Europe's data centre bottleneck is the grid connection, not the building

A data centre takes one to two years to build. In Europe's main hubs, the grid connection it needs can take several times longer. The IEA puts connection waits across the EU at two to ten years, and at seven to ten years in the FLAP-D markets: Frankfurt, London, Amsterdam, Paris and Dublin. That gap now decides where, when and whether new capacity gets built.

I have watched the same queue from the generation side for years: utility-scale solar plants ready to build, waiting on a substation or a line upgrade. Data centres are now in that queue too, with one important difference. They need firm power, around the clock, from the day they open.

Why the grid has become the critical path

Three things have collided. First, timelines. A building and its electrical fit-out move on a construction programme measured in months. New transmission lines and substations move on a programme measured in years, slowed by permitting, transformer lead times and a shortage of skilled grid workers.

Second, location and size. Data centres cluster close to cities, fibre and each other, which is exactly where local grids are already full. And individual projects keep getting bigger: the IEA notes that planned Dutch projects are on average more than three times the size of those already operating.

Third, speculation. When capacity is scarce, developers file early and file large, and a queue fills with projects that will never be built. In Great Britain, contracted demand in the connection queue grew from 41 GW to 125 GW between November 2024 and June 2025, with around 50 GW of it linked to data centre schemes. That is more than the country's entire peak demand.

All of this sits uneasily with Europe's ambitions. The European Commission's AI Continent Action Plan targets a tripling of EU data centre capacity within five to seven years. The IEA's own modelling expects growth of about 70% by 2030, held back partly by exactly these grid delays.

Hub by hub

Dublin

Data centres used 22% of Ireland's electricity in 2024, and EirGrid's median scenario has that rising to 31% by 2034. EirGrid has effectively stopped accepting new data centre connections in the Dublin region until 2028. In December 2025 the regulator, the CRU, set the new rules for everyone else: data centres of 10 MVA or more must provide dispatchable on-site or nearby generation and/or storage matching 100% of their import capacity, and source at least 80% of their annual demand from new Irish renewables. In January 2026 the government added a plan-led approach, steering very large users towards green energy parks close to renewable generation.

Amsterdam

Amsterdam stopped construction of new large data centres in June 2025, and congestion across North Holland continues. In April 2026 a Dutch court allowed TenneT to pause a planned data centre connection in Haarlemmermeer because the grid there is full. Dutch grid operators say data centres now account for almost a third of the capacity requested on the national waiting list, and have asked the government to decide how many data centres the country should host, and where.

Frankfurt

In continental Europe's largest market, operators have already secured the power that is available in the city, and the local utility plans to double available capacity only during the 2030s. One regional grid operator has been telling new applicants to expect connections beyond 2032. Developers are responding by building their own supply: CyrusOne and E.ON plan a 61 MW gas plant alongside a new Frankfurt facility. Around Berlin, the regional operator has received 170 data centre enquiries totalling 22 GW since 2022.

London and Great Britain

The UK government says waits of up to 15 years have built up, driven by speculative applications. Ofgem is now proposing a refundable data centre commitment fee of £237,500 to £712,500 per MW, forfeited if a project leaves the queue before energisation, along with readiness milestones. Projects aligned with the government's AI Growth Zones and strategic plans are expected to be prioritised.

Four ways the rules are changing

1. From first come to first ready. The EU Grids Package of December 2025 pushes regulators to manage queues by project maturity rather than filing date. Great Britain is adding readiness tests and financial commitments specific to data centres.
2. Bring your own power. Ireland now requires it outright. In Germany, the market is arriving at the same answer with on-site gas generation.
3. Plan-led siting. Ireland's green energy parks, Britain's AI Growth Zones and the Dutch debate on where data centres belong all point the same way: capacity will be steered to where the grid and generation can support it.
4. Flexibility in exchange for speed. The IEA and Agora Energiewende both point to non-firm or flexible connection agreements: accept limited, pre-agreed curtailment and get connected sooner.

What this means if you are planning capacity

From my side of the table, six things now matter more than they did even two years ago:

1. Start with power, not land. Check substation headroom, the grid operator's published capacity information and realistic queue position before you option a site. A good plot with no deliverable megawatts is not a site.
2. Phase the connection. Apply for the capacity you can genuinely use in the first years and ramp from there. Oversized requests are exactly what regulators are now pricing and penalising.
3. Bring your own firm capacity. On-site or nearby generation with battery storage can bridge the years before full grid import, meet requirements like Ireland's, and earn flexibility revenue afterwards. In northern Europe, solar and storage alone will not carry a 24/7 load, so plan a hybrid and size the battery to the connection gap, not to the IT load.
4. Offer flexibility. Agreeing to curtail for a limited number of hours a year can move a project forward in the queue, and a battery makes that commitment inexpensive to honour.
5. Budget the connection as its own project. Commitment fees, queue milestones, reinforcement contributions and any required generation belong in the base-case financial model from day one, not in the contingency.
6. Look where the power is. The IEA highlights new hubs emerging in Spain and Finland. Beyond Europe, the Gulf and parts of Africa offer something the FLAP-D markets cannot: the chance to develop large-scale solar, storage and the data centre together, as one project.

That last point is the work I focus on at INSAIT: power strategy for data centres, from screening a site's grid position to designing on-site solar, battery and hybrid generation sized to the gap between what the grid can offer and what the facility needs. If your connection date does not fit your business plan, I would be glad to compare notes.

Talk about your project