Madison County, Illinois: Power, Data Centers and the Local Economy
Home to Edwardsville Township, Collinsville Township and Wood River Township
The build-out shows up in Madison County as work for the electrical trades. Madison County is home to Edwardsville Township, Collinsville Township, Wood River Township and Granite City. 8 MW of new generation is planned here across 2 units, led by SV CSG South Roxana, LLC (solar). 2 MW of it is already under construction or built. Construction employs 6,817, up 19.7% since 2019. Next door, St. Louis County, Missouri, has 7 data centers and 648 MW of planned generation. Electrical contractors employ 872, up 26.9% since 2019 against up 3.9% statewide, at an average $105,704 a year.
Cities and towns in Madison County
Madison County is home to Edwardsville Township, Collinsville Township, Wood River Township and Granite City.
And 16 smaller places.
- Collinsville also extends into St. Clair County.
Unincorporated communities (governed by the county): Holiday Shores, Mitchell, Moro, Prairietown, Rosewood Heights.
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 Madison County
1st = the most. Ranks cover counties with a value on record.
| Measure | Then | Now | Change | Rank in Illinois |
|---|---|---|---|---|
| Population (2020 → 2025) | 265,746 | 263,110 | ▼ 1.0% | 8th of 102 by size |
| Total jobs (2019 → 2025) | 101,531 | 107,517 | ▲ 5.9% | 17th of 102 by growth |
| Average annual pay (2019 → 2025) | $45,142 | $59,911 | ▲ 32.7% | — |
| Construction jobs (2019 → 2025) | 5,696 | 6,817 | ▲ 19.7% | 18th of 56 by growth |
| Electrical contractor jobs (2019 → 2025) | 687 | 872 | ▲ 26.9% | — |
| Electric utility jobs (2019 → 2025) | 375 | 574 | ▲ 53.1% | — |
| Unemployment rate (2019 → August 2026) | 3.8% | 3.5% | ▼ 0.3pts | — |
| Generating capacity added since 2019 | — | 20 MW | — | |
| Generating capacity retired since 2019 | — | 4 MW | — | |
| Planned generation (Aug 2026) | — | 8 MW | 1% of today's fleet | 41st of 57 by size |
4 MW has retired here since 2019, including Highland (petroleum, 4 MW, 2023). Its power plants have 701 MW of capacity, 84% of it natural gas. 20 MW of that came online in 2019 or later, mostly solar. Employers here counted 107,517 jobs in 2025, up 5.9% from 2019. Ameren Illinois Company is the largest utility serving Madison County, one of 5 with territory here. Its residential customers paid an average 15.26¢/kWh in 2024. Unemployment was 3.5% in August 2026, against 3.8% in 2019. 263,110 people live here, down 1.0% since 2020, 8th of 102 Illinois counties by population.
Who powers Madison County
Net change in operating capacity since 2019: +16 MW. Colors follow the fuel legend above.
Utilities with service territory in Madison County
| Utility | Ownership | Service | Residential customers (systemwide) | Residential price, 2024 | Commercial share of sales |
|---|---|---|---|---|---|
| Ameren Illinois Company | Investor Owned | Bundled | 1,060,894 | 15.26¢ | 28% |
| Southwestern Electric Coop Inc - (IL) | Cooperative | Bundled | 24,822 | 13.68¢ | 17% |
| Clinton County Elec Coop, Inc | — | — | — | — | — |
| City of Highland | — | — | — | — | — |
| M J M Electric Cooperative Inc | — | — | — | — | — |
Customer counts, prices and sales shares cover each utility's whole system in the state, not only this county. Commercial sales include data centers.
