Most Americans hate data centers. The unions that build them don't.

On a recent weeknight in Westfield, Mass., the IBEW Local 7 business manager and a Plumbers and Pipefitters Local 104 representative stood before a City Council that had just voted unanimously for a one-year moratorium on new data centers, and made the case for a $4 billion Servistar Realties campus anyway. Across the country, the North America's Building Trades Unions, a 14-union alliance that includes the same electricians and pipefitters, has signed a training partnership with Microsoft and OpenAI to staff the AI data center buildout. Bipartisan polling cited by the Boston Globe shows most voters want those same projects paused. So does a pair of lawmakers who almost never agree: Sen. Bernie Sanders (I-VT) and Rep. Nancy Mace (R-SC).

The wire story is the permitting fight in Westfield. The structural fact is that construction unions are now Big Tech's most reliable ally on the physical infrastructure of AI, and the Westfield vote is the local expression of a national fight over who decides whether the AI build gets built.

AI data centers are physical plants: substations, switchgear, miles of conduit, water cooling, and the high-voltage rooms that an AI cluster needs to run. A single hyperscale campus can use as many electricians and pipefitters as a mid-sized hospital, all paid prevailing wage. To the trades, that mix is what a generational project looks like. The 2024 Massachusetts economic development law created a sales and use tax exemption that covers the equipment, software, electricity, and construction costs for a qualified data center, the policy mechanism that made the Servistar campus viable on a former industrial site in Westfield. Project records list Microsoft and Google among the hyperscale tenants Servistar is courting.

The Healey-Driscoll administration has put out a Statement of Expectations for responsible data center development that addresses grid load, water use, and siting, but it does not override local approval. The Westfield moratorium passed unanimously and does not unwind the Servistar project, leaving the city council in the awkward position of having told the developer no in general and yes in particular. The Yahoo News re-report of the Globe story covers the broader moratorium update; the original reporting on the politics is in the Globe.

The NABTU-Microsoft-OpenAI partnership is not a press release. It is a training program that takes apprentices in the electrical, plumbing, sheet metal, and operating-engineering trades and walks them through the specific switchgear, liquid cooling, and medium-voltage work that an AI hall requires. The same electricians who joined IBEW Local 7 in part because the local sends work to a union hall can now follow a documented path onto an AI build. For the trades, this is what a generational project looks like; for organized labor in entertainment and trucking, which has spent the last three years fighting AI on the output side, the trades are effectively choosing the build.

Data centers draw significant substation power and cooling water, and the cost shows up in residential electric rates and, in the right geography, in aquifer draw. The 14-union training partnership does not address any of this. It addresses the workforce. That is a deliberate scope choice, and it is the reason the political map is being drawn locally rather than nationally: the trades have the contractors and the apprentices to deliver the build, and the moratorium movement has the voters and a bipartisan quorum in Congress.

The first regional rate hike or well drawdown blamed on an AI data center will test the alliance. NABTU's training deal does not obligate Microsoft or OpenAI to defend any specific project. The strongest counterargument to the labor-AI inversion is that the trades are rent-seeking and would back any project that pays union wage, including a coal plant or a gas terminal; the falsifier would be a major building trade breaking ranks to back a moratorium, or NABTU exiting the Microsoft-OpenAI training deal. Neither has happened. The Westfield City Council returns from recess in September. Servistar is still moving dirt.