Spencer
Denton County, Texas · EIA plant ID 4266 · Operator: City of Garland - (TX)
Nameplate127MWSummer 122 MW
Generators2in service
Net generation20GWh12 mo to Dec 2025
Capacity factor2%gas/coal/oil units, summer MW
Heat rate16,451Btu/kWhfossil units, electric fuel, HHV
First online1966Runs as peaking
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 | 185.4 | 11.8% | 13,600 |
| 2002 | 45.6 | 2.9% | 13,466 |
| 2003 | 116.8 | 7.4% | 12,719 |
| 2004 | 6.9 | 0.5% | 13,876 |
| 2005 | 143.4 | 10.6% | 14,678 |
| 2006 | 181.9 | 16.6% | 13,960 |
| 2007 | 58.2 | 5.3% | 17,155 |
| 2008 | 29.8 | 2.8% | 15,629 |
| 2009 | 36.7 | 3.4% | 13,933 |
| 2010 | 26.2 | 2.5% | 13,932 |
| 2011 | 2.3 | 0.2% | 23,451 |
| 2012 | 27.4 | 2.6% | 14,177 |
| 2013 | 9.6 | 0.9% | 15,292 |
| 2014 | 4.6 | 0.4% | 17,397 |
| 2015 | 13.2 | 1.2% | 14,004 |
| 2016 | 17.3 | 1.6% | 14,448 |
| 2017 | 4.5 | 0.4% | 13,101 |
| 2018 | 9.4 | 0.9% | 15,021 |
| 2019 | 29.2 | 2.7% | 13,667 |
| 2020 | 2.5 | 0.2% | 15,954 |
| 2021 | 7 | 0.7% | 16,496 |
| 2022 | 22.5 | 2.1% | 15,884 |
| 2023 | 45.9 | 4.3% | 14,126 |
| 2024 | 10.8 | 1.0% | 16,050 |
| 2025 | 19.7 | 1.8% | 16,451 |
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 |
|---|---|---|---|---|---|---|---|---|
| 4 | Natural Gas Steam Turbine | ST | 61.1 | 61 | Jun 1966 | Operating | — | coming soon |
| 5 | Natural Gas Steam Turbine | ST | 65.4 | 61 | May 1973 | Operating | — | coming soon |
| 1 | Natural Gas Steam Turbine | ST | 12.6 | 12 | Jun 1955 | Retired Dec 2005 | — | coming soon |
| 2 | Natural Gas Steam Turbine | ST | 12.6 | 12 | Jul 1955 | Retired Dec 2005 | — | coming soon |
| 3 | Natural Gas Steam Turbine | ST | 22 | 22 | May 1962 | Retired May 2005 | — | coming soon |
Owner / operator
Operator: City of Garland - (TX). Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| City of Garland - (TX) | 100.0% | 127 MW |
Nearby plants
Within 80 km.
| Denton Power LLC | retired | 2.9 km |
| Denton Energy Center | 226 MW | 9.8 km |
| Noble Solar | 400 MW | 14.2 km |
| CoServ Community Solar Station | 2 MW | 14.3 km |
| BKV-BPP Ponder Solar | 3 MW | 14.6 km |
| Lewisville | 3 MW | 19.5 km |