What it is
A Project Labor Agreement (PLA), sometimes called a Community Workforce Agreement, is a collective bargaining agreement negotiated before construction begins between a project’s owner (or general contractor) and a group of local building-trades unions. It sets the wages, benefits, work rules, and dispute-resolution procedures that will apply to everyone who works on that one project, for its duration, regardless of which company employs them.
The defining feature is that a PLA applies to the project, not to a particular company’s workforce. Any contractor can bid on the work, but once hired, that contractor’s crews must be staffed through union hiring halls and work under union terms for the life of the job. In exchange, unions typically agree not to strike or picket, which gives owners cost and schedule predictability on large, time-sensitive builds. PLAs have been used since the 1930s on major infrastructure — the Hoover and Grand Coulee dams, wartime shipyards — and the U.S. Supreme Court unanimously upheld their legality for government-sponsored projects in Boston Harbor (1993), on the theory that a government acting as a project owner, rather than as a regulator, can set contract terms like any other client.
Because PLAs route all hiring through unions, they mechanically exclude open-shop (nonunion) contractors and their workers from projects that require one — a fact that is the source of nearly all the policy controversy around them.
Why it matters for AI governance and narratives
Project Labor Agreements sit at the center of one of the AI buildout’s more consequential coalition dynamics: building-trades unions — electricians, pipefitters, laborers — have emerged as some of the most consistent public supporters of AI data center construction, at a moment when other constituencies (ratepayer advocates, environmental groups, host communities) are increasingly organizing against it. That support is not incidental. Massachusetts’s Healey-Driscoll administration now requires that data centers receiving public benefits be built under PLAs or comparable labor-peace agreements, effectively guaranteeing union labor a share of a multi-billion-dollar construction pipeline. This is why IBEW and pipefitters-union officials describe projects like the proposed $4 billion Westfield, Massachusetts complex as a “game-changer” rather than a threat.
That guarantee is also precisely what critics — including nonunion contractor associations — point to when arguing the policy is exclusionary: with only about 17 percent of Massachusetts construction workers belonging to a union, a PLA mandate concentrates public-benefit-linked work among a minority of the workforce, and disproportionately among white male union members relative to the state’s certified minority- and women-owned contracting base, most of which is nonunion. For an observatory tracking how AI is framed across ecosystems, PLAs are a useful case of a narrative fracture within a single stakeholder category — labor is not one voice on data centers, but two: organized building trades benefiting from mandated inclusion, and the larger nonunion workforce structurally locked out by the same policy.
Key facts and dates
PLAs are legally confined to construction projects, public or private, and have been federal policy footballs since the 1990s: Executive Order use of PLAs was banned under President George H.W. Bush (1992), restored under Clinton (1993), banned again under George W. Bush (2001), and encouraged again under Obama (2009, for federal projects over $25 million) and Biden (contracts of $35 million or more). As of the early 2020s, roughly half of U.S. states have banned government-mandated PLAs, while others, including Massachusetts, California, New York, and Illinois, actively encourage or require them.
On data centers specifically, the Healey-Driscoll administration’s 2026 “Statement of Expectations for Responsible Data Center Development” directs that projects receiving state tax benefits be built with PLAs or labor peace agreements, alongside requirements that developers fund their own energy infrastructure and support local hiring and apprenticeships. North America’s Building Trades Unions has separately partnered with Microsoft and OpenAI to train electricians and other crews for data center work nationally, and unions have negotiated labor agreements on marquee projects including the Oracle/OpenAI Stargate campus in Michigan and the “Project Blue” data center campus in Arizona.
Where to learn more
- Healey-Driscoll Administration Statement of Expectations for Responsible Data Center Development — the primary policy document establishing the PLA requirement
- Project Labor Agreement — Wikipedia — history, legal background, and summary of the cost/competition debate
- “Project labor agreements limit AI bonanza for state’s construction workers,” Boston Globe, Aug. 5, 2026 — the critical counter-view, with the 17.3% union-membership figure
- Massachusetts Building Trades Unions: Project Labor Agreements — the union movement’s own case for PLAs, including Massachusetts-specific bid-competition and workforce-diversity data