A hundred and fifty feet underground in an abandoned mine, near the cold waters of a beautiful fjord in Northern Norway, lies one of the world’s most unique data centers. Known for its exceptional energy efficiency, the Lefdal Mines Data Center has become the poster child of Norway’s expanding data center industry.

As the world’s hunger for AI grows, data centers such as Lefdal, Green Mountain, and Stack are emerging as front-runners in what is fast becoming a booming national sector. Google has invested €600M, while Microsoft and AWS continue to expand.

The reasons are clear: Norway offers a nearly 100% renewable-energy power grid, a cold climate, and frigid fjord waters that provide natural, energy-saving cooling.

Low environmental footprint—at least for now

The location of the Lefdal Mines Data Center—and its circular use of water resources—demonstrates how Norwegian data centers can sidestep the criticism that typically follows the industry elsewhere.

Data centers generally need enormous amounts of electricity, especially when handling AI workloads. They rely heavily on water to cool IT equipment and generate significant amounts of waste heat.

From waste heat to salmon farms

Lefdal Mines operates differently.

It is highly energy-efficient, drawing power exclusively from Norway’s renewable grid.

The data centers use cold fjord water to cool servers housed in the mine. The company also plans to reuse the heated return water to warm a proposed nearby salmon hatchery—an example of circular economy principles in practice and a model for cross-industry collaboration. The data center’s warm water would create ideal conditions for faster growth of salmon hatchlings.

For now, with the hatchery still awaiting approval, the heated water is returned to the fjord. At around 20°C—roughly 12°C above the ambient temperature—the discharge might raise concerns elsewhere. But with depths exceeding 400 meters and strong natural currents, the fjord can disperse the heat without environmental harm, according to Jørn Skaane, CEO of Lefdal Mines Data Center.

Breaking industry benchmarks

Because Lefdal uses power only for IT equipment, it achieves an exceptionally low guaranteed Power Usage Effectiveness (PUE) between 1.0-1.15 (depending on technical design) and a WUE (water usage effectiveness) of zero—two critical KPIs for sustainable data centers. And because it draws locally generated power, grid energy losses are minimal.

With such a low environmental footprint, Lefdal can offer cost-effective solutions to some of the world’s largest companies, while still having ample room for expansion.

The potential for industry growth toward circular data centers

Other Norwegian operators are following or proposing to follow similar circular principles.

Green Mountain is collaborating with what is reportedly the world’s largest trout farm, which will use the data center’s heated water. The cooled water will then be returned to Green Mountain’s facilities—a genuinely circular loop. Stack, meanwhile, is channeling its waste heat into district heating, providing warmth for 5,000 apartments in Oslo.

These examples show how Norwegian data centers are becoming strong models for the kind of cross-industry collaboration required to eliminate operational waste and reuse resources efficiently.

Catalyst for rural development

Lefdal’s Jørn Skaane even sees data centres as catalysts for development in remote areas, stimulating local industries and jobs.

The green and digital transitions that Norway has planned hold significant potential for sustainability, competitiveness, and value creation. Data centers can help reduce emissions across sectors through digitalisation, for example.

At the same time, the sector carries its own climate and environmental footprint through high power consumption and land use.

Much still depends on government approvals, many of which have been pending for years.

The power paradox: Can Norway’s grid handle the growth?

Norway already hosts more than 80 data centers, with many more planned as operators seek locations where they can meet carbon-compliance and circularity requirements cost-effectively.

But this raises an important question: what will this growth mean for Norway’s electricity consumption—and does the country have enough supply?

Racing against demand: The 2040 challenge

According to DNV’s report on Energy Transition, data centres will account for 7 percent of total electricity consumption by 2040.

Statnett, the state-owned transmission grid, admits that the grid capacity and future power balance are serious bottlenecks for the development of large-scale data centers. This constraint remains the main factor limiting the ability to meet rapidly growing demand.

Learning from success

Norway’s opportunity lies in showing that, with circular economy principles embedded from the start, data centers can grow without repeating the environmental mistakes seen elsewhere, and become part of a wider shift toward cleaner, smarter industrial development.