What Google’s Finnish Nuclear Power Deal Really Buys

An AI chatbot reply feels weightless. You type a prompt, a cursor blinks, and an answer appears. Behind that moment sits a data center: an industrial building packed with servers, networking equipment, cooling systems, and backup power.

On September 9, 2026, Google announced a €13 billion expansion in Finland that will add data-center capacity in Kajaani, Muhos, and Vaala while enlarging its existing site in Hamina. The plan also includes a 22-year agreement with Fortum for up to half of the capacity of the Loviisa nuclear power plant. What does it mean for Google to buy half of a nuclear power plant? The answer is less dramatic than a private reactor and more revealing about the physical demands of artificial intelligence. (blog.google)

The headline needs a translation

A power purchase agreement, usually shortened to PPA, is a long-term contract in which an electricity producer agrees to sell power to a buyer under specified commercial terms. The buyer gets a predictable source of electricity or energy-market exposure, while the producer gets a customer whose commitment can help support major investments.

Google is not purchasing half of Fortum’s facility, hiring the reactor operators, or building a private cable from Loviisa to every server rack. Electricity flows through a shared grid, where power from nuclear plants, wind farms, hydroelectric stations, and other generators is mixed together. A useful analogy is a river: once water enters the river, it cannot be tagged for one particular household, even though contracts can still determine who paid for a certain volume. Google has described the same physical reality in its explanation of power purchase agreements. (sustainability.google)

So “half the electricity” is shorthand for a contractual commitment to up to half of Loviisa’s generating capacity. That distinction matters, especially when a headline makes the arrangement sound like Google has claimed a dedicated portion of the plant’s physical electrons.

Half of what number?

To understand the scale, separate power from energy. Power is the rate at which electricity can be produced, measured in megawatts. Energy is the amount produced over time, measured in units such as megawatt-hours or terawatt-hours.

Loviisa has two pressurized-water reactors. In this reactor design, water carries heat from the nuclear core to equipment that produces steam for a turbine. Each unit has a net electrical output of about 507 megawatts, giving the plant a combined rated capacity of roughly 1,014 megawatts. Fortum reports that Loviisa produced 7.9 terawatt-hours in 2025 and supplies about 10% of Finland’s electricity. (fortum.com)

A rough way to picture the contract is:

2 reactor units × 507 MW ≈ 1,014 MW total capacity
50% of that capacity ≈ 507 MW
Half of 7.9 TWh of annual output ≈ 3.95 TWh

The last line is an illustration, not a guaranteed delivery figure. The agreement begins with a smaller contracted amount in 2028 and reaches up to 50% of the plant’s capacity during 2030–2049. Planned maintenance, unexpected outages, electricity demand, and the plant’s actual operating level all affect how much energy is generated in a particular year. Loviisa’s operating licence runs through the end of 2050. (fortum.com)

Why AI turns electricity into infrastructure

Artificial intelligence, or AI, is software designed to perform tasks such as recognizing patterns, generating text, or interpreting images. The systems behind those services run on specialized chips inside data centers. Training means building a model’s internal parameters from large datasets; inference means using the trained model to produce an answer, prediction, or image.

Both activities consume electricity, but the broader service must also keep storage, networking, cooling, lighting, power conversion, and monitoring systems running. That makes an AI data center a large industrial electricity customer rather than a normal office with more computers. The International Energy Agency reported that electricity use by data centers rose 17% in 2025, while AI-focused data centers grew faster than overall electricity demand. (iea.org)

This is where nuclear power becomes attractive. A nuclear plant can provide steady, low-carbon generation through the night and during calm weather. Energy planners often call this kind of supply firm power: electricity expected to be available when needed, within the limits of maintenance schedules, grid conditions, and unexpected equipment problems. It is not infallible, but it is less dependent on sunlight or wind at the moment a server cluster needs power.

A long contract can help both sides plan. Google gets a clearer view of its future electricity arrangements, while Fortum gains revenue certainty for keeping an ageing but valuable plant operating. The contract does not eliminate technical or regulatory risk, but it can make a large modernization program easier to finance.

Why Finland fits the plan

Finland offers more than a cold climate. Cooler outdoor temperatures can reduce the work required to remove heat from servers, and Google’s Hamina facility has used seawater-based cooling. Google has also described heat-recovery projects that distribute recovered warmth to nearby homes and businesses.

The existing Hamina data center began in a converted paper mill in 2009. The new investment will extend that Finnish footprint while adding sites farther north and east. Google says the energy package also includes new onshore wind capacity and a 94-megawatt battery system designed to help during cold, windless periods. A battery does not create electricity; it shifts some electricity through time, charging when supply is plentiful and discharging when the grid needs support. (blog.google)

That combination is important. Nuclear power supplies a steady foundation, wind can add large amounts of low-carbon energy when conditions are favorable, and batteries can smooth shorter periods of imbalance. No single technology has to carry the entire system.

The contract also keeps an old plant relevant

The Loviisa agreement is not only about powering new servers. Fortum is pursuing an investment program of roughly €1 billion to extend the plant’s life through 2050. The program includes hundreds of projects, a planned 38-megawatt capacity increase expected by 2028, and a further potential 10-megawatt increase linked to the Google partnership.

That makes the PPA a bridge between two infrastructure timelines. Google is building facilities for the next wave of AI services, while Fortum is modernizing equipment that began producing electricity in the 1970s and 1980s. The digital expansion creates a long-term customer for the energy expansion, and the energy expansion gives the data centers a stronger low-carbon supply base.

What the headline leaves out

A nuclear PPA does not make a Google data center carbon-free every hour. The facility still draws electricity from the regional grid, and the plant’s output is mixed with power from other generators. If Loviisa is offline for maintenance, or if Google’s demand rises beyond the contracted amount, the grid supplies the difference.

This is the difference between annual matching and hourly matching. A company may contract enough low-carbon electricity over a year to equal its consumption, yet still use higher-carbon grid power during particular hours. Google has described its longer-term goal as matching data-center demand with carbon-free energy around the clock, not only balancing the yearly total. The Loviisa deal moves that effort toward a steadier source, but it does not finish the job. (sustainability.google)

The larger story is that AI infrastructure now includes power contracts, transmission capacity, cooling design, batteries, and generation projects. Google is not buying half a reactor in the literal sense. It is buying long-term access to a large block of dependable low-carbon electricity while helping Fortum justify the investment needed to keep that block on Finland’s grid. That is why a data-center announcement has become an energy story too.