Hitachi Energy has published a perspective on data center site selection under grid constraints, arguing that power availability — not real estate, fiber, or tax incentives — is now the deciding factor for where hyperscale and colocation campuses can be developed. The piece, dated 28 May 2026, frames the electrical grid as the pacing item for the industry’s AI-driven buildout.
Executive Summary
The message from Hitachi Energy, a major supplier of high-voltage transformers, switchgear, and grid automation, is that the data center industry’s traditional site-selection playbook is breaking down. Where developers once optimized for cheap land, fiber routes, and state tax abatements, they are now confronting multi-year interconnection queues and utilities that simply cannot deliver hundreds of megawatts on the timelines AI workloads demand.
The perspective matters because Hitachi Energy sits on the supply side of that bottleneck. Transformers and high-voltage equipment now carry lead times measured in years, and the company’s public framing signals both a diagnosis of the problem and a positioning statement: that early utility engagement, grid-aware siting, and integrated power design are becoming prerequisites, not enhancements, for getting a campus energized this decade.
Power Has Replaced Land as the Binding Constraint
For most of the cloud era, data center site selection followed a familiar checklist: proximity to fiber routes, favorable tax treatment, low natural-disaster risk, and access to water for cooling. Power was assumed. That assumption has quietly collapsed. A single AI training campus can now request 500 megawatts or more — comparable to the load of a mid-sized city — and utilities across North America and Europe are responding with interconnection studies that stretch four to seven years. Hitachi Energy’s framing acknowledges what developers already know privately: the binding constraint is no longer where you can build, but where the grid can actually deliver electrons.
Why a Transformer Vendor Is Talking About Siting
Hitachi Energy is not a neutral commentator. As one of a small handful of global suppliers of large power transformers, high-voltage switchgear, and HVDC (high-voltage direct current) systems, the company is directly exposed to the buildout it is describing. That is not necessarily a problem — the firms that make the equipment often see the pipeline earliest — but readers should weigh the perspective accordingly. The commercial subtext is that operators who engage grid-equipment suppliers early in siting, rather than after a lease is signed, can lock in delivery slots for gear that is genuinely scarce.
Winners, Losers, and the New Geography of Compute
If power is the constraint, the geography of the industry shifts. Traditional hubs like Northern Virginia and Dublin, where transmission is already saturated, become harder to expand. Secondary markets with underutilized generation — parts of the U.S. Midwest, the Nordics, and regions near stranded renewable output — become more attractive, provided the transmission math works. Operators willing to co-locate near generation, sign long-term power purchase agreements, or fund grid upgrades directly gain an edge over those still shopping for shovel-ready sites. Utilities, meanwhile, gain unusual leverage: they are effectively rationing a scarce good, and the terms they set will shape which hyperscalers and colocation providers can scale in a given region.
The Risk of Treating the Grid as a Marketing Story
The piece is a corporate perspective, not an engineering white paper, and it is fair to note what that format cannot do. It does not quantify how much of the current interconnection backlog is caused by equipment lead times versus utility planning cycles versus permitting, and those causes require different fixes. Framing site selection as primarily a siting-strategy problem risks understating the structural issues — transmission planning, permitting reform, and generation adequacy — that no single developer or vendor can solve on their own. The useful takeaway is directional: power constraints are now a first-order design input. The unresolved question is who bears the cost of fixing them.
Background
Hitachi Energy was formed in 2020 when Hitachi acquired a majority stake in ABB’s power grids business, creating one of the largest global suppliers of high-voltage equipment, grid automation, and HVDC transmission systems. The company sells primarily to utilities, transmission operators, and large industrial customers, and has increasingly turned its attention to data centers as their electrical demand has begun to rival that of heavy industry.
The wider context is a global grid under simultaneous pressure from AI-driven data center growth, the electrification of transport and heating, the retirement of legacy generation, and renewable integration. Transformer lead times, interconnection queues, and transmission planning have moved from back-office concerns to boardroom issues for hyperscalers, colocation providers, and their investors.
Data Center Knowledge reported on May 23, 2026, that AI inference — the day-to-day serving of trained AI models to end users — is pulling infrastructure investment back toward metro data centers, reversing years of momentum toward remote hyperscale campuses. The driver, per the report’s framing, is latency: inference workloads live and die by response time, and response time is a function of physical distance to users.
