What Data Centers Are
Most are quiet digital infrastructure, not industrial campuses.
Public confusion usually starts when one phrase is used for radically different facilities. The same label can describe a school IT room, a hospital server space, a regional colo, or a hyperscale AI campus. Once that difference is clear, the rest of the debate becomes easier to follow.
What They Are
Rooms or buildings full of servers
A data center is simply a room or building that houses computer servers, the machines that store and process digital information.
What They Power
Systems people already rely on every day
Banks, hospital records, school software, local business websites, 911 systems, and regional digital services all depend on this kind of infrastructure.
Why They Matter
Properly scaled facilities can support normal local growth
Smaller facilities can support skilled jobs, stronger connectivity, tax value, and business retention without creating hyperscale-level strain or unusual utility burdens.
The Five Tiers
These tiers are not legal definitions. They are a practical public guide to help readers understand why some facilities feel routine and others create much larger local questions.
| Tier | Size | Power | Hardware | Examples | Purpose | Impact |
|---|---|---|---|---|---|---|
| Tier 1 Server Room / IT Closet | Under 2,000 sq ft | Under 100 kW (5-10 homes) | ~1-50 servers, plus a handful of storage arrays and switches | Dentist office, law firm, small factory, school | Internal business software, file storage, phones, cameras | No unique impact. Indistinguishable from a normal office. No extra utility burden, no added traffic. |
| Tier 2 Edge / Small Colocation | 2,000 - 10,000 sq ft | 100 kW - 1 MW (grocery store) | ~100-2,000 servers, plus storage and networking equipment | Local MSPs, regional web hosts, ISP edge nodes | Hosting local business websites, regional backups, faster streaming | Minimal impact. Footprint of a small warehouse. Brings skilled local jobs. Standard utility demand. |
| Tier 3 Regional / Enterprise | 10,000 - 100,000 sq ft | 1 - 10 MW (small town) | ~1,000-30,000 servers, plus extensive storage and networking | Hospitals, universities, regional banks, mid-size colos | Electronic medical records, banking systems, university platforms | Moderate, manageable. Fits within existing utility planning. Brings skilled jobs and tax revenue. Most communities want these. |
| Tier 4 Large Enterprise / Wholesale Colo | 100,000 - 500,000 sq ft | 10 - 100 MW (small-to-medium city) | ~10,000-300,000 servers, plus massive storage and networking arrays | Enterprise DCs (banks, retail), wholesale colo (Digital Realty) | Enterprise IT for large corporations, wholesale cloud hosting | Significant. Requires substation upgrades and utility coordination. Substantial tax revenue, construction and operating jobs. Warrants major-development review. |
| Tier 5 Hyperscale / AI Campus | 500,000 sq ft to several million | 100 MW - 1,000+ MW (major city) | 100,000 to 1,000,000+ servers (IDC threshold: 5,000+ minimum) | Meta, Google, Amazon, Microsoft, xAI campuses | Training large AI models, global cloud workloads | Severe. Can draw more electricity than the host county uses today. Millions of gallons of cooling water daily. Diesel backup, grid strain, continuous truck traffic. The target of this zoning. |
Downloadable Handout
Take the tier table with you
This PDF handout is a clean one-page version of the five data center tiers for residents, planners, and local officials.
PDF Handout
The Five Scales of Data Centers
Use this if you want the tier table as a simple shareable document instead of sending someone back to the webpage.
Why Scale Matters
The important line is not “data center or no data center.” It is scale.
Communities often benefit from ordinary data infrastructure. The real conflict begins when a project moves into Tier 5 and starts to look less like normal infrastructure and more like a major utility-and-land-use event.
Tiers 1-4
Ordinary community-serving infrastructure
These tiers cover everything from school IT rooms and hospital server space to regional enterprise facilities and large wholesale colocation. They can require serious review, especially at Tier 4, but they are still a different category from a hyperscale campus.
Tier 5
A different class of local question
Once a project moves into large-campus or hyperscale territory, the questions shift to power delivery, water and wastewater, traffic, compatibility, cost allocation, and what protections remain after approval.
Where Charleston Fit
The Charleston proposal belonged in the hyperscale tier.
Tier 5
The Charleston proposal fit the hyperscale / AI campus tier rather than the smaller local tiers.
251 acres
Large enough to be a campus-scale proposal, not a routine stand-alone building.
Up to 450 MW
The kind of load that turns the issue into a serious land, utility, and siting question.
Different rules
Tier 5 data centers warrant stricter restrictions. Those rules should not be applied wholesale to smaller tiers.