Sullivan County, New York: Power, Data Centers and the Local Economy
Home to Thompson, Fallsburg and Mamakating
Sullivan 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. Sullivan County is home to Thompson, Fallsburg, Mamakating and Monticello. 5 MW of new generation is planned here across 1 unit, led by NY Fallsburg II, LLC (solar). 5 MW of it is already under construction or built. Construction employs 1,348, up 24.2% since 2019. Next door, Pike County, Pennsylvania, has 1 data center. 41 MW of that came online in 2019 or later, mostly solar.
Cities and towns in Sullivan County
Sullivan County is home to Thompson, Fallsburg, Mamakating and Monticello.
Unincorporated communities (governed by the county): Barryville, Bridgeville, Callicoon, Eldred, Fallsburg, Grahamsville, Hankins, Hortonville, Hurleyville, Kauneonga Lake, Kiamesha Lake, Lake Huntington, Livingston Manor, Loch Sheldrake, Mongaup Valley, Mountain Dale, Narrowsburg, Rock Hill, Roscoe, Smallwood, South Fallsburg, Swan Lake, White Lake, Woodbourne, Wurtsboro Hills.
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 Sullivan County
1st = the most. Ranks cover counties with a value on record.
| Measure | Then | Now | Change | Rank in New York |
|---|---|---|---|---|
| Population (2020 → 2025) | 78,461 | 80,586 | ▲ 2.7% | 32nd of 62 by size |
| Total jobs (2019 → 2025) | 29,392 | 30,789 | ▲ 4.8% | 8th of 62 by growth |
| Average annual pay (2019 → 2025) | $43,548 | $58,618 | ▲ 34.6% | — |
| Construction jobs (2019 → 2025) | 1,085 | 1,348 | ▲ 24.2% | 6th of 55 by growth |
| Unemployment rate (2019 → August 2026) | 4.0% | 3.8% | ▼ 0.2pts | — |
| Generating capacity added since 2019 | — | 41 MW | — | |
| Generating capacity retired since 2019 | — | 0 MW | — | |
| Planned generation (Aug 2026) | — | 5 MW | 4% of today's fleet | 39th of 43 by size |
Employers here counted 30,789 jobs in 2025, up 4.8% from 2019 (the 8th fastest growth of 62 New York counties). Its power plants have 123 MW of capacity, 62% of it hydro. New York State Elec & Gas Corp is the largest utility serving Sullivan County, one of 2 with territory here. Its residential customers paid an average 18.32¢/kWh in 2024, above the 17.22¢ median for New York utilities. Unemployment was 3.8% in August 2026, against 4.0% in 2019. 80,586 people live here, up 2.7% since 2020.
Who powers Sullivan County
Net change in operating capacity since 2019: +41 MW. Colors follow the fuel legend above.
Utilities with service territory in Sullivan County
| Utility | Ownership | Service | Residential customers (systemwide) | Residential price, 2024 | Commercial share of sales |
|---|---|---|---|---|---|
| New York State Elec & Gas Corp | Investor Owned | Bundled | 792,300 | 18.32¢ | 23% |
| Orange & Rockland Utils Inc | Investor Owned | Bundled | 211,011 | 23.31¢ | 31% |
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 25
| Technology | Capacity | Share |
|---|---|---|
| Hydro | 77 MW | 62% |
| Solar | 46 MW | 38% |
| Largest plants | Owner | Technology | MW | Since |
|---|---|---|---|---|
| Neversink | New York Power Authority | Hydro | 25 MW | 1953 |
| Grahamsville | New York Power Authority | Hydro | 18 MW | 1956 |
| Rio | Eagle Creek Renewable Energy, LLC | Hydro | 11 MW | 1927 |
| Swinging Bridge 2 | Eagle Creek Renewable Energy, LLC | Hydro | 8 MW | 1939 |
| West Delaware Tunnel Plant | Erie Boulevard Hydropower LP | Hydro | 8 MW | 1988 |
| Mongaup Falls | Eagle Creek Renewable Energy, LLC | Hydro | 7 MW | 1923 |
Planned generation 1
| Plant | Technology | MW | Status | Year | Owner |
|---|---|---|---|---|---|
| Cypert - Fallsburg I | Solar Photovoltaic | 5 MW | Under construction (≤50%) | 2027 | NY Fallsburg II, LLC |
The Sullivan County labor market
| Industry (2025) | Jobs | Average pay | Concentration vs U.S. |
|---|---|---|---|
| All industries | 30,789 | $58,618 | 1.00 |
| Construction | 1,348 | $103,944 | 0.83 |
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 Sullivan County
No data center, local measure or delayed project is on record in Sullivan County. New York has 35 local measures on record statewide, and 1 neighboring county has one: Wayne County.
Sullivan County and its neighbors
Of the 5 counties that border Sullivan County, Orange 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 |
|---|---|---|---|---|---|---|
| Sullivan County | 80,586 | ▲ 4.8% | 123 MW | 5 MW | — | — |
| Delaware County | 44,305 | ▼ 3.8% | 2 MW | — | — | — |
| Orange County | 417,669 | ▲ 4.5% | 2,754 MW | 178 MW | — | — |
| Pike County PA | 62,808 | ▲ 7.2% | — | — | 1 | — |
| Ulster County | 183,330 | ● 0.0% | 89 MW | — | — | — |
| Wayne County PA | 51,703 | ▲ 4.3% | 104 MW | 3 MW | — | 1 |
More of New York
Sullivan County, answered from the record
Who provides electricity in Sullivan County, New York?
2 utilities have service territory in Sullivan County in the EIA-861 2024 report: New York State Elec & Gas Corp, Orange & Rockland Utils Inc. The largest, New York State Elec & Gas Corp, charged residential customers 18.32¢/kWh on average in 2024.
What county is Thompson, NY in?
Thompson is in Sullivan County, New York. About 16,722 people live there (2025 Census estimate).
What county is Fallsburg, NY in?
Fallsburg is in Sullivan County, New York. About 15,156 people live there (2025 Census estimate).
What county is Mamakating, NY in?
Mamakating is in Sullivan County, New York. About 12,701 people live there (2025 Census estimate).
What power plants are in Sullivan County?
25 operating plants with 123 MW of capacity. The largest is Neversink (25 MW, hydro).
How much new power is planned in Sullivan County?
5 MW across 1 units in the August 2026 EIA-860M inventory, 5 MW of it under construction or built. The largest owner is NY Fallsburg II, LLC.
Are there data centers in Sullivan County?
The SAVRN Data Center Map has no data center in Sullivan County. The nearest activity on record is next door in Pike County.
Is Sullivan County adding jobs?
Employers counted 30,789 jobs in 2025 against 29,392 in 2019 (+4.8%, BLS QCEW). Construction went from 1,085 to 1,348.
Does Sullivan County have a data center moratorium?
No county-level measure is on record for Sullivan County. New York has 35 local measures statewide, listed on the state page.