JM Shafer Generating Station
Weld County, Colorado · EIA plant ID 50707 · Operator: Tri-State G & T Assn, Inc
Nameplate397MWSummer 272 MW
Generators7in service
Net generation771GWh12 mo to Aug 2026
Capacity factor23%gas/coal/oil units, summer MW
Heat rate9,271Btu/kWhfossil units, electric fuel, HHV
First online1994Runs as intermediate
The 12-month figures include preliminary EIA-923 months, which EIA revises. Final data runs through Dec 2025.
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 | 563.8 | — | — |
| 2002 | 746 | — | — |
| 2003 | 865.3 | 39.7% | 10,589 |
| 2004 | 757.4 | 32.8% | 9,698 |
| 2005 | 729.7 | 31.7% | 9,880 |
| 2006 | 731.2 | 31.7% | 9,869 |
| 2007 | 1,003.1 | 43.5% | 9,039 |
| 2008 | 930.9 | 40.3% | 9,482 |
| 2009 | 881.6 | 38.3% | 9,262 |
| 2010 | 567.4 | 24.6% | 9,667 |
| 2011 | 517.7 | 22.5% | 10,160 |
| 2012 | 716.7 | 31.0% | 9,527 |
| 2013 | 608.5 | 26.4% | 9,660 |
| 2014 | 584 | 25.4% | 9,957 |
| 2015 | 702.6 | 30.5% | 9,637 |
| 2016 | 547.6 | 23.7% | 9,597 |
| 2017 | 434 | 18.8% | 9,720 |
| 2018 | 784 | 32.9% | 9,296 |
| 2019 | 647.7 | 27.2% | 9,255 |
| 2020 | 912.5 | 38.2% | 8,942 |
| 2021 | 791.9 | 33.2% | 9,181 |
| 2022 | 894.2 | 37.5% | 9,211 |
| 2023 | 1,050.3 | 44.1% | 9,335 |
| 2024 | 979.6 | 41.0% | 9,336 |
| 2025 | 716.6 | 30.1% | 9,542 |
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 |
|---|---|---|---|---|---|---|---|---|
| LMA | Natural Gas Fired Combined Cycle | CT | 58.5 | 272 | Jun 1994 | Operating | — | coming soon |
| LMB | Natural Gas Fired Combined Cycle | CT | 58.5 | — | Jun 1994 | Operating | — | coming soon |
| LMC | Natural Gas Fired Combined Cycle | CT | 58.5 | — | Jul 1994 | Operating | — | coming soon |
| LMD | Natural Gas Fired Combined Cycle | CT | 58.5 | — | Jul 1994 | Operating | — | coming soon |
| LME | Natural Gas Fired Combined Cycle | CT | 58.5 | — | Jul 1994 | Operating | — | coming soon |
| STA | Natural Gas Fired Combined Cycle | CA | 52.2 | — | Jun 1994 | Operating | — | coming soon |
| STB | Natural Gas Fired Combined Cycle | CA | 52.2 | — | Jun 1994 | Operating | — | coming soon |
| GEN1 | — | CA | 52 | 44.7 | Jun 1994 | not_current | — | coming soon |
| GEN2 | — | CT | 37 | 31.8 | Jun 1994 | not_current | — | coming soon |
| GEN3 | — | CT | 37 | 31.8 | Jun 1994 | not_current | — | coming soon |
Owner / operator
Operator: Tri-State G & T Assn, Inc. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Tri-State G & T Assn, Inc | 100.0% | 397 MW |
Nearby plants
Within 80 km.
| Fort Lupton | 101 MW | 2 km |
| SR Jenkins Ft Lupton | 13 MW | 3 km |
| Davis Battery Storage | 12 MW | 5.6 km |
| Spindle Hill Energy Center | 420 MW | 9.7 km |
| Spindle BESS | — | 10.9 km |
| SR Platte Solar Farm | 16 MW | 11.6 km |