Large power transformer
The high-voltage transformers that connect generation and large loads to the grid, now among the longest lead times in infrastructure.
A large power transformer steps voltage between transmission and distribution levels, and nothing connects to the grid at scale without one. They are custom-engineered for their position in the network, built by a small number of qualified plants, and weigh enough that moving one is a permitted transport operation in its own right rather than a delivery.
Demand for them changed shape rather than merely rising. Grid replacement work, renewable interconnection and data center construction now compete for capacity that was sized for a much slower replacement cycle, and the specialised inputs - grain-oriented electrical steel in particular - have their own concentrated supply. The result is quoted lead times measured in years.
For schedule modelling this is the canonical long-lead item of the current build cycle. A campus with power contracted and no transformer slot has a date decided by a factory queue rather than by its interconnection position, and the two are frequently tracked by different teams who reconcile once a quarter.
Evidence that keeps pace with the decision.
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