Transformer and Switchgear Lead Times for Data Centers

A data center campus served at transmission voltage needs a substation: high-voltage breakers, disconnect switches, protection and control, and one or more large step-down transformers. Behind the substation sit medium-voltage switchgear, unit substations and the facility’s own distribution. None of it is off-the-shelf at the sizes a large campus needs.

For most of the last decade, transformers and breakers were ordered after the design was fixed and arrived well before the building was ready. That order of operations no longer works. Lead times for some high-voltage transformers have gone from around a year in 2020 and 2021 to multiple years, and utilities and developers are locking in orders far in advance.² Equipment can now be the longest item on the schedule, longer than the utility load study or the building itself.

The practical consequence for site selection is simple. A site’s power date is only as good as the equipment plan behind it. A utility may be able to serve a load in two years on paper, but if neither the utility nor the developer holds a manufacturing slot for the substation transformers, that date is a hope, not a schedule. Our guide to the energization timeline shows where equipment sits in the overall sequence.

The most widely cited figures come from Wood Mackenzie’s quarterly supply chain survey. As of its second-quarter 2025 survey, power transformers averaged 128 weeks from order to delivery and generator step-up (GSU) transformers averaged 144 weeks.¹ Unit prices had risen 77% for power transformers and 45% for GSUs since 2019.¹

Averages hide a long tail. In 2026, analysts cited by pv magazine described lead times for high-capacity units stretching to as long as four years.³ Extra-high-voltage units, custom impedances and nonstandard ratings sit at the long end. Smaller distribution-class units are shorter but have not been immune: NREL found utilities reporting distribution transformer lead times of up to two years, about four times pre-2022 norms, with prices up as much as four to nine times over three years.⁴

Breakers and switchgear follow the same pattern with a lag. Reuters reported in July 2026 that while large power transformers show the most pronounced shortage, data center construction is driving demand for circuit breakers and switchgear that are set to face larger market deficits.² Wood Mackenzie data in the same report put high-voltage circuit breaker lead times at 125 weeks in late 2025, up from 77 weeks in 2023, and generator step-up transformer waits above 160 weeks by early 2026.² Lead times for medium-voltage switchgear built to data center specifications vary widely by manufacturer, so quotes should be gathered for the actual design rather than taken from a rule of thumb.

The shortage is a demand shock meeting a thin, slow-to-expand supply base. Wood Mackenzie estimates U.S. demand for power transformers rose 116% and demand for GSUs rose 274% between 2019 and 2025, while domestic manufacturing capacity could not keep pace.¹³ Imports supply an estimated 80% of U.S. power transformers and 50% of distribution transformers.¹

Several causes compound each other. NREL attributes the shortages to pent-up post-pandemic demand, difficulty recruiting and keeping a skilled workforce, component supply problems and shortages of materials such as grain-oriented electrical steel, aluminum and copper.⁴ GAO found that utilities ranked supply chain constraints, including long and increasing lead times, limited factory capacity and labor and material shortages, as their most pressing transformer challenge.⁵

Large power transformers are also heavy, custom and expensive. GAO reported that they can cost as much as $10 million to buy and hundreds of thousands of dollars to move.⁵ Because units are engineered for their systems, the lack of standardization makes spares hard to pool, one reason stakeholders told GAO that a federally owned reserve would be difficult.⁵ DOE’s 2024 report to Congress instead emphasized industry-held surplus and reserve units.⁶ Data center demand adds to all of this: Wood Mackenzie analysis cited by Reuters projects U.S. data center capacity rising from about 24 GW to 110 GW by 2030.²

Manufacturers are adding U.S. capacity, but transformer plants take years to build and ramp. Hitachi Energy announced a $457 million large power transformer facility in South Boston, Virginia, which it describes as the largest U.S. site for that equipment.⁷ pv magazine reported in May 2026 that the South Boston plant is scheduled to come online in 2028 and that Siemens has raised its commitment for a Charlotte, North Carolina transformer factory to $421 million.³ Siemens Energy has targeted the start of U.S. large power transformer production in 2027.⁸

Even with these investments, the supply and demand imbalance is expected to persist for years.³ Wood Mackenzie estimated a 30% supply deficit for power transformers in 2025.¹ For a project seeking power in the next few years, the planning assumption should be that today’s lead times apply, and that any improvement is upside.

Equipment lead time interacts with every other step in the power process. A typical failure mode is sequential thinking: wait for the load study, then sign the service agreement, then design the substation, then order the transformers. Run in series, a 2.5-year transformer lead time lands on top of the study and design time instead of running alongside it.

Lead times also shape how a ramp schedule is built. Many campuses energize a first phase on one transformer and add units as load grows, which spreads equipment orders over time. Our guide to load ramps and phased power covers that approach. Others use bridge power while grid equipment is on order, though on-site generation needs its own step-up transformers and switchgear, which are among the tightest categories.¹

When comparing sites, equipment readiness can tip the balance. A site where the utility already has a substation expansion and transformer on order may beat a site with more theoretical headroom but no equipment plan. Ask what is already on order, not only what is possible. Our guide on substation proximity and capacity covers the other half of that question.

No strategy removes lead time, but several reduce how much of it lands on the critical path.

• Settle ownership early. Decide with the utility which equipment it buys and which you buy. The answer depends on whether the substation is utility-owned or customer-owned, and it determines who carries the order risk.
• Reserve manufacturing slots. Many manufacturers accept reservation or capacity agreements before final design. The deposit is at risk if the project stops, so weigh it against the value of the schedule.
• Use standard ratings. Matching the utility’s standard transformer sizes, voltages and impedances widens the pool of suppliers and makes spares and substitutions easier.⁵
• Order for the program, not the building. Hyperscale developers with several campuses increasingly buy in volume and assign units to sites as they are ready, a practice Reuters describes as locking in orders far in advance.²
• Plan spares. A failed transformer at a single-transformer substation can mean years on generators or a temporary unit. DOE and industry have emphasized keeping surplus or reserve units for exactly that reason.⁶
• Mind the contract. Price escalation, committed delivery dates, factory acceptance testing and liquidated damages terms matter more when delivery is two to four years out.

Costs of utility-procured equipment are often charged to the customer up front, as contribution in aid of construction or under a facilities agreement. A utility may also require financial security before it places an order on a customer’s behalf, so equipment timing and the electric service agreement are linked. Confirm the specific terms with the utility and an electrical engineer.

1. 01Does the utility’s proposed service plan require a new or expanded substation, and how many transformers and breaker positions does it need?
2. 02Which of that equipment is already on order, and for which delivery date?
3. 03Who will buy each major item: utility, developer, or a mix? Who holds the manufacturing slot?
4. 04Does the plan rely on standard utility ratings, or on custom units with fewer suppliers?
5. 05What is the spare strategy if a transformer fails before or after energization?
6. 06If on-site generation is part of the plan, what are the quoted lead times for its step-up transformers and switchgear?

The answers turn a utility’s capacity statement into a dated plan. When we screen a site, equipment readiness is part of the power analysis, not an afterthought. If you have a parcel and a utility conversation under way, you can get a site reviewed or read our broader guide to the data center equipment supply chain.