Transformer lead times in 2026, and every other long-lead item on a data center build

Morsa publishes this guide. Morsa is software with an AI agent that works in your ERP and email; it chases long-lead vendors for their dates, and a person approves what goes out.

Quick answer

• The row to use: substation transformer, 25 to 50 MVA, 85 to 110 weeks. Above 50 MVA, Terrapin publishes only 100 to 150+ weeks; get a dated quote and plan on 150 [3].

• The order-by rule: latest PO = energization minus 132 weeks (about 2.5 years) for a 25 to 50 MVA unit, and minus 172 weeks (about 3.3 years) above 50 MVA, planning on 150 weeks. The worked example below shows the arithmetic.

• The other long lead items: medium-voltage switchgear 52 to 80 weeks (38 kV: 78 to 104), diesel generators of 1.5 MW and up 50 to 110, data center UPS 30 to 60 [3].

• The survey headline, 128 weeks for power transformers [1], is utility gear, not the data center row.

Lead times by equipment, with source and date

Weeks run from order or from release to manufacture, depending on the vendor; ask which.

Wood Mackenzie surveys utility transmission and distribution gear; Terrapin’s ranges are data center configurations quoted against live 2026 factory slots, so plan a data hall on Terrapin’s. Archdesk’s chiller and busway ranges come from equipment-maker rep reports, not a survey: get a dated quote, and ask which frame size ships soonest.

Why they are long

• Demand outruns factories. Wood Mackenzie put US power transformer supply 30% short of demand in August 2025 [5].

• One domestic source of transformer steel. The US has a single domestic maker of grain-oriented electrical steel, so most transformer makers buy steel or cores abroad [5].

Plan this build on today’s numbers. Terrapin does not expect meaningful easing before 2028 [3].

Who buys the main transformer

• Utility-owned substation: the utility designs, buys, builds and runs it under its tariff or a special facilities agreement. The developer can push on schedule but cannot speed up gear the utility has not ordered [6].

• Customer-owned substation: the owner funds and buys the transformer, usually to the utility’s specification. The owner gets control of the slot and takes on the engineering and testing [6].

• The utility’s queue comes first either way: JLL, cited by Build, puts average grid connection waits in primary markets above four years [6]. Its interconnect study sets the transformer’s size and voltage, so engage it in schematic design [3].

For a first check on size, use the transformer sizing calculator.

How to plan around them

1. Order by project type. Terrapin’s rule: a 50 to 200 MW hyperscale campus orders its electrical gear at land close; a 10 to 50 MW colocation site in preconstruction [3].

2. Reserve factory slots. Most makers hold a production slot for 10 to 30% of equipment cost. Without one, the lead can stretch another 8 to 16 weeks once the design is final [3].

3. If the owner has not bought yet, ask them to, as owner-furnished equipment assigned to you and the electrical subcontractor later.

4. Freeze what decides the slot first: voltage class, bus rating, fault rating, impedance and footprint. Leave paint, monitoring and relay settings for later hold points with dated deadlines [7].

5. Name approved alternates before you need them, such as Cummins or MTU on a Caterpillar-specified generator [3].

6. Get the slot in writing: a dated factory slot letter and a manufacturing schedule back to the ship week [7]. After award, get every date confirmed the same way and stop chasing by phone.

Worked example: order-by dates for an early-2029 campus

A 60 MW campus targets energization, meaning permanent utility power on, on Monday 2 April 2029.

Our assumptions: each lead time is the top of its range and runs from release to manufacture (RTM), the day the factory starts building after you approve the submittal drawings. Submittals take 8 weeks, transit 2. Gear lands in time to set, terminate and test: 12 weeks before energization for transformers, chillers and busway, 10 for switchgear and pad-mounts, 6 for generators and UPS.

Latest PO = energization date, minus the on-site buffer, minus 2 weeks of transit, minus the lead time, minus 8 weeks of submittals

• On these assumptions, both transformer dates have passed as of 8 November 2026: the 25 to 50 MVA unit by 7 weeks, a unit above 50 MVA by 47. The options: buy a held slot or a standard design already in a maker’s queue, ask the utility to supply the unit, or energize the first hall on a smaller unit and move the rest.

• A 60 MW campus buys several of each item. Ask for the ship week of the last unit in the order, not the first.

• Every other date is a ceiling. Place each PO about 8 weeks earlier, the size of one ordinary slip: in Archdesk’s worked case a switchgear ship date moved from week 58 to 66 [7].

Keeping long-lead dates current after the PO

Morsa works in your ERP (SAP, Oracle, Viewpoint Vista or Business Central), Procore and the buyer’s inbox.

1. It reads each long-lead PO and its milestones: submittals, RTM, factory acceptance test, ship and delivery.

2. Each week it asks every vendor for those dates from the buyer’s own mailbox and reads the replies. The buyer approves each kind of message once; after that it runs under that rule.

3. When a date moves, it shows what the slip hits (“switchgear lineup 2 ships 6 weeks late; float to energization falls from 8 weeks to 2”) and drafts the decision for the project manager to approve.

To see it on your own long-lead log, book a 30-minute walkthrough.

What to do this week

1. List every item on your build with a lead time over 20 weeks.

2. Put each one through the formula above and mark any PO date that has passed.

3. Ask the owner whether the utility or the owner buys the main transformer, and whether it is on order.

4. For each passed date, ask two makers for a dated slot letter on a standard design.

5. Ask every open-PO vendor in writing whether their lead time runs from the PO or from RTM.

To run these dates on your own project, with each vendor’s promised date and the float per item, use the free long-lead equipment tracker.

Sources

1. Wood Mackenzie Supply Chain’s Lead Time Benchmarking Product, in Making the connection: meeting the electric T&D supply chain challenge, executive summary with American Clean Power (September 2025), page “Equipment lead times remain volatile”: https://www.powermag.com/wp-content/uploads/2026/01/making-the-connection-executive-summary-september-2025.pdf (read 8 November 2026)

2. Reuters, Kavya Balaraman, US power companies face transformer waits as data center demand surges (9 July 2026), quoting Wood Mackenzie: https://coloradobiz.com/us-power-companies-transformer-waits-data-center-demand/ (read 8 November 2026)

3. Terrapin Construction Group, Switchgear, Transformer, and Generator Lead Times in 2026 (10 June 2026, updated November 2026; from active manufacturer slot reservations): https://terrapincg.com/news/switchgear-transformer-generator-lead-times-2026 (read 8 November 2026)

4. Archdesk, 2026 US data center construction (16 April 2026), Exhibit 6, from 2024 to 2026 OEM rep lead-time roundups and contractor buyout logs: https://archdesk.com/blog/2026-us-data-center-construction (read 8 November 2026)

5. Wood Mackenzie, Transformer troubles: manufacturing and policy constraints hit US transformer supply (13 August 2025): https://www.woodmac.com/news/opinion/transformer-troubles-manufacturing-and-policy-constraints-hit-us-transformer-supply/ (read 8 November 2026)

6. Build, Data center substation development: site criteria, utility coordination and delivery risk (27 May 2026), citing JLL’s 2026 Global Data Center Outlook: https://build.inc/insights/data-center-substation-development (read 8 November 2026)

7. Archdesk, Ultimate Guide to Managing Long-Lead Equipment in Data Center Builds (26 June 2026, updated 9 August 2026): https://archdesk.com/blog/guide-to-long-lead-data-center-equipment (read 8 November 2026)