- A skilled-labor shortage is forcing craft-labor contractors that build data centers — including Sterling Infrastructure, MasTec, Quanta Services, EMCOR Group, and Comfort Systems USA — to turn away work or poach crews from smaller contractors to keep projects staffed; Comfort Systems CFO William George stated plainly on a recent earnings call: “There is plenty more work we could take if we could possibly do it,” while Sterling CEO Joseph Cutillo acknowledged the company is “stealing” crews from smaller shops.
- Electrical work accounts for roughly 50% of all labor on data center projects, and electrician wages are surging across all skill levels: overall US wages rose 2.4% year-over-year through May 2026, while hourly construction wages rose 3.4%; electrician-specific data shows 4.6% growth for general electricians, 6.6% for journeyperson electricians, 8.2% for apprentice electricians, and 9.9% for commercial electricians — a wage spiral that is compressing contractor margins even as their backlogs reach record levels.
- The structural mismatch is severe: electrical, plumbing, and HVAC employment has risen 30% since 2016, but the combined project backlogs at Comfort Systems, EMCOR, and Sterling have surged six-fold over the same period — a 6:1 demand-to-supply growth ratio that cannot be quickly resolved, since it takes four years of training to certify an electrician, and the construction sector faces an aging workforce, too few young people entering the trades, and insufficient apprenticeship and community college pipeline programs.
- Immigration enforcement is compounding the shortage: foreign-born workers account for 35% of the construction trades workforce — nearly double the 19% share across all industries — making the sector disproportionately exposed to deportations and work authorization restrictions; the largest contractors are responding by raising pay, leaning on union contractors and staffing firms, recruiting via social media and high-school outreach, and leveraging indoor prefabrication facilities to reduce on-site skilled-labor requirements.
What Happened?
Despite record order books and surging demand from hyperscalers pouring hundreds of billions into AI infrastructure, the craft-labor contractors that actually build data centers are hitting a hard ceiling: they don’t have enough electricians, pipe fitters, or site supervisors to take on more work. Bloomberg Intelligence analyst Scott Levine notes that forward-looking revenue growth estimates for major craft-labor suppliers are moderating — not because demand is cooling, but because labor supply is genuinely constrained. The bottleneck reflects systemic underinvestment in the skilled trades over the past two decades combined with a sudden explosion in data center construction spending, which eclipsed $50 billion in the US alone.
Why It Matters?
The labor constraint is a hidden speed limit on the AI infrastructure buildout that gets far less attention than chip shortages, permitting delays, or power grid constraints. Hyperscalers can commit $100 billion in capital expenditure and sign data center leases, but the physical construction depends on the availability of licensed electricians who can safely wire high-voltage power distribution in mission-critical facilities — a supply that cannot be rapidly scaled. The wage spiral is also significant: commercial electrician wages rising nearly 10% year-over-year represents a meaningful inflation input into data center construction costs, which are then passed through to hyperscaler capex budgets. For investors in craft-labor companies like EMCOR, Comfort Systems, Quanta, and Sterling, the labor constraint is a double-edged signal — it limits top-line revenue growth while supporting pricing power and margins for the work they can take on, since they can be selective about projects and customers.
What’s Next?
Watch whether the labor constraint begins to show up in data center completion delays — if hyperscalers’ AI infrastructure timelines slip due to contractor staffing shortages, it would be a meaningful negative for the AI capex cycle more broadly. The federal government’s immigration enforcement posture is a key variable: 35% of construction trade workers are foreign-born, and any acceleration in enforcement or work-authorization restrictions would further tighten an already constrained labor pool. The training pipeline is also worth tracking — apprenticeship enrollment in electrical trades has been rising, but with a four-year training cycle, the current cohort won’t be certified until 2029-2030. The silver lining is that contractors report some college graduates who can’t find knowledge-economy jobs are beginning to circle back to construction, but stigma and training requirements make this a slow-moving relief valve.
Source: Bloomberg
