Madison County, Ohio: Power, Data Centers and the Local Economy
Home to London, Jefferson Township and Union Township
Madison County is a power-producing county: the plants here serve load well beyond its borders. Employers here counted 24,269 jobs in 2025, up 34.9% from 2019 (the fastest growth of 88 Ohio counties). Madison County is home to London, Jefferson Township, Union Township and West Jefferson. 155 MW of new generation is planned here across 1 unit, led by Springwater Solar, LLC (solar). 155 MW of it is already under construction or built. 957 MW of that came online in 2019 or later, mostly solar. Next door, Franklin County has 56 data centers and 400 MW of planned generation.
Cities and towns in Madison County
Madison County is home to London, Jefferson Township, Union Township and West Jefferson.
- Plain City also extends into Union County.
Unincorporated communities (governed by the county): Choctaw Lake, Lafayette, Plumwood.
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 Ohio |
|---|---|---|---|---|
| Population (2020 → 2025) | 43,864 | 46,985 | ▲ 7.1% | 51st of 88 by size |
| Total jobs (2019 → 2025) | 17,987 | 24,269 | ▲ 34.9% | 1st of 88 by growth |
| Average annual pay (2019 → 2025) | $43,586 | $56,556 | ▲ 29.8% | — |
| Unemployment rate (2019 → August 2026) | 3.5% | 3.0% | ▼ 0.5pts | — |
| Generating capacity added since 2019 | — | 957 MW | — | |
| Generating capacity retired since 2019 | — | 0 MW | — | |
| Planned generation (Aug 2026) | — | 155 MW | 16% of today's fleet | 11th of 22 by size |
Its power plants have 957 MW of capacity, 100% of it solar. Electrical contractors employ 76, at an average $63,328 a year. Unemployment was 3.0% in August 2026, against 3.5% in 2019. Ohio Edison Co is the largest utility serving Madison County, one of 5 with territory here. Its residential customers paid an average 16.18¢/kWh in 2024, above the 15.40¢ median for Ohio utilities. 46,985 people live here, up 7.1% since 2020.
Who powers Madison County
Net change in operating capacity since 2019: +957 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 |
|---|---|---|---|---|---|
| Ohio Edison Co | Investor Owned | Bundled | 957,780 | 16.18¢ | 18% |
| Duke Energy Ohio Inc | Investor Owned | Bundled | 693,435 | 15.00¢ | 26% |
| Dayton Power & Light Co | Investor Owned | Bundled | 478,741 | 15.32¢ | 20% |
| South Central Power Company | Cooperative | Bundled | 117,469 | 14.87¢ | 14% |
| Pioneer Rural Elec Coop, Inc - (OH) | Cooperative | Bundled | 16,310 | 16.18¢ | 6% |
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 4
| Technology | Capacity | Share |
|---|---|---|
| Solar | 957 MW | 100% |
| Largest plants | Owner | Technology | MW | Since |
|---|---|---|---|---|
| Fox Squirrel Solar | EDF Renewable Asset Holdings, Inc. | Solar | 577 MW | 2023 |
| Big Plain Solar, LLC | Leeward Asset Management, LLC | Solar | 196 MW | 2023 |
| Madison Fields Solar Project, LLC | Madison Fields Solar Project, LLC | Solar | 180 MW | 2024 |
| IGS CMH4, LLC | Altus Power America Management, LLC | Solar | 4 MW | 2023 |
Planned generation 1
| Plant | Technology | MW | Status | Year | Owner |
|---|---|---|---|---|---|
| Springwater Solar, LLC | Solar Photovoltaic | 155 MW | Under construction (≤50%) | 2027 | Springwater Solar, LLC |
The Madison County labor market
| Industry (2025) | Jobs | Average pay | Concentration vs U.S. |
|---|---|---|---|
| All industries | 24,269 | $56,556 | 1.00 |
| Electrical contractors | 76 | $63,328 | 0.43 |
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. Ohio has 105 local measures on record statewide, and 5 neighboring counties have one: Champaign County, Clark County, Fayette County, Franklin County.
Madison County and its neighbors
Of the 7 counties that border Madison County, Franklin 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 | 46,985 | ▲ 34.9% | 957 MW | 155 MW | — | — |
| Champaign County | 38,820 | ▲ 4.5% | 144 MW | — | — | 1 |
| Clark County | 135,340 | ▼ 4.7% | 2 MW | — | 1 | 1 |
| Fayette County | 28,552 | ▲ 7.3% | — | — | — | 1 |
| Franklin County | 1,361,536 | ▲ 3.4% | 15 MW | 400 MW | 56 | 1 |
| Greene County | 174,322 | ▲ 5.2% | 2 MW | 175 MW | — | — |
| Pickaway County | 62,978 | ▲ 18.5% | 764 MW | — | — | 1 |
| Union County | 73,446 | ▲ 9.8% | 565 MW | 50 MW | 7 | — |
More of Ohio
Madison County, answered from the record
Who provides electricity in Madison County, Ohio?
5 utilities have service territory in Madison County in the EIA-861 2024 report: Ohio Edison Co, Duke Energy Ohio Inc, Dayton Power & Light Co, South Central Power Company. The largest, Ohio Edison Co, charged residential customers 16.18¢/kWh on average in 2024.
What county is London, OH in?
London is in Madison County, Ohio. About 10,813 people live there (2025 Census estimate).
What power plants are in Madison County?
4 operating plants with 957 MW of capacity. The largest is Fox Squirrel Solar (577 MW, solar).
How much new power is planned in Madison County?
155 MW across 1 units in the August 2026 EIA-860M inventory, 155 MW of it under construction or built. The largest owner is Springwater Solar, 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 Franklin County.
Is Madison County adding jobs?
Employers counted 24,269 jobs in 2025 against 17,987 in 2019 (+34.9%, BLS QCEW).
Does Madison County have a data center moratorium?
No county-level measure is on record for Madison County. Ohio has 105 local measures statewide, listed on the state page.