Tasley
Accomack County, Virginia · EIA plant ID 3785 · Operator: Calpine Mid-Atlantic Generation LLC
Nameplate27MWSummer 30 MW
Generators1in service
Net generation3GWh12 mo to Dec 2025
Capacity factor1%gas/coal/oil units, summer MW
Heat rate15,660Btu/kWhfossil units, electric fuel, HHV
First online1972Runs 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) |
|---|---|---|---|
| 2001 | 30.3 | — | — |
| 2002 | 6.2 | — | — |
| 2003 | 4.2 | 1.8% | 17,577 |
| 2004 | 0.6 | 0.3% | 26,613 |
| 2005 | 1.9 | 0.9% | 20,827 |
| 2006 | 0.7 | 0.3% | 27,567 |
| 2007 | 1.3 | 0.6% | 20,708 |
| 2008 | -0.1 | -0.1% | — |
| 2009 | -0.5 | -0.2% | — |
| 2010 | 1 | 0.4% | 17,781 |
| 2011 | 0.4 | 0.2% | 26,853 |
| 2012 | 0.2 | 0.1% | — |
| 2013 | 0.3 | 0.1% | 18,244 |
| 2014 | 2.7 | 1.0% | 13,285 |
| 2015 | 2.4 | 0.9% | 15,567 |
| 2016 | 1.6 | 0.6% | 15,870 |
| 2017 | 0.7 | 0.2% | 18,865 |
| 2018 | 0.8 | 0.3% | 14,457 |
| 2019 | 0.7 | 0.3% | 15,166 |
| 2020 | 0.5 | 0.2% | 17,952 |
| 2021 | 0.3 | 0.1% | 18,670 |
| 2022 | 1.7 | 0.7% | 16,312 |
| 2023 | 2.3 | 0.9% | 17,240 |
| 2024 | 2.1 | 0.8% | 16,382 |
| 2025 | 2.6 | 1.0% | 15,660 |
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 |
|---|---|---|---|---|---|---|---|---|
| TAS | Petroleum Liquids | GT | 27 | 29.9 | Jun 1972 | Operating (Standby / backup) | — | coming soon |
Owner / operator
Operator: Calpine Mid-Atlantic Generation LLC. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Calpine Mid-Atlantic Generation LLC | 100.0% | 27 MW |
Nearby plants
Within 80 km.
| Onancock Diesel Generation Facility | 4 MW | 4.6 km |
| Perdue Diesel Generation Facility | 4 MW | 5.8 km |
| Belle Haven Diesel Generation Facility | 4 MW | 19.1 km |
| Tangier | 2 MW | 28.7 km |
| Eastern Shore Solar, LLC | 80 MW | 28.9 km |
| NASA Wallops Flight Facility Solar | 4 MW | 32.7 km |