The Senate Commerce Committee convened its first hearing on Wednesday on the Sanders-Ocasio-Cortez AI Infrastructure Moratorium Act, opening a high-stakes legislative fight that pits a bipartisan coalition of energy-anxious lawmakers against the largest concentration of corporate lobbying power Washington has seen since the 2018 tax debate.

The bill, introduced last Thursday by Senator Bernard Sanders of Vermont and Representative Alexandria Ocasio-Cortez of New York, would impose a three-year freeze on new permits for AI data centers drawing more than 100 megawatts of grid power and would require the Department of Energy to certify aggregate regional reliability before any moratorium lift. Senator Maria Cantwell, who chairs the committee, gaveled in shortly after 10 a.m. and devoted the first hour to testimony from state utility commissioners describing what one witness called “the most stressed twelve months on the American grid since deregulation began.”

Sanders, appearing as the lead witness, framed the measure as a response to compounding crises rather than a single one. “We are heating homes with natural gas that is now being priced for a war in the Persian Gulf, we are running cooling plants for data centers that did not exist three years ago, and we are asking working families in Ohio and Arizona to pay the bill for both,” he told the committee. “A pause is not radical. A pause is the minimum the country can afford.”

Ocasio-Cortez, who testified alongside him, emphasized the bill’s grid-reliability provisions over its symbolic weight. She pointed to a Federal Energy Regulatory Commission report issued in February that warned of capacity shortfalls in the PJM Interconnection by 2027, and noted that hyperscale operators had quietly throttled inference workloads last weekend to protect grid frequency in the Mid-Atlantic. “Industry has already admitted the math,” she said. “We are simply asking Congress to admit it on the record.”

The hearing room was unusually crowded. A coalition of technology trade groups, organized under the banner of the American Innovation Council, occupied two full rows of reserved seating and circulated a 38-page rebuttal memo that argued the moratorium would surrender American AI leadership to China and the United Arab Emirates within eighteen months. The council is funded by, among others, Microsoft, Alphabet, Meta, Amazon Web Services, Oracle and the data-center operator Equinix.

Industry pushback was carried into the hearing room by ranking member Ted Cruz of Texas, who used his opening statement to read aloud from a letter signed Monday by the chief executives of seven hyperscale companies opposing the bill. Cruz called the proposal “a permitting blockade in search of a justification” and warned that a freeze would strand more than $90 billion in announced capital expenditure across Virginia, Texas, Ohio and Iowa.

Witnesses for the industry side included Dr. Helena Voss, the chief grid strategist at the Edison Electric Institute, who argued the bill was poorly targeted. “There is a real reliability problem,” Voss testified. “There is not a credible case that a federal moratorium is the right instrument to solve it. The bottlenecks are transformer supply, transmission siting, and interconnection queues — none of which a permit freeze addresses.”

Counter-testimony came from John Reilly, a power-sector analyst at Citi, who told the panel that while the Voss critique was technically correct, it understated the political cost of inaction. “Residential rates in PJM are up 19 percent year-over-year, and the marginal load driver is AI,” Reilly said. “If Congress does not move, state public utility commissions will, and they will move messier.”

The political math in the chamber remains uncertain. Aides for at least five moderate Democrats — Senators Jon Tester of Montana, Mark Kelly of Arizona, Catherine Cortez Masto of Nevada, Raphael Warnock of Georgia and Jacky Rosen of Nevada — said their bosses had not yet committed either way and were waiting for the Congressional Budget Office to score the bill’s effect on data-center investment and on retail electricity prices. Three Republican senators have publicly indicated they would vote yes: Josh Hawley of Missouri, J.D. Vance of Ohio and Marsha Blackburn of Tennessee, each citing constituent rate pressure. Two independents, Angus King and Kyrsten Sinema, are considered likely yeses.

The administration’s posture has shifted notably over the past 72 hours. Energy Secretary Chris Wright, who initially called the bill “an own-goal” in a Sunday television interview, told reporters Tuesday evening that the White House was “open to a conversation about grid resilience” and had directed the National Economic Council to prepare a counter-proposal that would tighten interconnection standards without imposing a federal moratorium. A senior White House official, granted anonymity to discuss internal deliberations, said the shift reflected polling delivered to the West Wing late last week showing 61 percent support for “a temporary pause on the largest AI data centers” among likely voters in seven swing states.

Labor unions added their weight Wednesday afternoon. The AFL-CIO endorsed the bill at midday in a statement from President Liz Shuler, citing both energy costs for working families and the absence of meaningful project-labor commitments from hyperscale developers. The endorsement came with a carve-out: the federation said it would support the moratorium only if accompanied by accelerated permitting for grid-side transmission and battery storage projects, a provision Sanders aides said they would incorporate by manager’s amendment.

The bill faces a tighter timetable than most major legislation. Senate leadership has scheduled committee markup for Friday, with a floor vote anticipated as early as April 7. House sponsors are expected to introduce companion language in the Ways and Means Committee next week, where industry lobbyists are concentrating the bulk of their fire.

Cantwell adjourned the hearing shortly before 1 p.m., announcing that a second session focused on national security implications would convene Thursday morning. Committee staff said additional witnesses, including representatives from the Defense Department’s AI office, would be announced before the close of business Wednesday.