Nala Starts Building 250 MWh Finnish Battery as Reserve Prices Fall

Nala Renewables has issued notice to proceed on the 125 MW / 250 MWh Vuolijoki battery in central Finland, moving one of the country’s largest battery energy storage system (BESS) projects into construction. The announcement, made on 7-8 October 2026, is the latest sign of how much capital is still entering the Finland BESS market.

The timing is awkward. Fingrid, Finland’s grid operator, cleared its 2026 annual reserve auctions at lower prices, and more of its purchasing has moved into hourly markets.

That raises an obvious question for a project of this size: where do the returns come from once the easy reserve income thins out?

This piece covers who is building and funding Vuolijoki, why reserve prices are under pressure, and what both trends mean if you are watching Finnish storage as an investor.

Who is building Vuolijoki, and where does it sit in Nala’s Finnish pipeline?

The deal chain is short. Swiss developer Fu-Gen sold the ready-to-build Vuolijoki project to Nala in February 2026. Eight months later, Nala issued its notice to proceed, the formal instruction that lets contractors start building.

Nala describes Vuolijoki as among the largest BESS projects in Finland to enter construction. The delivery team is:

• Despro, a Finnish engineering firm, as EPCM contractor (engineering, procurement and construction management, meaning it designs and coordinates the build)
• Destia Oy on balance of plant, the supporting electrical and civil works around the batteries
• Sungrow as battery supplier
• Rabobank as long-term lender

Remy Verot, Nala’s interim chief executive, credited the company’s in-house skills across development, financing, construction and operations, together with its partners, for positioning it to deliver projects in Finland and its other markets.

Vuolijoki is not a one-off bet. It sits beside two other Finnish projects.

Kärppiö’s size is reported inconsistently. One Nala source describes a 50 MW project, but the most recent reporting gives 100 MW / 200 MWh, which matches the portfolio total. Commissioning dates for Vuolijoki and Kärppiö have not been published.

A major bank lending long-term, alongside an infrastructure owner such as IFM Investors, tells you Finnish storage is now being financed like infrastructure rather than treated as an experiment.

Finland’s pipeline is one regional expression of a wider build-out of grid-scale energy storage, where falling system costs and rising renewable penetration are drawing infrastructure capital into projects once seen as experimental.

Why are Fingrid reserve prices falling, and what does it mean for battery revenues?

Fingrid buys frequency reserves, capacity that responds within seconds to keep the grid stable. FCR-N handles normal frequency swings; FCR-D up and down respond to disturbances. For 2026, the obligations are 126 MW of FCR-N, at most 305 MW of FCR-D up and at most 293 MW of FCR-D down.

Here is how the annual auctions cleared.

The hourly figures are derived by subtracting annual volume from the obligation. They are estimates, not Fingrid disclosures.

Annual FCR-N procurement was zero. Every megawatt of that product now gets bought hour by hour.

Fingrid’s 2025 annual clearing prices were not available, so the size of the year-on-year fall cannot be measured here. The direction is clear, though, and three forces drive it:

1. New battery supply. Projects such as Vuolijoki, Kauhava and Pedersöre chase obligations that barely move, so more bidders compete for the same megawatts.
2. Annual to hourly procurement. Frequent, short-term auctions tend to pull average prices below long-term contracts.
3. Wider participation. Nordic reserve markets now admit cross-border resources, demand response and hydro flexibility alongside batteries.

Fingrid frames lower prices as evidence that flexibility is being integrated successfully, not that the grid needs fewer reserves.

For anyone assessing a Finnish battery, the zero annual FCR-N result means fixed-price reserve income can no longer be assumed. Returns now depend on how well an operator trades hourly and across markets.

The shift from fixed reserve contracts to hourly trading changes how batteries earn revenue, with arbitrage, balancing products and capacity payments each carrying different risk and return profiles for owners.

Can the Finland BESS market still deliver infrastructure-grade returns?

Sponsors remain confident. Nala, Swedish developer Ingrid Capacity and French investor Mirova argue that renewables growth, electrification and interconnection will keep prices volatile and grid services in demand.

Sponsors point to the broader European battery market outlook, in which renewables growth and interconnection are expected to keep price volatility high and sustain demand for flexible grid services across the continent.

Mirova backed that view in late September with €65 million of equity into 145 MW / 290 MWh across two projects: Vaggeryd in Sweden (100 MW / 200 MWh) and Pedersöre in Finland (45 MW / 90 MWh, ready to build). They are the first investments of its Nordic Storage Platform, with Ingrid Capacity running and optimising both assets.

Lender confidence Gijs Hofman, executive director at Rabobank, said the Vuolijoki financing builds on the bank’s relationship with Nala and its owner IFM Investors, a key institutional client.

The revenue plan goes beyond reserves: day-ahead and intraday arbitrage (buying power cheaply and selling it later), aFRR and mFRR (slower balancing reserves, considered less crowded than FCR), and congestion management on strained parts of the grid.

Precedents from Sweden, Germany and the Baltics

Some lenders and analysts are warier, and the neighbours give them material. In Sweden, Germany and the Baltics, early batteries leaned on FCR, prices compressed as capacity arrived, and earnings shifted toward arbitrage and broader balancing.

If you are weighing exposure, those precedents suggest returns will favour sophisticated multi-market operators over projects built around one reserve product.

Risks that could change the picture

• Cannibalisation: more batteries chasing fixed volumes compresses prices
• Merchant exposure: few long-term fixed contracts, so lenders size debt conservatively
• Grid connection constraints: queues and reinforcement costs where projects cluster
• Market-design changes: new bidding rules or a different annual/hourly balance

National installed and pipeline totals are not publicly aggregated, so market-wide saturation cannot be measured precisely.

What Vuolijoki signals, and what to watch as Finnish storage scales

Vuolijoki shows capital is still flowing into Finnish batteries despite softer reserve prices. What has changed is the basis of the bet: returns now rest on operators trading well across several markets.

Three things deserve your attention next:

• Commissioning dates for Vuolijoki and Kärppiö, which remain unpublished
• Fingrid’s next auction results and the split between annual and hourly buying
• Further platform deals similar to Mirova and Ingrid Capacity’s

Watch who wins the operator role, not just who funds the build.

Readers interested in hedging merchant price exposure can use our deep-dive into electricity futures markets, which explains how derivatives manage power price risk.

This article is for informational purposes only and should not be considered financial advice. Investors should conduct their own research and consult with financial professionals before making investment decisions. Forward-looking statements are speculative and subject to change based on market developments and company performance.