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Committee hears detailed, contentious testimony on draft data-center zoning rules; public consent, setbacks and renewable rules debated
Summary
Alderman Schweitzer and planning staff presented Board Bill 49, a detailed zoning framework classifying data centers by size and power demand and proposing conditional use rules, setbacks, renewable-energy thresholds and reporting. Public commenters and industry speakers sharply differed on community consent, treatment of existing data centers and enforceable renewable and generator rules.
Alderman Schweitzer presented Board Bill 49 to the HUDZ committee, describing a planning-commission-drafted zoning chapter that would define micro, standard and major data centers and require conditional use review for all sizes. Planning staff said the draft ties regulatory categories to both square footage and maximum power demand (micro <5 megawatts; standard 5–30 megawatts and up to 250,000 square feet; major beginning at 30 megawatts, capped at 500,000 square feet in the draft) and would conditionally allow facilities only after an interdepartmental review.
Miriam Keller, City Planning executive, summarized key elements: tiered location rules, conditioned approvals in all districts (no by-right allowance), required disclosures of projected energy and water use, tiered setbacks (150/300/600 feet for micro/standard/major near homes and transit), bans on evaporative cooling systems that use large volumes of water, standards for noise and low-frequency vibration, limits and testing rules for backup generators, renewable-energy thresholds at market entry, community engagement requirements before an application is eligible, and a public-impact agreement that would require Board of Aldermen approval for the largest facilities.
Public comment stretched for hours and reflected a stark divide. Environmental and resident groups urged stronger protections including a community-consent mechanism (modeled on liquor-license neighborhood consent), stricter setbacks from hospitals and schools, immediate requirements for new renewable generation rather than reliance on renewable energy credits (RECs), limits on diesel-generator testing tied to air quality index levels, and mandatory monitoring and decommissioning plans. Elise Schafer of the Missouri Coalition for the Environment supported the draft but urged a consent provision and tighter renewable deadlines.
Industry representatives, downtown property owners and economic-development advocates argued the draft could make existing downtown data centers nonconforming, warned that square-footage caps and generator triggers could create legal exposure, and urged carve-outs or clearer rules for existing facilities and for reuse of underused industrial buildings. Netrality Data Centers and downtown stakeholders said backup generators run very infrequently and noted that many downtown facilities support critical local networks. Speakers requested clearer, practicable renewable standards and engagement with Ameren (the utility) for feasible thresholds.
Committee members and planning staff debated whether to classify by physical size or by maximum power demand (the latter is a more direct proxy for environmental and infrastructure impacts but is less commonly used in zoning). Staff said some jurisdictions use megawatt thresholds but capping maximum power demand is legally and technically novel and raises research and precedent issues; they landed on a combined approach for the draft. Planning staff said the regulations remain under review, particularly the sections on existing nonconforming uses, generator-capacity triggers and square-foot thresholds, and planners flagged that changes would require returning to the planning commission for review.
No committee vote was taken on Board Bill 49 at this meeting; the sponsor said the item will be discussed again next week and that planning staff will continue to refine thresholds, monitoring and community-engagement language.
Representative quotes: "These are very real environmental concerns and they vary substantially based on facility size," Miriam Keller said. "We recommend a tiered, conditional approach so the city can evaluate each site and mitigate impacts."
"We strongly support common-sense safeguards — reporting, renewable targets and monitoring — and we recommend adding community consent for the largest facilities," Elise Schafer said.
What’s next: Planning and the sponsor will refine the ordinance language (particularly treatment of existing data centers, generator triggers and the community-consent mechanism) and bring amendments back to committee before a final vote.
