St. Louis committee advances detailed data‑center rules after technical briefing and hours of public comment

A St. Louis Board of Aldermen committee heard hours of testimony and adopted multiple technical amendments on Wednesday as it continued work on Board Bill 49, a proposed ordinance to regulate data‑center development in the city.

Alicia Russell, the city’s sustainability director, told the Housing, Urban Development & Zoning Committee that data centers use far more electricity per square foot than typical commercial buildings and that large facilities can have outsized impacts on local greenhouse‑gas emissions. “A 30‑megawatt data center is the equivalent of 22,000 to 25,000 homes’ annual use,” Russell said, adding that the local grid’s current renewable share is about 12% and depends heavily on coal in the near term.

Russell said megawatt thresholds were chosen as a practical way to measure external impacts — including generator testing, noise and indirect emissions from power generation — and asked the committee to consider mitigation strategies such as directing investments toward household energy upgrades.

Alderwoman Anne Schwitzer, who sponsored the bill, said the draft divides data centers into micro, standard and major categories so regulations match scale and risk. Planners and utility staff briefed the committee about how renewable‑energy credits and transmission constraints affect what a new major user of power can realistically provide at start‑up and over time.

A steady stream of public commentators urged both stronger protections and caution. Anne Kitlouse, executive director of the Locust Central Business District, described an existing standard‑category facility that began work without clear neighborhood outreach, installed rooftop fans and a 30,000‑gallon diesel tank near commercial patios, and then engaged neighbors. Kitlouse urged mandatory neighbor coordination, screening, limits on generator testing and explicit protections for on‑site fuel storage and refueling.

Health professionals and community advocates asked the committee to require health‑impact assessments for major projects, enforceable nighttime noise limits, continuous public noise and emissions monitoring, and strict restrictions on diesel generator testing outside of emergency use. “Monitoring is valuable, but monitoring does not prevent exposure,” said nurse practitioner Kristen Simpson, who urged preapproval health assessments for major facilities.

Industry groups and developers pushed back that several provisions — including large setbacks, district concentration limits and aggressive renewable requirements — could make many downtown sites infeasible. Tim Brinker of Greater St. Louis Incorporated outlined six specific business concerns, including the 30‑megawatt threshold, a 600‑foot setback for major facilities, and retrofit requirements for existing operations.

After extended discussion the committee approved a set of technical amendments — clarifying definitions for bundled versus unbundled renewable energy certificates, inserting a staged compliance timeline (the committee worked toward a compromise of an initial, lower occupancy requirement with 50% by year five and higher targets by year 10), requiring credentialed professional review of environmental studies and adding requirements for on‑site fuel plans and spill containment. Committee members also adopted clarifications about measuring maximum power demand at a single point of interconnection and expanded acceptable application documentation.

Alderwoman Schwitzer said staff and stakeholders had asked for time to reconcile language on how and when existing, nonconforming data centers would be brought under the new ordinance. For that reason the committee agreed to continue final consideration at a follow‑up HUDZ meeting the next day at 3:30 p.m.

The committee’s next steps will include finalizing whether and how current data centers must meet the new standards, resolving remaining questions about renewable‑energy availability and enforcement, and publishing clearer compliance schedules and penalty mechanisms. The hearing record includes extensive community written comments and dozens of in‑person witnesses, evidence the issue has quickly become a central land‑use concern for St. Louis officials.

The committee adjourned after scheduling the continuation; no final vote on Board Bill 49 was taken at today’s session.