Summary
- The proposed Huuhansuo development could provide up to 480MW of IT load across approximately 105 hectares.
- Its energy infrastructure could include 200MWp of solar, 320MW/2,560MWh of battery storage, and up to 720MW of gas generation.
- The project remains subject to environmental assessment, planning, investment, and operator selection, with no first phase expected before 2029.
3Flash Finland is proposing a data centre campus with up to 480MW of IT load in Lappeenranta, incorporating solar generation, battery storage, and gas-fired power infrastructure into the development plans.
The project would occupy up to approximately 105 hectares at Huuhansuo, southwest of the city. Alongside the computing facilities, the developer is considering a solar installation of up to 200MWp, battery storage rated at 320MW with 2,560MWh of energy capacity, and a gas-engine power plant of up to 720MW.
These figures are proposed design limits. They do not represent installed equipment, secured generation capacity, or data centre infrastructure currently operating at the location.
The environmental assessment will also consider a smaller development option. The eventual project configuration has not been decided, while the developer continues to seek a data centre operator and investor.
The proposed site includes former peat production land and commercial forestry. It is close to electricity and gas infrastructure, including Fingrid's Yllikkälä substation and a Gasgrid transmission pipeline.
Physical proximity to those networks could assist future development, but it does not establish that grid import capacity or fuel delivery arrangements have been secured.
3Flash aims to complete permitting in 2028, with the first operating phase possible in 2029 at the earliest. Environmental impact assessment and local planning remain necessary before that timetable can become a committed construction programme.
Generation and storage are central to the proposal
Large computing facilities typically require continuous electricity supply, while their supporting cooling and electrical systems add to the total facility demand. The proposed 480MW figure relates to IT load and should not be treated as the campus's total electricity requirement.
The developer intends to combine electricity drawn from the network with its own generation and storage equipment. Gas engines could provide dispatchable output during periods when renewable generation is insufficient or network supply is constrained.
The proposed generation capacity is substantial relative to the IT load, although the system's operating regime will depend on the final design and applicable permits.
Gas generation introduces fuel supply and emissions requirements that are separate from the data centre's electricity consumption. The developer has indicated that engines could use natural gas, biomethane, and certain hydrogen blends, but that capability is not evidence of a secured low-carbon fuel supply.
The planned solar installation would add renewable generation, although 200MWp represents peak capacity under specified conditions rather than constant electricity output.
Battery storage could provide flexibility when generation or demand changes. At the proposed maximum rating, 2,560MWh divided by 320MW gives a nominal eight-hour discharge duration at full output, before operating limits and conversion losses.
Such storage could help manage short periods of imbalance but would not independently supply the full computing campus indefinitely. A sustained electricity requirement would still depend on other generation or grid imports.
The design therefore involves several interacting systems whose operational performance cannot be inferred from their individual maximum ratings.
Permitting will determine the feasible scale
The environmental assessment must address the effects of construction and operation across the site, including land use, noise, emissions, water, and the proposed energy infrastructure.
The developer says it intends to use closed-loop cooling without taking cooling water from nearby rivers or lakes. Actual water use and the environmental consequences of the chosen cooling design will require assessment as the project develops.
The operating regime of the gas engines is another central question. Equipment used occasionally for backup or flexibility services would have different fuel consumption and emissions from a plant running for extended periods to supply the campus.
Those differences could influence environmental permitting, electricity costs, and the commercial assumptions supporting the investment.
Finland has attracted growing interest in data centre development because of its climate, electricity infrastructure, and available industrial locations. However, the feasibility of an individual project still depends on a reliable power strategy and the availability of capital and customers.
Huuhansuo combines several proposed approaches to electricity supply, but none eliminates the need to establish the final operating model. The environmental assessment, network arrangements, and commercial agreements will determine how much of the proposed capacity can proceed.
With the first phase targeted for 2029 at the earliest, the immediate milestones concern permitting and project financing rather than the commissioning of data centre capacity.
