# MEP & electrical contractors (self-perform)

Part ID: 9.05 · Layer 9 (Building shell, site & construction)

Self-performing MEP and electrical contractors who install the power distribution, cooling piping, and electrical systems specified by design (9.03) under the general contractor's coordination (9.04).

Where Layer 9.04's general contractor manages the overall build, the trades in this layer do the hands-on installation of the electrical switchgear, cabling, cooling piping, and mechanical systems that turn the shell into a working data center — installing the hardware that Layers 5 through 8 of this taxonomy manufacture. "Self-perform" distinguishes firms that do this work with their own crews from those that only broker it out, which matters for schedule control on projects where the electrical and mechanical scope is the critical path.
Higher-density AI racks mean more electrical capacity and more liquid-cooling piping per square foot than a comparable enterprise build, which increases the skilled-labor hours needed per project even before accounting for the larger total footprint of AI campuses. Skilled electrical and mechanical labor availability is the constraint most consistently named at this layer — a shortage that doesn't scale down with automation the way some other parts of construction can, since this is licensed, on-site trade work. Investors should watch labor pipeline and backlog at the firms with data-center-specific self-perform crews rather than at generalist electrical contractors.

**AI delta:** Higher-density AI racks require more electrical capacity and more liquid-cooling piping per square foot than a comparable enterprise build, raising skilled-labor hours per project.

## Companies

| Company | Role | Confidence | Ownership | Ticker | Note |
|---|---|---|---|---|---|
| Comfort Systems | contractor | inferred | public | FIX |  |
| Cupertino Electric | contractor | inferred | subsidiary |  |  |
| EMCOR | contractor | inferred | public | EME |  |
| IES Holdings | contractor | inferred | public | IESC |  |
| Limbach | contractor | inferred | public | LMB |  |
| Southland | contractor | inferred | public | SLND |  |
| Sturgeon | contractor | inferred | subsidiary |  |  |
| Bergelectric | contractor | inferred | private |  |  |
| Cache Valley Electric | contractor | inferred | private |  |  |
| Dornan | contractor | inferred | private |  | region: Ireland and EU data-center specialists |
| Dynamic Systems | contractor | inferred | private |  |  |
| Faith Technologies | contractor | inferred | private |  |  |
| Guarantee Electrical | contractor | inferred | private |  |  |
| Harris | contractor | inferred | private |  |  |
| Helix Electric | contractor | inferred | private |  |  |
| Jones Engineering | contractor | inferred | private |  | region: Ireland and EU data-center specialists |
| Kirby | contractor | inferred | private |  | region: Ireland and EU data-center specialists |
| Ludvik | contractor | inferred | private |  |  |
| McKinstry | contractor | inferred | private |  |  |
| Mercury | contractor | inferred | private |  | region: Ireland and EU data-center specialists |
| Miller Electric | contractor | inferred | private |  |  |
| MMR | contractor | inferred | private |  |  |
| Rosendin | contractor | inferred | private |  |  |
| TDIndustries | contractor | inferred | private |  |  |
| Winthrop | contractor | inferred | private |  | region: Ireland and EU data-center specialists |

Confidence tags: disclosed = company/filing statement; reported = trade press or partner list; inferred = taxonomy lead.