A 68-tonne articulated truck rolling through a Finnish winter is a demanding place to test any new powertrain. Sisu Auto and VTT Technical Research Centre of Finland are about to make that setting their laboratory with the SISU Escalate, a battery-electric heavy truck supported by a hydrogen fuel cell. Beginning normal transport work in late 2026, the vehicle is scheduled to cover about 540 kilometres a day while researchers track energy use, reliability and weather-related changes over six months.
The machine pairs a 650-kWh battery with a 120-kW fuel cell, but the point is not simply to prove that it can move. The trial is designed to find out whether a battery-first, hydrogen-supported truck can make sense in real freight work where payload, charging time, winter weather and energy cost all matter at once.
The 68-tonne Figure Covers the Whole Combination
The headline figure needs one important clarification: 68 tonnes is the maximum gross vehicle-combination weight permitted for this pilot, not the weight of the tractor itself. That means the test concerns the truck, trailer and load operating together at a scale much closer to real Nordic freight than a lightly loaded demonstration vehicle. VTT says the configuration is intended to explore zero-emission technology in the longer, heavier combinations commonly used in Finland and Sweden.
Finland is an unusually useful proving ground for that question. Traficom says the country raised the maximum permitted vehicle-combination mass from 60 tonnes to 76 tonnes in 2013, while maximum combination length was increased to 34.5 metres in 2019. VTT contrasts those Nordic combinations with articulated trucks of roughly 40 tonnes in much of the rest of Europe. The Sisu therefore does not have the luxury of proving its technology in an easy operating envelope; it must work in a freight system built around exceptionally large combinations.
A 650-kWh Battery is Meant to Do Most of the Work
The powertrain is deliberately battery-first. VTT lists a 650-kWh battery supplied by IONCOR and a hydrogen fuel cell with a maximum output of 120 kW. The truck is expected to run mainly on electricity, with the fuel cell acting as a secondary onboard energy source for long-haul work. Packaging both systems has a physical consequence: VTT says the chassis is longer than a conventional tractor because space is needed for the battery and hydrogen tanks.
A technical summary published alongside the launch lists a target electric-only range of about 500 kilometres and about 750 kilometres with hydrogen support. Those are development targets rather than certified consumer-style range figures, but they explain the logic of the architecture. A 540-kilometre workday sits close to the edge of the stated battery-only target, so the trial can examine whether hydrogen adds useful operating flexibility without becoming the primary energy source. Sisu’s development team has also made clear that this vehicle is a test platform, not a production truck being offered for sale.
The 540-kilometre Day Turns Technology Into a Logistics Test
The daily route is what turns the project from an engineering showcase into a logistics test. Jylhä Logistics is set to operate the truck between Vuosaari harbour in southern Finland and Jyväskylä in central Finland, with a planned total of about 540 kilometres of driving per day. The vehicle will also take on regional distribution assignments in the Helsinki metropolitan area, giving researchers a mix of long-haul and shorter-duty conditions rather than one repetitive laboratory cycle.
That matters because freight vehicles live by schedules. A truck can have impressive hardware and still fail commercially if charging, refuelling or route timing repeatedly interrupts normal work. VTT says charging stations are available at both ends of the long-haul route, a megawatt-scale charging point will be built along the corridor, and hydrogen will be available in Jyväskylä. The trial therefore tests an entire operating chain: vehicle, driver, charging, hydrogen supply and timetable. The 540-kilometre target becomes a daily stress test of whether those pieces can function together.
Finnish Winter is Part of the Experiment
Winter is not an inconvenience added to this test; it is one of the variables researchers specifically want to measure. VTT plans to monitor the truck for six months and examine how weather conditions influence energy consumption, performance and operating limitations. That makes the timing significant. A powertrain that looks convincing in mild-weather demonstrations still has to prove that its energy-management strategy remains dependable when the same freight job continues through colder and harsher conditions.
The Nordic operating environment adds another layer. VTT describes the Sisu as the heaviest and longest of four trucks being piloted across Europe in this part of the ESCALATE program and calls its Finnish operating environment the most demanding of the four. Finland’s road rules help explain why: combinations can legally reach 76 tonnes when axle and configuration requirements are met. The pilot itself is capped at 68 tonnes, but it is still testing close to the heavy end of European road freight. The useful result will not be a single winter range number; it will be a record of how consumption and reliability change as conditions change.
Megawatt Charging Could Determine Whether the Schedule Works
Fast charging is a central part of the experiment because a large battery only helps if energy can be restored without destroying fleet productivity. Kempower is supplying the project’s Megawatt Charging System infrastructure, while Hevtec is responsible for the vehicle-side charging solution and integration of the electric powertrain. VTT says a megawatt-scale charging station will be installed along the long-haul route in addition to charging at both ends.
The wider Finnish charging network shows what that technology can look like in practice. Kempower says its current MCS hardware can deliver up to 1.2 MW, and a public truck-charging site near the Port of HaminaKotka opened with an MCS connection in December 2025. That does not mean the Sisu pilot will necessarily charge at 1.2 MW; VTT has only specified a megawatt-scale site for this route. It does show why the industry is pursuing MCS, however. Heavy trucks carry batteries measured in hundreds of kilowatt-hours, so reducing charging time is directly tied to keeping vehicles moving rather than parked.
