Finnish TSO demands engine capacity to balance surging data centre demand
Finland's grid operator is pushing for dispatchable engine power to stabilise a system where data centres will triple electricity demand by 2030.
Finland's transmission system operator has called for new engine-based power capacity to balance the grid as data centre demand heads toward 1.2 GW by 2030, a more than threefold rise from current levels. The Finnish Data Center Association said operational data centre capacity stood at around 368 MW, accounting for roughly 2% of national consumption, with growth expected to accelerate as new projects advance.2
The TSO's request shifts the debate in a country that has leaned heavily on wind to meet its power needs. Installed wind capacity reached 9.4 GW in 2025, covering around 28% of total electricity consumption, according to Renewables Finland. But wind output is intermittent, and data centres need constant supply, which means the system requires something that can ramp quickly when the wind drops.1
That something, in the TSO's view, is engine power. The call signals a recognition that renewable buildout alone will not keep the lights on for hyperscale computing facilities that run around the clock. Industry participants told Montel that rising power demand from data centres and electric boilers would likely support a new wave of Finnish onshore wind investment, with one saying further investments in wind power seem inevitable.1
The tension is not unique to Finland. ENTSO-E has warned that Europe's transmission system operators may be forced to reduce renewable energy penetration if growing data centre demand is not properly managed. That warning, issued in May, frames the Finnish TSO's request as part of a broader continental problem rather than a local quirk.5
Fortum CEO Markus Rauramo has taken a more optimistic view, telling Montel in late April that renewable energy can in many cases meet growing data centre power demand across the Nordics without new nuclear capacity in the short term. He repeated that message in June, saying Finland can handle massive power demand growth given land availability and grid access.4,6
The divergence between the TSO's engine-power push and Fortum's renewables-first stance is worth watching. One is responsible for grid stability; the other for commercial generation. Their different mandates naturally produce different answers to the same question of how to power the AI buildout.4
Finland's day-ahead power price stood at €51.25/MWh on Tuesday (2026-08-18) morning, well below the German benchmark of €131.79/MWh. That price gap already attracts energy-intensive industry, and data centre developers are no exception. Cheap Nordic power plus land plus grid access makes Finland an obvious location for compute expansion. [LIVE_PRICES]
But cheap power depends on system balance. If the grid operator must procure engine capacity to back up wind, those costs flow into the system, potentially narrowing Finland's price advantage. Engine power typically means gas or diesel reciprocating engines, which carry fuel costs and emissions that wind does not.1
The data centre lobby sees the demand growth as inevitable. FDCA director Antti Poikola told a conference in Helsinki that further demand growth is expected as new projects advance, though he gave no specific timeline beyond the 2030 tripling forecast. The association's numbers suggest data centres could eventually consume a much larger share of Finnish power than the current 2%.2
Goldman Sachs estimates that up to a third of incremental data centre capacity, or 25 GW, will be built off-grid in the US over the next five years, an indication that grid connection limits are biting elsewhere too. If the US is pushing data centres off-grid, Finland's approach of keeping them on-grid but adding dispatchable backup is a different bet on how the AI power problem gets solved.3
The open risk is cost. Engine capacity that runs rarely but must be available is a capacity payment problem, and Finnish consumers and industrial users will ultimately carry that bill. Whether the TSO's engine call translates into new investment depends on how the market design rewards availability, a question Finnish regulators have yet to answer publicly.1
What to watch next: whether the TSO formalises its engine-power request into a capacity mechanism, and whether Fortum's renewables-first path can actually deliver the balance the grid operator says it needs. The gap between those two positions will define Finland's power market through the data centre buildout.4,1