Sesterce wants a closed Finnish paper mill's power and water for a 600MW AI campus

An infrastructure lead with a shortlist of European GPU suppliers sees a French operator promising more than a gigawatt in Finland ^[1][5], and has to decide whether Jämsä goes on the list. On the two reports, it belongs on the list of projects to track.

Here is what Sesterce is pitching: more than 1GW of AI capacity on existing Finnish industrial sites, built in line with demand, The Next Web reported ^[5]. Here is what has been scheduled. Phase one, at 200MW, is at most a fifth of that goal ^[21]. Phase two would triple it ^[20]. The anchor customer in Sesterce's statement ^[22] means any second buyer starts the first phase with someone ahead of them in the queue.

Sesterce's argument for the mill is its hookups. "Our goal is to preserve the area's industrial identity while making use of existing infrastructure, including the power grid, water systems, buildings and logistics connections," chief executive Youssef El Manssouri said ^[6]. UPM shut the mill in early 2021 ^[3]. Jämsä's mayor, Jori Reijula, called the project "an interesting opportunity to strengthen the vitality of the region, provided it progresses from plans to implementation and meets the applicable requirements" ^[8].

Reused connections should make a build faster than clearing new land, and Finland has a current example of what new land runs into. Google, which said in September it would spend €13bn on Finnish AI infrastructure in 2027 and 2028, was ordered by a Finnish regulator this week to stop clearing forest at two planned sites ^[18][19]. I'd expect a built-up mill site to avoid that dispute. Neither report gives an energisation date for the first 200MW, so the speed advantage has no number on it yet.

The renewable pledge comes in two versions. In DatacenterDynamics' account, Sesterce commits to "enabling" a megawatt of new renewables for each megawatt consumed, within 10 years of the campus becoming operational ^[9]. The Next Web gives the window as the next ten years ^[10]. The gap between those two clocks is the construction period. The reports also split on currency: €10bn against $10bn for the campus, and €10 million against $10 million for the community fund ^{[1][2][11][12]}.

Cooling is a closed-loop liquid system topped up with harvested rainwater and recycled water ^[16]. El Manssouri also said the campuses will "feature controllable and flexible power consumption" ^[17]. A tenant running long training jobs will want the contract to say who decides when that consumption is cut.

The sovereign case rests on ownership. Sesterce is French ^[1]. Its other gigawatt project, a campus in Bosquel in northern France, is a June agreement with SoftBank Group ^[13], and it announced a $471m AI data centre in Valence last year ^[14]. A buyer who only needs an EU-headquartered operator has that answer now. A buyer whose rules extend to co-investors and anchor tenants has more questions to put to Sesterce.

The test I'd apply to Jämsä, and to the next conversion of an old industrial site, is a 2x2. One axis is whether the site has changed hands and cleared permits. The other is whether capacity has a delivery date for a customer other than the anchor. A project with both can be priced against greenfield builds. Land settled with no date means a quarterly check-in. A date with no permits is a risk to price into the contract. Neither puts the project on a watch list. On the published record, Jämsä is in that last box: the sale is still being negotiated, permits are pending, and the one customer commitment belongs to the anchor ^[15][7][22].