Commission backs SUP for modular data center at RD Wells substation with noise and access conditions

The commission unanimously recommended approval of a specific use permit (SUP) for a modular data center on a roughly 4.06‑acre city‑owned parcel adjacent to the RD Wells substation.

Staff summary: Angie Mangleris described the site as predominantly industrial and said the proposed use is consistent with an existing lease and power purchase agreement with Denton Municipal Electric (DME). Staff recommended approval with conditions including a binding site plan, a noise and vibration assessment, and access specifications.

Applicant description: Spencer Smith, Cumulus AI director of engineering, explained the facility’s technology is a liquid‑cooled modular design in which servers are immersed in a dielectric fluid; heat is rejected via fans and dry coolers. He told commissioners the system requires no continuous municipal water, noting: “There is no water usage.” The applicant also said prior deployments use similar cooling strategies and the equipment outside will be limited to heat‑rejection fans.

Commission concerns and conditions: Commissioners focused on noise, vibration, and energy supply. Staff said the required noise verification must show site operations do not increase ambient sound levels by more than 3 decibels at specified measurement points; DME retains final authority to confirm power supply to the substation under its procurement/lease decisions. The SUP was approved 6–0 and will proceed to City Council; staff noted a tentative council date for related actions.

Next steps: The SUP will be conditioned in the building permit and the applicant must submit verification that noise limits are met once equipment is installed.