IREN Buys Nostrum Group to Push Into European AI

IREN Nostrum Group acquisition is the clearest signal yet that this Bitcoin miner is done waiting for mining margins to recover. The company closed the deal on Monday, picking up a Spanish data center developer that brings 490 megawatts of secured grid-connected power, a build-out pipeline, and a team of more than 50 people across engineering, construction, and operations. Spain is not a random choice. It is, according to IREN, one of the most practical entry points into a European AI infrastructure market that is growing fast and still largely undersupplied.

What Did IREN Actually Buy?

Nostrum Group is a Spanish data center developer. Not a crypto miner, not a GPU cloud operator. A developer. That distinction matters because what IREN is paying for is not existing compute revenue but grid-connected land and permitting, the kind of capacity that takes years to secure in European markets where energy policy, zoning, and grid interconnect queues move slowly.

The IREN Nostrum Group acquisition adds approximately 490 megawatts to IREN's portfolio in Spain alone. Combined with existing holdings, the company's total secured power footprint is now around 5 gigawatts globally, with Spain representing roughly 10% of that total. That 5GW figure is a headline number IREN has been building toward for a while, and this deal puts it there.

The acquired team exceeds 50 employees across engineering, construction, development, and operations. That is not a huge headcount, but in data center development these are specialized roles that are genuinely hard to staff quickly. IREN co-founder and co-CEO Daniel Roberts framed the rationale plainly.

Europe is one of the largest and fastest-growing markets for AI infrastructure, and Spain is among its most compelling entry points.

The Revenue Numbers Tell a Specific Story

IREN's financials for the quarter ended March 31 are worth reading carefully because they show exactly where the business is heading. IREN AI cloud revenue came in at $33.6 million for the period, nearly doubling from $17.3 million the prior quarter. That is not a rounding-error kind of growth. That is a business unit accelerating.

Meanwhile, Bitcoin mining revenue fell from $167.4 million to $111.2 million over the same comparison period. IREN attributed the drop to lower average BTC prices and to the decommissioning of older mining hardware, which it is apparently retiring rather than maintaining. Mining is still the bigger number on the income statement, but the trajectory of both lines is unambiguous. AI cloud is climbing. Mining is shrinking. The gap is closing faster than most analysts had expected twelve months ago.

The GPU side of the business adds more texture. As of March 31, IREN had approximately 150,000 GPUs installed or on order. That is a serious compute footprint, and it is what makes the European expansion credible rather than aspirational. You need power to run GPUs at scale, and Spain gives IREN the power.

Bernstein analysts had already flagged the potential here. Their estimate, based on IREN's GPU capacity assumptions, was that the company's build-out could eventually support a Bernstein IREN GPU revenue forecast of $3.7 billion in annualized revenue. That is a long way from where IREN sits today, but it shows the range of outcomes that the market is pricing against.

Is This a Broader Trend Among Bitcoin Miners?

IREN is not the only Bitcoin miner pivoting toward AI infrastructure in Europe. HIVE Digital has been repurposing part of its Sweden facility for AI computing workloads. Bitdeer has been developing AI data center capacity in Norway, based on its investor communications. The pattern is consistent: miners who already control power infrastructure and own compute-facing real estate are finding it cheaper and faster to repurpose those assets for AI than to compete with hyperscalers from scratch.

The calculation makes sense on paper. Power availability is the binding constraint in AI infrastructure, and miners have spent years fighting for grid access. Repurposing that access for GPU workloads rather than ASICs is a capital efficiency argument, not a values shift. But the execution risk is real. AI cloud profitability is not automatic. It depends on utilization rates, customer contract structures, and what it actually costs to deploy and operate GPU systems at enterprise scale. Secured electricity is necessary but not sufficient.

For IREN specifically, the question the next few quarters will answer is whether AI cloud revenue keeps doubling or whether the growth rate normalizes as the easy early demand gets absorbed. The company has secured the power. It has the GPUs. Spain adds European capacity. What it still needs is a long-term contracted demand base that can hold up if BTC prices recover and the mining-versus-AI trade-off looks different in 2027 than it does today.

The Nostrum deal is a bet that the European AI market will continue to grow faster than mining margins will recover. That might be right. Given where Bitcoin mining economics sat for most of 2025, it is hard to argue the bet is irrational.