Williamson County, Tennessee: Power, Data Centers and the Local Economy
Home to Franklin, Brentwood and Spring Hill
Williamson County is one of the places the data center build-out is physically happening. The SAVRN Data Center Map lists 7 data centers in Williamson County, 9% of Tennessee's total. Williamson County is home to Franklin, Brentwood, most of Spring Hill (39,711 of its 61,336 residents) and Nolensville. Construction employs 9,354, up 29.3% since 2019. Employers here counted 151,470 jobs in 2025, up 8.1% from 2019. 272,061 people live here, up 9.0% since 2020, 6th of 95 Tennessee counties by population.
Cities and towns in Williamson County
Williamson County is home to Franklin, Brentwood, most of Spring Hill (39,711 of its 61,336 residents) and Nolensville.
- Spring Hill also extends into Maury County.
Residents are 2025 Census estimates for the part of each city, town or township inside this county. Census publishes no annual estimate for unincorporated communities.
What changed in Williamson County
1st = the most. Ranks cover counties with a value on record.
| Measure | Then | Now | Change | Rank in Tennessee |
|---|---|---|---|---|
| Population (2020 → 2025) | 249,614 | 272,061 | ▲ 9.0% | 6th of 95 by size |
| Total jobs (2019 → 2025) | 140,073 | 151,470 | ▲ 8.1% | 36th of 95 by growth |
| Average annual pay (2019 → 2025) | $68,651 | $90,424 | ▲ 31.7% | — |
| Construction jobs (2019 → 2025) | 7,232 | 9,354 | ▲ 29.3% | 26th of 55 by growth |
| Electrical contractor jobs (2019 → 2025) | 476 | 458 | ▼ 3.8% | — |
| Data processing and hosting jobs (2019 → 2025) | 1,231 | 1,075 | ▼ 12.7% | — |
| Unemployment rate (2019 → August 2026) | 2.5% | 3.0% | ▲ 0.5pts | — |
Unemployment was 3.0% in August 2026, against 2.5% in 2019. Electrical contractors employ 458, down 3.8% since 2019 against up 20.9% statewide, at an average $87,863 a year. Nashville Electric Service is the largest utility serving Williamson County, one of 4 with territory here. Its residential customers paid an average 13.47¢/kWh in 2024, above the 12.22¢ median for Tennessee utilities.
Who powers Williamson County
Utilities with service territory in Williamson County
| Utility | Ownership | Service | Residential customers (systemwide) | Residential price, 2024 | Commercial share of sales |
|---|---|---|---|---|---|
| Nashville Electric Service | Municipal | Bundled | 417,640 | 13.47¢ | 50% |
| Middle Tennessee E M C | Cooperative | Bundled | 307,370 | 11.76¢ | 37% |
| Duck River Elec Member Corp | Cooperative | Bundled | 71,342 | 12.50¢ | 27% |
| Columbia Power System - (TN) | Municipal | Bundled | 31,166 | 12.00¢ | 35% |
Customer counts, prices and sales shares cover each utility's whole system in the state, not only this county. Commercial sales include data centers.
No operating power plant is located in Williamson County in the EIA-860M inventory. Its power comes over the grid from plants elsewhere.
The Williamson County labor market
| Industry (2025) | Jobs | Average pay | Concentration vs U.S. |
|---|---|---|---|
| All industries | 151,470 | $90,424 | 1.00 |
| Construction | 9,354 | $97,834 | 1.17 |
| Electrical contractors | 458 | $87,863 | 0.42 |
| Electric utilities | 129 | $186,191 | 0.31 |
| Data processing and hosting | 1,075 | $167,556 | 2.28 |
Concentration is the BLS location quotient: 1.0 means the industry holds the same share of local jobs as it does nationally. Industry rows count private employers; cells BLS suppresses are left out.
Data centers and local rules in Williamson County
7 data centers in Williamson County are on the SAVRN Data Center Map.
Williamson County and its neighbors
Of the 7 counties that border Williamson County, Davidson County carries the most build-out activity: data centers, planned generation and operating plants combined.
| County | Population | Jobs since 2019 | Operating MW | Planned MW | Data centers | Local measures |
|---|---|---|---|---|---|---|
| Williamson County | 272,061 | ▲ 8.1% | — | — | 7 | — |
| Cheatham County | 42,778 | ▲ 14.2% | — | — | — | — |
| Davidson County | 745,904 | ▲ 8.2% | 53 MW | — | 24 | 1 |
| Dickson County | 58,662 | ▲ 4.3% | 36 MW | — | — | 1 |
| Hickman County | 26,219 | ▲ 12.3% | 6 MW | — | — | — |
| Marshall County | 38,071 | ▲ 1.1% | — | — | — | — |
| Maury County | 118,131 | ▲ 8.2% | — | — | — | 1 |
| Rutherford County | 386,352 | ▲ 10.8% | 8 MW | — | 1 | 1 |
More of Tennessee
Williamson County, answered from the record
Who provides electricity in Williamson County, Tennessee?
4 utilities have service territory in Williamson County in the EIA-861 2024 report: Nashville Electric Service, Middle Tennessee E M C, Duck River Elec Member Corp, Columbia Power System - (TN). The largest, Nashville Electric Service, charged residential customers 13.47¢/kWh on average in 2024.
What county is Franklin, TN in?
Franklin is in Williamson County, Tennessee. About 90,226 people live there (2025 Census estimate).
What county is Brentwood, TN in?
Brentwood is in Williamson County, Tennessee. About 45,313 people live there (2025 Census estimate).
What county is Spring Hill, TN in?
Most of Spring Hill is in Williamson County: 39,711 of its 61,336 residents, or 65%. The rest of the city lies in Maury County.
Are there data centers in Williamson County?
Yes. The SAVRN Data Center Map lists 7 data centers in Williamson County.
Is Williamson County adding jobs?
Employers counted 151,470 jobs in 2025 against 140,073 in 2019 (+8.1%, BLS QCEW). Construction went from 7,232 to 9,354.
Does Williamson County have a data center moratorium?
No county-level measure is on record for Williamson County. Tennessee has 38 local measures statewide, listed on the state page.