# Seneca County, Ohio: Power, Data Centers and the Local Economy Home to Tiffin, Fostoria and Clinton Township Seneca County is not a build-out site today. It feels the boom through the grid it shares, the utilities that serve it and the work nearby. Seneca County is home to Tiffin, most of Fostoria (8,976 of its 12,920 residents), Clinton Township and Hopewell Township. Next door, Huron County has 1 data center and 297 MW of planned generation. Employers here counted 18,700 jobs in 2025, down 4.5% from 2019. Electrical contractors employ 158, up 3.3% since 2019 against up 37.0% statewide, at an average $81,598 a year. Unemployment was 3.4% in August 2026, against 4.1% in 2019. -4.5% total jobs since 2019, now 18,700 +3.3% electrical contractor jobs since 2019, now 158 4 MW of operating power plants, mostly natural gas ## Cities and towns in Seneca County Seneca County is home to Tiffin, most of Fostoria (8,976 of its 12,920 residents), Clinton Township and Hopewell Township. Tiffin17,803 residents Fostoria8,976 residents · 69% of the city Clinton Township4,003 residents Hopewell Township2,733 residents Loudon Township2,188 residents Liberty Township1,994 residents Eden Township1,987 residents Scipio Township1,693 residents Big Spring Township1,663 residents Venice Township1,634 residents Bloom Township1,608 residents Pleasant Township1,484 residents Seneca Township1,427 residents Jackson Township1,406 residents Thompson Township1,371 residents Adams Township1,209 residents Attica863 residents Bloomville845 residents Reed Township706 residents Green Springs637 residents · 48% of the city Bettsville584 residents Republic538 residents New Riegel279 residents - Fostoria also extends into [Hancock County](https://savrn.com/power-supply-chain-map/ohio/hancock-county), [Wood County](https://savrn.com/power-supply-chain-map/ohio/wood-county). - Green Springs also extends into [Sandusky County](https://savrn.com/power-supply-chain-map/ohio/sandusky-county). Unincorporated communities (governed by the county): Bascom, Flat Rock, Fort Seneca, Kansas, McCutchenville, Melmore, Old Fort. 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 Seneca County | Measure | Then | Now | Change | Rank in Ohio | |---|---|---|---|---| | Population (2020 → 2025) | 55,061 | 54,522 | ▼ 1.0% | 47th of 88 by size | | Total jobs (2019 → 2025) | 19,581 | 18,700 | ▼ 4.5% | 73rd of 88 by growth | | Average annual pay (2019 → 2025) | $38,129 | $51,007 | ▲ 33.8% | — | | Electrical contractor jobs (2019 → 2025) | 153 | 158 | ▲ 3.3% | — | | Electric utility jobs (2019 → 2025) | 98 | 91 | ▼ 7.1% | — | | Unemployment rate (2019 → August 2026) | 4.1% | 3.4% | ▼ 0.7pts | — | | Generating capacity added since 2019 | — | 0 MW | | — | | Generating capacity retired since 2019 | — | 0 MW | | — | Its power plants have 4 MW of capacity, 100% of it natural gas. Ohio Power Co is the largest utility serving Seneca County, one of 7 with territory here. Its residential customers paid an average 19.33¢/kWh in 2024, above the 15.40¢ median for Ohio utilities. 54,522 people live here, down 1.0% since 2020. ## Who powers Seneca County ### Utilities with service territory in Seneca County | Utility | Ownership | Service | Residential customers (systemwide) | Residential price, 2024 | Commercial share of sales | |---|---|---|---|---|---| | Ohio Power Co | Investor Owned | Bundled | 1,339,232 | 19.33¢ | 22% | | Ohio Edison Co | Investor Owned | Bundled | 957,780 | 16.18¢ | 18% | | The Toledo Edison Co | Investor Owned | Bundled | 278,814 | 16.64¢ | 16% | | Hancock-Wood Electric Coop Inc | Cooperative | Bundled | 11,307 | 17.05¢ | 29% | | North Central Elec Coop, Inc - (OH) | Cooperative | Bundled | 8,433 | 17.09¢ | 14% | | Firelands Electric Coop, Inc | — | — | — | — | — | | Village