Executive Summary
The trade publication’s thesis is straightforward: the AI buildout’s first act was dominated by training — the compute-intensive process of creating models — which rewarded remote sites with cheap land and abundant power, because training does not care where it runs. The second act is inference, the phase where those models actually answer queries for businesses and consumers, and inference is latency-sensitive in a way training never was.
If the thesis holds, it matters for nearly everyone in the infrastructure value chain. Metro colocation operators, carrier hotels, and interconnection-rich urban facilities — assets many analysts treated as yesterday’s story during the gigawatt-campus land rush — would regain strategic relevance. Site-selection criteria, capital allocation, and power procurement strategies would all tilt back toward proximity to population centers, precisely where power and real estate are scarcest.
Training Built the Campuses; Inference Pays the Bills
Training and inference are economically different animals. Training is a batch job: it runs for weeks or months, consumes enormous power, and produces a model. Because no end user is waiting on it in real time, operators could chase the cheapest available megawatt — which pushed campuses into rural and exurban regions with land, transmission access, and accommodating utilities. Inference is the opposite: it is the recurring, revenue-generating workload, triggered every time a user prompts a chatbot, a copilot drafts an email, or an application calls a model behind the scenes.
As AI products mature from demos into production services, the share of total AI compute devoted to inference grows structurally. That shifts the industry’s center of gravity from “where is power cheapest?” to “where are the users?” — a question metro data centers were built to answer. The report’s framing suggests the market is beginning to price this in.
Why Latency Is Redrawing the Map
Latency — the delay between a request and its response — is bounded by physics. Data cannot travel faster than light through fiber, and every additional kilometer between user and server adds round-trip time. For a monthly batch job, that is irrelevant. For an interactive AI assistant, a fraud-check API, or a voice agent, tens of milliseconds are perceptible and, at scale, commercially meaningful.
Newer AI application patterns compound the effect. Agentic and multi-step systems chain many model calls together to complete a single task, so per-call latency multiplies. Retrieval-augmented applications shuttle data between models and enterprise systems that already live in metro colocation facilities. Placing inference capacity near users and near enterprise data reduces both delay and data-transit cost — a pull toward the very urban markets the hyperscale era had de-emphasized.
Winners, Losers, and the Assets in Between
The clearest beneficiaries of a metro revival would be operators holding interconnection-dense urban facilities: carrier hotels, established colocation campuses in major metros, and providers with existing utility relationships in constrained markets. Those assets are hard to replicate — urban land, fiber density, and grid connections accumulate over decades. Enterprises also stand to gain optionality, since inference capacity near their existing colocation footprints simplifies hybrid architectures.
This is not, however, a zero-sum reversal. Remote hyperscale campuses remain essential for training and for latency-tolerant inference, and the report’s headline says infrastructure is being pulled “back into” metros, not out of the hinterlands. The more defensible reading is bifurcation: a two-tier geography where massive remote campuses handle training and batch work while a distributed metro layer serves real-time inference. The open question is how capital gets split between the tiers — and whether metro grids can absorb their share.
The Constraint That Follows the Workload: Power
The uncomfortable irony is that inference demand is heading toward the places least prepared to power it. Major metros already contend with constrained grids, long interconnection queues, and community resistance to new data center construction. AI inference hardware, while less power-dense per site than a training cluster, still pushes rack densities well beyond what many legacy urban facilities were engineered for, often requiring liquid cooling retrofits and electrical upgrades.
That constraint cuts both ways. It limits how fast the metro shift can happen, but it also makes existing permitted, powered metro capacity more valuable — scarcity is a landlord’s friend. Expect the competition for metro megawatts, substation capacity, and retrofittable urban shells to intensify if the trend the report describes continues.
Background
Data center geography has swung on a pendulum for two decades. The early internet clustered compute in urban carrier hotels where networks met; the cloud era then pushed capacity outward to remote regions where land and power were cheap, and the AI training boom of the mid-2020s accelerated that outward push into multi-hundred-megawatt and gigawatt-scale campuses.
Data Center Knowledge, the source of this report, is a long-running trade publication covering the data center industry. Its May 2026 piece captures a question the industry has been circling as AI products move from development into production: once models are built, the economics of serving them — inference — may favor a very different map than the one training drew.
