Onancock Diesel Generation Facility
Accomack County, Virginia · EIA plant ID 60236 · Operator: Old Dominion Electric Coop
Nameplate4MWSummer 4 MW
Generators2in service
Net generation1GWh12 mo to Dec 2025
Capacity factor2%gas/coal/oil units, summer MW
Heat rate9,462Btu/kWhfossil units, electric fuel, HHV
First online2002Runs as rarely runs
Monthly net generation
EIA-923, all units at the plant. Net of station use; storage can go negative.
FinalPreliminary
Capacity factor by year
Net MWh ÷ (summer MW × hours), gas/coal/oil units. Each year uses that year's EIA-860 ratings; the hollow dot is the latest 12 months.
Heat rate by year
Electric fuel MMBtu × 1000 ÷ net MWh (Btu/kWh, HHV), fossil units only; CT + CA counted as one combined-cycle block.
Annual data table
| Year | Net GWh | Capacity factor | Heat rate (Btu/kWh) |
|---|---|---|---|
| 2015 | 0.3 | 0.8% | 9,194 |
| 2016 | 0.2 | 0.5% | 9,632 |
| 2017 | 0.1 | 0.3% | 9,585 |
| 2018 | 0.2 | 0.5% | 9,492 |
| 2019 | 0.2 | 0.7% | 9,671 |
| 2020 | 0.2 | 0.7% | 9,730 |
| 2021 | 0.5 | 1.3% | 9,477 |
| 2022 | 0.2 | 0.7% | 9,608 |
| 2023 | 0.1 | 0.4% | 9,648 |
| 2024 | 0.3 | 0.8% | 9,576 |
| 2025 | 0.6 | 1.7% | 9,462 |
Generators
EIA-860 (annual) with EIA-860M updates through Sep 2026. EIA-923 reports generation by plant, prime mover and fuel, not by unit, so unit-level output isn't shown.
| Gen ID | Technology | Prime mover | Nameplate MW | Summer MW | Online | Status | Planned retirement | OEM / model |
|---|---|---|---|---|---|---|---|---|
| ODG7 | Petroleum Liquids | IC | 2 | 2 | Nov 2002 | Operating (Standby / backup) | — | coming soon |
| ODG8 | Petroleum Liquids | IC | 2 | 2 | Nov 2002 | Operating (Standby / backup) | — | coming soon |
Owner / operator
Operator: Old Dominion Electric Coop. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Old Dominion Electric Coop | 100.0% | 4 MW |
Nearby plants
Within 80 km.
| Tasley | 27 MW | 4.6 km |
| Perdue Diesel Generation Facility | 4 MW | 5.7 km |
| Belle Haven Diesel Generation Facility | 4 MW | 22.7 km |
| Tangier | 2 MW | 25.5 km |
| Eastern Shore Solar, LLC | 80 MW | 25.7 km |
| Crisfield | 12 MW | 29.5 km |