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Construction is not confirmed as started. Fu-Gen’s 16 February 2026 announcement said it had closed the sale of a ready-to-build, 125-MW standalone battery energy storage system (BESS) in Vuolijoki, central Finland, to Nala Renewables, with construction expected to start later in 2026. The announcement did not state the project’s energy capacity in megawatt-hours (MWh), so the 250-MWh figure in the original headline is unverified.
Has construction started on the Vuolijoki battery project?
Not according to the available project-specific announcement. Fu-Gen reported on 16 February 2026 that it had closed the transaction with Nala Renewables and described the project as ready to build. It said construction was expected to start later in 2026, but gave no specific start date and did not report a groundbreaking or confirm that work had begun. Fu-Gen’s announcement also does not provide a commercial operation date.
What is confirmed about the project?
- Location: Vuolijoki, central Finland.
- Type: A standalone battery energy storage system.
- Power rating: 125 MW, according to Fu-Gen.
- Transaction: Fu-Gen said it closed the sale to Nala Renewables. The deal was the first transaction under the companies’ Finnish BESS framework agreement.
The announcement does not identify the battery supplier, chemistry, engineering and construction contractor, financing provider, power-trading or optimisation arrangement, or an offtake contract. Those details should not be inferred from other Finnish projects.
Is the project really 250 MWh, or a two-hour battery?
Neither figure is confirmed in Fu-Gen’s Vuolijoki announcement: it gives a 125-MW power rating but no MWh capacity. A 250-MWh system would imply two hours of storage at full rated power (250 MWh ÷ 125 MW), but that is a conditional calculation, not a disclosed specification for Vuolijoki. Without a project-specific capacity figure, the battery’s duration cannot be established.
How does Vuolijoki differ from Nala’s other Finnish BESS projects?
Several Finnish developments appear in Nala and Fu-Gen’s announcements, but their specifications and construction updates apply to different sites.
| Project or portfolio announcement | What the source states | What it means for Vuolijoki |
|---|---|---|
| Vuolijoki, February 2026 | Fu-Gen reported a closed transaction for a 125-MW ready-to-build standalone BESS. Construction was expected to start later in 2026; no MWh capacity was given. Source | These are the confirmed project-specific details. |
| Four-site Finnish framework portfolio, October 2025 | Nala described over 250 MW expected across four ready-to-build sites, each then expected to commence construction in 2026. Source | Portfolio expectations do not show that Vuolijoki, or every site, has started construction. |
| Kauhava, November 2025 and August 2026 | Nala described a separate 50-MW/100-MWh project, with financing from Société Générale and delivery by Sungrow and KSBR. Nala later said Kauhava was energised on 28 August 2026 and had entered commissioning and testing. November 2025 announcement; August 2026 update | Kauhava’s capacity, suppliers, financing and status are not Vuolijoki’s specifications or status. |
| Teuva, October 2026 | Fu-Gen reported a separate 100-MW ready-to-build BESS sold to Nala and said Nala’s Finnish pipeline reached 275 MW / 550 MWh. Source | The pipeline total adds portfolio context but does not confirm Vuolijoki’s construction progress or capacity. |
What does “ready-to-build” establish?
In Fu-Gen’s announcement, “ready-to-build” describes the project’s development stage at the time of the transaction. It is not confirmation that construction had started. The same distinction matters for the October 2025 framework portfolio: Nala said construction at the four sites was expected in 2026, which is a forecast rather than a site-by-site completion update.
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