Who makes mv switchgear, e-houses, power skids for AI data centers

MV switchgear takes power handed off from the HV side (7.02) or from step-down transformers (7.04) and distributes it across a campus's buildings and yards. Packaging that switchgear into an E-house — a pre-fabricated, walk-in enclosure built and tested off-site — or a smaller power skid lets it be manufactured in parallel with civil construction and craned into place largely finished, which shortens the critical path compared with building an electrical room on site. This modularity has made E-houses a default choice for large, fast-moving campuses even though it adds a factory step and a shipping and rigging logistics chain that a stick-built room does not need. Downstream, an E-house typically feeds MV/LV transformers and LV switchgear serving individual halls or buildings, so its capacity and the number of feeder positions it is built with set a ceiling on how much can be added later without a new E-house. Investors should watch factory capacity and backlog at the firms that build E-houses and skids, since that fabrication step — not the switchgear itself — is often the binding constraint, along with how much of the enclosure and integration work incumbents keep in-house versus outsource.