Public Hearings for Data Center Projects: Notice, Testimony and How to Prepare

The first question is what kind of decision the hearing supports, because it sets the rules for evidence, contact with board members and appeals. A rezoning or a text amendment is usually legislative: the board is making policy, it has broad discretion, and members may hear from constituents. A special use permit, conditional use permit or variance is often quasi-judicial: the board applies written standards to facts, much like a court. The labels and the line between them vary by state, so confirm with local counsel. Zoning for data centers explains the approval paths themselves.

The difference is practical. In North Carolina, every quasi-judicial decision must be based on competent, material and substantial evidence in the record, gathered at a formal evidentiary hearing where witnesses testify under oath and can be cross-examined.²⁶ Virginia counties handle data center special exceptions differently. After Loudoun County ended by-right data center approvals in March 2025, applications need a special exception, which involves legislative review and public hearings before both the planning commission and the board of supervisors.⁹

State law and the local ordinance set how the public must be told about a hearing: published advertisements, mailed notice to neighbors and, in many places, signs on the property. These rules are jurisdictional. If they are not followed, the approval can be thrown out no matter how well the hearing went.

Virginia’s rules show what is typically required. The advertisement may describe a proposal by reference, but it must say where the full text can be reviewed. For a zoning map change, the planning commission must send written notice at least five days before the hearing to the owners of each affected parcel, abutting parcels and parcels directly across the street, including parcels in a neighboring locality. A single mailing to the address in the tax records is adequate, a commission representative signs an affidavit that it was sent, and notice is re-mailed if the hearing is continued. Notice costs are charged to the applicant.⁵ When the land lies within half a mile of another locality, that locality’s chief administrative officer gets at least 10 days’ written notice.⁵

The Digital Gateway case is the cautionary example. The board was required to advertise the rezonings twice in a newspaper, with the first notice no more than 14 days before the vote. The first advertisement never ran because the county did not confirm the placement with the paper, and in August 2025 a circuit judge found that the notice complied with neither state nor county code and voided the rezonings.¹ The Virginia Court of Appeals upheld that ruling in 2026.⁴ The approval had followed a hearing that ran more than 24 hours.⁸

Most commissions follow a fixed order: staff presents the application and its recommendation, the applicant presents, the public speaks, the applicant rebuts, the chair closes the hearing, and the body deliberates. Many open by asking members to disclose conflicts or outside contacts about the case. Loudoun County’s planning commission publishes its limits: 10 minutes for staff, 10 for the applicant (the chair may extend this if asked before the meeting), 3 minutes for each individual speaker, 6 for a representative of a civic association with an authorization letter, and 5 for the applicant’s rebuttal. Speakers generally may address the commission only once.⁷

Two procedural points catch applicants out. First, once the hearing is closed, the record usually is too. One Oregon city’s procedure says no new evidence or testimony may be submitted after the hearing closes, and that the commission may continue the hearing to a date certain to gather more evidence or give notice to more people.³ Second, rebuttal is for answering what was said, not for introducing a new study. Anything the decision needs should be in the application file or the main presentation.

Expect length. Prince William County’s Digital Gateway hearing ran more than 24 hours with hundreds signed up in person and online.⁸ Fairfax County delayed its vote on data center rules in 2024 after a hearing of nearly five hours with 65 speakers.¹⁰ In Nashville in 2026, hundreds testified at a Metro Council hearing on proposed data center rules.¹¹

Boards decide against criteria, even in legislative cases. Virginia law directs localities to give reasonable consideration to factors such as the existing use and character of property, the comprehensive plan, trends of growth, the conservation of natural resources, flood plains and agricultural land, the conservation of properties and their values, and the most appropriate use of land.¹² Special use permit ordinances commonly ask whether the use will harm property values, conform to the plan and be in harmony with the area.²

For data centers, those criteria translate into a familiar list of questions:

• Plan consistency: Does the comprehensive plan designate the area for employment or industrial use? See comprehensive plans and future land use.
• Neighbor impacts: Generator and cooling noise, building mass, lighting and buffers. See noise, setbacks and buffers. Loudoun treated proximity to homes as decisive, excluding applications within 500 feet of residential areas from its grandfathering provision.⁹
• Infrastructure: Transmission lines and substations, water use, and construction traffic, often backed by a traffic impact study.
• Fiscal benefit: Tax revenue is usually the main argument in favor. At the Digital Gateway hearing, supporters pointed to revenue for schools while opponents raised environmental, noise and historic preservation concerns.⁸
• Conditions: Whether enforceable conditions, proffers or a development agreement can manage the impacts.

Evidence quality matters most in quasi-judicial hearings. North Carolina law provides that lay opinion is not competent evidence of impacts on property values or of traffic’s effect on public safety.⁶ A board there can rely only on opinions from qualified experts, with a proper foundation laid.⁶ The same logic is persuasive elsewhere: a sealed noise study answers a noise concern better than an assurance from the podium.

Most of a hearing’s outcome is set before the meeting. Staff recommendations carry weight, and staff write them from the application file. Work through staff comments, settle conditions where possible and make sure every study is in the file before the staff report is published.

• Lead with the site, not the industry. Commissioners want to know what this building will look and sound like from the nearest home, how power and water will be supplied, and how construction traffic will move.
• Bring the experts. Acoustical, traffic, civil and appraisal witnesses should be present to answer questions, and in quasi-judicial hearings to testify under oath.²
• Use visuals: viewshed renderings from neighboring lots, noise contour maps and a site plan with buffers marked.
• Plan the rebuttal. With about five minutes, group answers by theme and point to where each item is addressed in the record.⁷
• Respect the time limits. Asking the chair for more applicant time in advance is often allowed; running over is not.⁷

Engagement before the hearing changes what happens at it. The approaches that work, from neighbor meetings to written commitments, are covered in community engagement for data centers, and lessons from projects that drew organized opposition are in contested data center projects.

A hearing does not always end in a vote. Boards often defer action when testimony raises new questions, as Fairfax County did in 2024.¹⁰ A continuance can help, by giving time to answer concerns in writing, but it adds weeks and may require re-notice.⁵³ In two-stage systems, the planning commission’s recommendation goes to the governing body, which holds its own hearing.⁹ A favorable commission vote is a strong signal, not the final word.

After approval, the record becomes the project’s defense. Opponents can challenge an approval in court, and a challenge to notice or procedure can succeed even when the merits are not reached, as Digital Gateway showed.¹⁴ Keep a clean file: notice affidavits, the staff report, every exhibit submitted and the minutes. Then the project moves on to site plan review and permits, described in the data center permitting process.

Before you file: a short checklist

1. 01Identify the decision type (legislative or quasi-judicial) and the written criteria.
2. 02Confirm notice requirements under state law and the local ordinance, and who prepares and pays for them.⁵
3. 03Check for local moratoriums or pending ordinance changes. See data center moratoriums and local restrictions.
4. 04Commission the studies the criteria call for, and confirm the experts can attend.
5. 05Get the speaker rules and time limits for each body that will hear the case.⁷

A hearing goes better when the site itself is sound: power, water and buffers that hold up to scrutiny. If you want an outside view of a parcel before committing to the process, get a site reviewed.