Jyväskylä Gives the Hydrogen Side a Real Foothold
Hydrogen is the other half of the route strategy, and Jyväskylä gives the pilot something many experimental vehicles need: an established refuelling location. P2X Solutions says green hydrogen has been supplied to the city’s station since summer 2025, initially supporting hydrogen buses and a limited number of other vehicles. Cefmof Hydrogen operates the site, which VTT identifies as the hydrogen station the Sisu trial will use.
The infrastructure is still developing. In 2026, Cefmof began installing a containerised alkaline-water electrolyser rated at about 1 MW beside the station. The project’s stated target is roughly 400 kilograms of hydrogen production per day at full load, with regular established operation intended by the end of 2026. Delivered green hydrogen has meanwhile provided supply to the station. For the Sisu trial, this is important because hydrogen availability is not simply a future assumption. Researchers can evaluate the truck against real refuelling infrastructure and real fuel logistics, exactly where promising technology often encounters its hardest practical questions.
A Digital Twin Will Follow the Physical Truck
The Sisu will effectively travel with a digital shadow. VTT says vehicle data will be collected continuously and used with a digital twin, allowing researchers to compare what the physical truck is doing with a virtual representation of its operation. Energy consumption, reliability, weather effects and practical limitations are all part of the monitoring plan. Instead of judging success from a handful of carefully controlled demonstration runs, the team is trying to build a detailed picture of repeated daily use over several months.
Economics are part of that picture from the beginning. VTT says electricity and hydrogen price data will be used to determine how much energy should be loaded and where, and the results will be benchmarked against diesel vehicles. An academic ESCALATE total-cost-of-ownership study takes a similarly broad view, accounting for vehicle capital cost, battery and fuel-cell equipment, charging infrastructure, energy, service and maintenance, and driver labour. That matters because a cheaper kilometre cannot be judged from fuel price alone. Downtime, infrastructure expense and vehicle utilisation can change the financial result just as decisively.
The Truck Already Completed a Battery-Only First Stage
The Sisu did not go directly from a workshop to a 540-kilometre winter route. Its first phase was a fully electric test in Kokkola, where KWH Logistics subsidiaries Rauanheimo and Adolf Lahti used the vehicle in real industrial work during spring 2026. The operation involved bag transport between a packing facility and port storage, a short and repetitive duty cycle very different from the long-haul assignment now planned between southern and central Finland.
That earlier phase gave the project a chance to study energy consumption, charging, regenerative braking, thermal management and driver experience before adding the complexity of hydrogen-supported long-distance work. KWH Logistics said its early observations were encouraging, particularly for industrial transport, where electric drive brought smooth power delivery, lower local emissions and reduced noise and vibration. The new trial raises the difficulty sharply. Instead of repeated short movements near a known charging location, the truck must cope with hundreds of kilometres, public-road scheduling, winter conditions, multiple energy sources and infrastructure spread along an entire freight corridor.
The Finnish Trial Sits Inside a €22.6-million EU Program
The truck is part of a much larger European research effort. ESCALATE is funded through Horizon Europe and, according to the European Commission’s CORDIS database, runs from January 2023 to March 2027. The project has a total reported cost of about €22.6 million, including roughly €16.6 million in EU funding. Its broader goal is to demonstrate zero-emission heavy-duty powertrains capable of long-distance work under real operating conditions rather than only proving concepts on test tracks.
CORDIS sets an ambitious benchmark: at least 500 kilometres of average daily operation for six months or more, alongside project-level development goals of roughly 800 kilometres without refuelling or recharging. It also describes five pilots, five digital twins and five total-cost-of-ownership case studies. The Sisu’s planned 540-kilometre day therefore lands directly inside the program’s real-world duty target. More importantly, the Finnish pilot contributes an unusually demanding use case—heavy Nordic combinations, winter conditions, battery charging and hydrogen refuelling in the same operation. Its failures could prove as valuable as its successes by identifying what future production vehicles still need changed.
The Real Commercial Question Comes After the Winter
Sisu Auto has been careful not to present the Escalate as a finished commercial vehicle. The company says the truck is a technology test bed whose lessons will help it choose components and energy-management strategies for a future product series. Its stated priority is to maximise the distance driven using battery electricity and deploy hydrogen strategically, with Sisu noting that hydrogen is the more expensive fuel. The experiment is therefore less about declaring one technology the winner than finding a combination capable of keeping a heavily loaded truck productive at an acceptable cost.
The pressure to solve that problem is growing. Current European heavy-duty vehicle standards call for manufacturers’ fleet-average CO2 emissions to fall 45% from the applicable baseline by 2030, 65% by 2035 and 90% by 2040. For freight operators, however, regulation does not move cargo; dependable trucks do. After the six-month trial, the most valuable results from Finland will be figures on uptime, energy consumption, winter reliability, charging behaviour, hydrogen demand and cost. If those numbers work together, the Sisu experiment could help turn unusual research hardware into technology suitable for trucks that fleets can eventually buy.