of Republic - (OH) | — | — | — | — | — | 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 | Technology | Capacity | Share | |---|---|---| | Natural gas | 4 MW | 100% | | Largest plants | Owner | Technology | MW | Since | |---|---|---|---|---| | POET Biorefining - Fostoria | Fostoria Ethanol | Natural gas | 4 MW | 2017 | ## The Seneca County labor market | Industry (2025) | Jobs | Average pay | Concentration vs U.S. | |---|---|---|---| | All industries | 18,700 | $51,007 | 1.00 | | Electrical contractors | 158 | $81,598 | 1.17 | | Electric utilities | 91 | $123,499 | 1.80 | 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 Seneca County No data center, local measure or delayed project is on record in Seneca County. Ohio has 105 local measures on record statewide, and 1 neighboring county has one: [Wood County](https://savrn.com/power-supply-chain-map/ohio/wood-county). ## Seneca County and its neighbors Of the 6 counties that border Seneca County, Wood 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 | |---|---|---|---|---|---|---| | Seneca County | 54,522 | ▼ 4.5% | 4 MW | — | — | — | | Crawford County](https://savrn.com/power-supply-chain-map/ohio/crawford-county) | 41,896 | ▼ 1.6% | 172 MW | — | — | — | | Hancock County](https://savrn.com/power-supply-chain-map/ohio/hancock-county) | 75,034 | ▼ 4.9% | 20 MW | 235 MW | — | — | | Huron County](https://savrn.com/power-supply-chain-map/ohio/huron-county) | 58,250 | ▲ 0.1% | 6 MW | 297 MW | 1 | — | | Sandusky County](https://savrn.com/power-supply-chain-map/ohio/sandusky-county) | 58,655 | ▼ 4.4% | 760 MW | — | — | — | | Wood County](https://savrn.com/power-supply-chain-map/ohio/wood-county) | 134,176 | ▲ 10.3% | 915 MW | 50 MW | 3 | 1 | | Wyandot County](https://savrn.com/power-supply-chain-map/ohio/wyandot-county) | 21,567 | ▲ 2.7% | 13 MW | — | — | — | ## More of Ohio [All Ohio countiesThe state power page and county mapOpen →](https://savrn.com/power-supply-chain-map/ohio)[Wood County134,176 peopleOpen →](https://savrn.com/power-supply-chain-map/ohio/wood-county)[Hancock County75,034 peopleOpen →](https://savrn.com/power-supply-chain-map/ohio/hancock-county)[Sandusky County58,655 peopleOpen →](https://savrn.com/power-supply-chain-map/ohio/sandusky-county)[Huron County58,250 peopleOpen →](https://savrn.com/power-supply-chain-map/ohio/huron-county)[Crawford County41,896 peopleOpen →](https://savrn.com/power-supply-chain-map/ohio/crawford-county) ## Seneca County, answered from the record ### Who provides electricity in Seneca County, Ohio? 7 utilities have service territory in Seneca County in the EIA-861 2024 report: Ohio Power Co, Ohio Edison Co, The Toledo Edison Co, Hancock-Wood Electric Coop Inc. The largest, Ohio Power Co, charged residential customers 19.33¢/kWh on average in 2024. ### What county is Tiffin, OH in? Tiffin is in Seneca County, Ohio. About 17,803 people live there (2025 Census estimate). ### What power plants are in Seneca County? 1 operating plant with 4 MW of capacity. The largest is POET Biorefining - Fostoria (4 MW, natural gas). ### Are there data centers in Seneca County? The SAVRN Data Center Map has no data center in Seneca County. The nearest activity on record is next door in Huron County. ### Is Seneca County adding jobs? Employers counted 18,700 jobs in 2025 against 19,581 in 2019 (-4.5%, BLS QCEW). ### Does Seneca County have a data center moratorium? No county-level measure is on record for Seneca County. Ohio has 105 local measures statewide, listed on the state page. --- Canonical: https://savrn.com/power-supply-chain-map/ohio/seneca-county Updated: 2026-10-08. Refreshed weekly by SAVRN from EIA, BLS, BEA, Census and the SAVRN trackers. License: CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/).