JM Shafer Generating Station
Natural gas power plant in Weld County, Colorado. 396.9 MW of nameplate capacity across 7 generators, operated by Tri-State G & T Assn, Inc.
Also known as EIA plant 50707
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Key facts
- Capacity
- 396.9 MWNameplate
- Generators
- 7 operatingEIA-860M, August 2026
- Operating since
- June 1994First generator online
- Operator
- Tri-State G & T Assn, IncEIA operator ID 30151
- Grid
- PSCOBalancing authority PSCO
- Price nodes
- None linkedNo verified ISO node
- Location
- Weld County, CO40.0986, −104.7736
- EIA plant ID
- 50707EIA plant page
Data as of EIA-860M August 2026 (published 2026-09-24). Capacity is nameplate, not live output.
How much power JM Shafer produces
Free · EIA-923Net generation, 2025
717 GWh
716,612 MWh, final
Capacity factor, 2025
20.6%
2024: 28.1%
January to July 2026
427 GWh
Provisional
Range, 2015 to 2025
0.4–1.1
TWh a year. Low 2017, high 2023
| Year | Net generation, MWh | Capacity factor | Months reported |
|---|---|---|---|
| 2000 | 653,366 | Not reported | 12 of 12 |
| 2001 | 563,845 | Not reported | 12 of 12 |
| 2002 | 746,020 | Not reported | 12 of 12 |
| 2003 | 865,289 | Not reported | 12 of 12 |
| 2004 | 757,421 | Not reported | 12 of 12 |
| 2005 | 729,721 | Not reported | 12 of 12 |
| 2006 | 731,171 | Not reported | 12 of 12 |
| 2007 | 1,003,125 | Not reported | 12 of 12 |
| 2008 | 930,900 | Not reported | 12 of 12 |
| 2009 | 881,618 | Not reported | 12 of 12 |
| 2010 | 567,356 | 16.8% | 12 of 12 |
| 2011 | 517,654 | 15.3% | 12 of 12 |
| 2012 | 716,699 | 21.1% | 12 of 12 |
| 2013 | 608,466 | Not reported | 12 of 12 |
| 2014 | 584,017 | 16.8% | 12 of 12 |
| 2015 | 702,577 | 20.2% | 12 of 12 |
| 2016 | 547,556 | 15.7% | 12 of 12 |
| 2017 | 433,971 | 12.5% | 12 of 12 |
| 2018 | 784,004 | 22.5% | 12 of 12 |
| 2019 | 647,684 | 18.6% | 12 of 12 |
| 2020 | 912,521 | 26.2% | 12 of 12 |
| 2021 | 791,930 | 22.8% | 12 of 12 |
| 2022 | 894,219 | 25.7% | 12 of 12 |
| 2023 | 1,050,273 | 30.2% | 12 of 12 |
| 2024 | 979,599 | 28.1% | 12 of 12 |
| 2025 | 716,612 | 20.6% | 12 of 12 |
| 2026 (provisional, partial year) | 426,804 | 21.1% | 7 of 7 |
* 2026 covers January to July and is provisional. Capacity factor is net generation divided by nameplate capacity times the hours of each reported month.
Power prices and basis
Free accountNo verified ISO price node is linked to this plant, or its price history could not load.
Emissions
Free · EPA CAMPDCO₂, 2025
360,375
US short tons. 2024: 474,130
SO₂, 2025
2
US short tons
NOx, 2025
273
US short tons
CO₂ per MWh, calculated
0.50 t
About 1,006 lb per MWh
5 of 5 EPA units reported CO₂ in 2025 (S001, S002, S003, S004, S005), matched to EIA plant 50707 through the EPA–EIA crosswalk. The per-MWh rate is EPA CO₂ divided by EIA-923 net generation. The two reporting boundaries can differ.
Water use
Free · EIA-923 cooling, USGSWithdrawal, 2024
159
million gallons
Consumption, 2024
159
million gallons
Source
GW
Ground, Fresh. Induced-draft tower
Watershed stress
Very low/none · 0.165
USGS SUI, HUC12 Mose Davis Lake-South Platte River
12 of 12 cooling months report withdrawal. Groundwater user; SUI describes surface water and is context only. Blank volumes are unreported, not zero.
Generators
Free · EIA-860M| Generator | Technology | Nameplate MW | Online since |
|---|---|---|---|
| LMA | Natural Gas Fired Combined Cycle | 58.5 | June 1994 |
| LMB | Natural Gas Fired Combined Cycle | 58.5 | June 1994 |
| LMC | Natural Gas Fired Combined Cycle | 58.5 | July 1994 |
| LMD | Natural Gas Fired Combined Cycle | 58.5 | July 1994 |
| LME | Natural Gas Fired Combined Cycle | 58.5 | July 1994 |
| STA | Natural Gas Fired Combined Cycle | 52.2 | June 1994 |
| STB | Natural Gas Fired Combined Cycle | 52.2 | June 1994 |
Ownership and offtake
ProOwnership and offtake are part of Pro
Owners and their shares, parent companies, and power purchase agreements with their buyers. EIA-860M lists Tri-State G & T Assn, Inc as the operator, which is not always the owner.
Modeled data
ProPro adds modeled values for this plant. Everything above stays free.
Generation potential vs reported
Monthly potential at seasonal net capability, next to EIA-923 output. Shows how much of the plant's capability was used.
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Power plants near JM Shafer
More plants operated by Tri-State G & T Assn, Inc
Questions about JM Shafer
How much power does JM Shafer Generating Station produce?
JM Shafer Generating Station reported 716,612 MWh (717 GWh) of net generation in 2025, a 20.6% capacity factor on 396.9 MW of nameplate capacity. From January to July 2026 it reported 427 GWh, which is provisional.
Where is JM Shafer Generating Station?
JM Shafer Generating Station is in Weld County, Colorado, at 40.0986, −104.7736. It is in the Public Service Company of Colorado balancing area (PSCO).
Who operates JM Shafer Generating Station?
EIA-860M for August 2026 lists Tri-State G & T Assn, Inc as the operator (EIA operator ID 30151). The operator is not always the owner.
When did JM Shafer Generating Station start operating?
Its first generator began operating in June 1994, according to EIA-860M.
Sources
- EIA-860 2025 (final) and EIA-860M August 2026: plant, generators, capacity, operator and location
- EIA-923 monthly net generation, 2000 to July 2026 (2026 provisional)
- EPA CAMPD annual emissions through the EPA–EIA crosswalk, 1995 to 2025
- EIA-923 cooling water 2024 and the USGS surface water supply and use index, Water years 2010-2020 (Oct 2009 to Sep 2020), mean of monthly values
Page updated 2026-10-04 from the InfraMap data build. Methodology · Data sources · EIA plant page