Operating power plants 11
| Technology | Capacity | Share |
|---|---|---|
| Natural gas | 586 MW | 84% |
| Other technologies | 78 MW | 11% |
| Solar | 20 MW | 3% |
| Petroleum | 17 MW | 2% |
| Largest plants | Owner | Technology | MW | Since |
|---|---|---|---|---|
| Venice | Union Electric Co - (MO) | Natural gas | 586 MW | 2002 |
| Granite City Works | United States Steel Granite City Works | Other technologies | 78 MW | 2010 |
| Highland | City of Highland - (IL) | Petroleum | 14 MW | 1971 |
| IL - Ameresco - Alton | Alton Landfill Solar LLC | Solar | 5 MW | 2025 |
| Midwest Power Partners LLC (Pirolo) | SRC Partnership 15 LLC | Solar | 5 MW | 2025 |
| IMEA Highland | City of Highland - (IL) | Petroleum | 4 MW | 1996 |
Planned generation 2
| Plant | Technology | MW | Status | Year | Owner |
|---|---|---|---|---|---|
| SV CSG South Roxana | Solar Photovoltaic | 5 MW | Approvals pending | 2027 | SV CSG South Roxana, LLC |
| SV CSG Roxana 1 | Solar Photovoltaic | 2 MW | Under construction (>50%) | 2026 | SV CSG Roxana 1 LLC |
Retired since 2019
| Plant | Technology | MW | Year |
|---|---|---|---|
| Highland | Petroleum | 4 MW | 2023 |
The Madison County labor market
| Industry (2025) | Jobs | Average pay | Concentration vs U.S. |
|---|---|---|---|
| All industries | 107,517 | $59,911 | 1.00 |
| Construction | 6,817 | $88,492 | 1.20 |
| Electrical contractors | 872 | $105,704 | 1.12 |
| Electric utilities | 574 | $153,615 | 1.97 |
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 Madison County
No data center, local measure or delayed project is on record in Madison County. Illinois has 28 local measures on record statewide, and 1 neighboring county has one: St. Charles County.
Madison County and its neighbors
Of the 9 counties that border Madison County, St. Louis 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 |
|---|---|---|---|---|---|---|
| Madison County | 263,110 | ▲ 5.9% | 701 MW | 8 MW | — | — |
| Bond County | 16,959 | ▲ 0.1% | — | 5 MW | — | — |
| Clinton County | 37,128 | ▲ 2.6% | 47 MW | 53 MW | — | — |
| Jersey County | 21,160 | ▲ 3.6% | 110 MW | — | — | — |
| Macoupin County | 43,748 | ▼ 3.6% | 226 MW | 5 MW | — | — |
| Montgomery County | 28,076 | ▲ 0.8% | 56 MW | 10 MW | — | — |
| St. Charles County MO | 426,499 | ▲ 7.1% | 1,104 MW | — | 1 | 1 |
| St. Clair County | 250,708 | ▼ 3.2% | 1,821 MW | 155 MW | — | — |
| St. Louis (city) MO | 278,144 | ▼ 4.0% | — | — | 14 | — |
| St. Louis County MO | 990,911 | ▼ 3.4% | 34 MW | 648 MW | 7 | — |
More of Illinois
Madison County, answered from the record
Who provides electricity in Madison County, Illinois?
5 utilities have service territory in Madison County in the EIA-861 2024 report: Ameren Illinois Company, Southwestern Electric Coop Inc - (IL), Clinton County Elec Coop, Inc, City of Highland. The largest, Ameren Illinois Company, charged residential customers 15.26¢/kWh on average in 2024.
What county is Edwardsville Township, IL in?
Edwardsville Township is in Madison County, Illinois. About 40,258 people live there (2025 Census estimate).
What county is Collinsville Township, IL in?
Collinsville Township is in Madison County, Illinois. About 35,276 people live there (2025 Census estimate).
What county is Wood River Township, IL in?
Wood River Township is in Madison County, Illinois. About 29,456 people live there (2025 Census estimate).
What power plants are in Madison County?
11 operating plants with 701 MW of capacity. The largest is Venice (586 MW, natural gas).
How much new power is planned in Madison County?
8 MW across 2 units in the August 2026 EIA-860M inventory, 2 MW of it under construction or built. The largest owner is SV CSG South Roxana, LLC.
Are there data centers in Madison County?
The SAVRN Data Center Map has no data center in Madison County. The nearest activity on record is next door in St. Louis County.
Is Madison County adding jobs?
Employers counted 107,517 jobs in 2025 against 101,531 in 2019 (+5.9%, BLS QCEW). Construction went from 5,696 to 6,817.
Does Madison County have a data center moratorium?
No county-level measure is on record for Madison County. Illinois has 28 local measures statewide, listed on the state page.