Data‑centre builds are hitting physical and political limits

The great AI build-out in the United States has run into something more stubborn than capital. It has run into steel, copper, batteries, zoning boards, and the electric grid. Developers still want to pour hundreds of billions of dollars into new data centers, but a surprising share of the projects announced for 2026 are not becoming buildings. Analysts cited by Bloomberg estimate that 30% to 50% of planned U.S. AI data-center capacity this year will be delayed or canceled, largely because the industry cannot get enough transformers, switchgear, and batteries on time. Only a fraction of the capacity announced for the next few years is actually under construction. (finance.yahoo.com) That bottleneck is easy to miss because the shortage is not in glamorous AI hardware. It is in the electrical gear that sits around the servers and between the site and the grid. Data centers need large transformers to step power up and down, switchgear to route it safely, and battery systems to bridge outages and smooth operations. Those same components are also being chased by utilities, factories, renewable-energy projects, and the broader electrification boom. EPRI warned last year that data-center growth is colliding with aging infrastructure, concentrated manufacturing, and geopolitical supply risks across the power supply chain. (epri.com) The timing makes the shortage worse. AI developers want new capacity fast. Electrical manufacturing does not move fast. EPRI says new data-center connections already face lead times of one to two years, and that is before the site has secured all of its equipment. Reuters reported in late March that utilities and regulators are now pressing data centers to become flexible loads that can cut consumption during periods of grid stress, a request that would have sounded absurd a few years ago. The industry built these facilities to run flat out. The grid is now telling them to behave more like interruptible demand. (restservice.epri.com) Imports have become the escape hatch, and that is where the politics snap into the engineering story. Bloomberg reported that U.S. developers have leaned harder on foreign suppliers because domestic production of high-power transformers, switchgear, and batteries is not enough. Wood Mackenzie data cited in that reporting showed imports of high-power transformers from China rising sharply between 2022 and 2025. New tariffs now threaten to raise the price of the very components developers turned to when domestic supply fell short. A project can survive expensive GPUs. It cannot open without basic electrical equipment. (finance.yahoo.com) Even if the parts arrive, the next obstacle is local permission. State lawmakers have started treating data centers less like harmless digital infrastructure and more like giant industrial loads with tax subsidies attached. Axios reported on April 5 that states with active legislation or filed statewide moratoriums now include Georgia, Maine, Maryland, Michigan, Minnesota, New Hampshire, New York, Oklahoma, South Carolina, Vermont, and Virginia. NCSL and Stateline separately reported that lawmakers in at least 11 states have introduced temporary-ban bills this session, driven by worries about electricity prices, water use, land use, and environmental impacts. (axios.com) That list matters because it shows the backlash is not regional and not ideological. Virginia is the country’s data-center capital, and EPRI projects that data centers there could account for 39% to 57% of electricity demand by 2030 if current development continues. By the same horizon, seven more states could see data centers take more than a fifth of statewide electricity use. Nationally, EPRI’s latest scenarios put data centers at 9% to 17% of U.S. electricity generation by 2030. Once those numbers enter local politics, permitting stops looking like a formality and starts looking like a power-allocation fight. (powering-intelligence.epri.com) So the underwriting model for an AI data center is changing in plain sight. The risk is no longer just whether demand for compute will justify the building. It is whether the developer can secure a transformer, a battery system, a grid interconnection, and a political path through a statehouse or county board before the economics change again. In Maine, one of the bills under debate would pause construction of large new data centers until November 2027. That is what the new constraint looks like: not a software problem, but a calendar date written into law. (msn.com)