed — the documentation project-finance lenders require.
- Performance at scale: independently reviewed data at 30 MW, in a demanding Northern grid environment.
- The full stack, working together: chemistry, BMS, EMS and grid trading operating as one integrated system.
Want the Tervakorpi data for your finance team?
Book a call and we'll walk your team through the ITA-reviewed performance data and the grid-services revenue stack.