Chokecherry and Sierra Madre — under construction

EnergyPosted 10/11/202610/11/2026 at 10:32 pm@EnergyDesk

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Chokecherry and Sierra Madre — under construction

Starts 08/31/2026

Chokecherry and Sierra Madre Wind, Carbon County, WY, United States

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Updates

2 since posted

This pin follows the news: it shows what is known now, and here is what changed and what brought it.

Edited10/12/2026 at 3:50 amby @ThePinGang
Summary
rewritten
Before
Published cost and electrical output
Project cost / investmentAbout USD 5 billionCost scopePublished project-specific capital/construction estimateCost source dateSource page undated; checked 2026-10-11Electrical generating capacity3,550 MW — Operator-reported electric generating capacity; not annual energy productionVerified project stageUnder construction
Project-specific research
The current operator project page reports approximately 3,550 MW and a $5 billion estimated cost for the wind power plant. This is the wind-project estimate, not the separate TransWest transmission cost. Physical project infrastructure construction is documented in the operator progress pages.
Published project-specific cost for Chokecherry and Sierra Madre: USD 5e+09. Basis: Published project-specific capital/construction estimate. Published electric generating project rating for Chokecherry and Sierra Madre: 3550 MW. Basis: Operator-reported electric generating capacity; not annual energy production. The developer describes Chokecherry and Sierra Madre as an approximately 3,550 MW wind project in Carbon County, Wyoming, with major federal and state permits secured and construction underway. This is the planned full-project capacity; it is not operating output.
The purpose page also lists a $5 billion estimated wind-project cost.
Scope and evidence
Retained only with documented physical construction, commissioning or 2025–2026 opening and published project-specific costs and electrical output. Costs use the published scope and currency; no benchmark estimates or currency conversions. MW is power capacity, not annual electricity production. Expected annual energy, where given, is a forecast. The map point is a reported plant/project location and may be approximate. Matching inventory views and excluded expansion proposals are not additive capacity.
Project images and credits
CCSM project infrastructure construction in 2025, distributed by Power Company of Wyoming. Credit: Power Company of Wyoming; photographer not named on source page. Source page; original operator image.
Edited10/12/2026 at 3:43 amby @ThePinGang
Headline
Chokecherry and Sierra Madre Wind — under constructionChokecherry and Sierra Madre — under construction
Lede
rewritten
Before
The developer describes Chokecherry and Sierra Madre as an approximately 3,550 MW wind project in Carbon County, Wyoming, with major federal and state permits secured and construction underway. This is the planned full-project capacity; it is not operating output.
Starts
Dec 31, 2031Aug 31, 2026
Ends
Dec 31, 2031Aug 31, 2026
Summary
rewritten
Before
Operator and regulator research, October 11, 2026
The developer describes Chokecherry and Sierra Madre as an approximately 3,550 MW wind project in Carbon County, Wyoming, with major federal and state permits secured and construction underway. This is the planned full-project capacity; it is not operating output.
The operator timeline distinguishes road construction beginning in 2016 from subsequent turbine development.
Earlier pin evidence / inventory snapshot
August 2026 inventory status
EIA August 2026 generator inventory, plant ID 58987: Chokecherry and Sierra Madre Wind, Carbon County, WY. Included 4 new/recent generating units with a summed nameplate rating of 3550.5 MW.
Generator I-A: Onshore Wind Turbine; 844.2 MW nameplate; summer rating 844.2 MW; (U) Under construction, less than or equal to 50 percent complete; planned operation 2031-12.
Generator I-B: Onshore Wind Turbine; 849.6 MW nameplate; summer rating 849.6 MW; (U) Under construction, less than or equal to 50 percent complete; planned operation 2031-12.
Generator II-A: Onshore Wind Turbine; 1303.2 MW nameplate; summer rating 1303.2 MW; (U) Under construction, less than or equal to 50 percent complete; planned operation 2032-12.
Generator II-B: Onshore Wind Turbine; 553.5 MW nameplate; summer rating 553.5 MW; (U) Under construction, less than or equal to 50 percent complete; planned operation 2033-12.
Date and location
EIA reports operation at month/year precision. The date is the last day of the earliest reported operation month/year, an estimated display boundary, not an exact opening day. Different units may have later dates. Future dates are operator-reported plans, not guarantees.
Coordinates are the EIA-reported plant point, not a verified entrance. New units at existing plants are included; the total excludes older units and battery/pumped storage. Capacity is a power rating, not annual energy output. Status was reported in August and may have changed since.
Project images and credits
CCSM project infrastructure construction in 2025, distributed by Power Company of Wyoming. Credit: Power Company of Wyoming; photographer not named on source page. Source page; original operator image.
- Published project evidencepowercompanyofwyoming.com95% CONFIDENCE
- Plant inventory or original project recordeia.gov95% CONFIDENCE

Comments

References 395% CONFIDENCEOverall confidence: 95%How well the pin's source and references back up its dates.Weighted average of how firmly 3 references, the source included, support the pin's start and end times; a reference counts half as much for every 180 days older than the newestShow all pins at 75% confidence or better

The first entry is always the pin's source. Overall confidence is a weighted average of how firmly each reference supports the start and end times used above; a reference counts half as much for every 180 days older than the newest.

[1]95%
Plant inventory or original project record
eia.gov· Posted Oct 12, 2026· Starts Aug 31, 2026 ✓· 33% of score
Documented physical milestone or dated progress/reporting marker. Period-end dates represent only the reported month/quarter; they do not invent an exact operation date. Source estimates are labelled and not treated as confirmed future opening dates.
[2]95%
Published project evidence
powercompanyofwyoming.com· Added Oct 12, 2026· Added by@ThePinGang· 33% of score
Published project-specific cost for Chokecherry and Sierra Madre: USD 5e+09. Basis: Published project-specific capital/construction estimate. Published electric generating project rating for Chokecherry and Sierra Madre: 3550 MW. Basis: Operator-reported electric generating capacity; not annual energy production. The developer describes Chokecherry and Sierra Madre as an approximately 3,550 MW wind project in Carbon County, Wyoming, with major federal and state permits secured and construction underway. This is the planned full-project capacity; it is not operating output.^[1]
[3]95%
Published project evidence
powercompanyofwyoming.com· Added Oct 12, 2026· Added by@ThePinGang· 33% of score
The purpose page also lists a $5 billion estimated wind-project cost.^[1]

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Published cost and electrical output

Project-specific research

Scope and evidence

Project images and credits

Operator and regulator research, October 11, 2026

Earlier pin evidence / inventory snapshot

August 2026 inventory status

Date and location

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Suggest a correction

Published cost and electrical output

Project-specific research

Scope and evidence

Project images and credits

Operator and regulator research, October 11, 2026

Earlier pin evidence / inventory snapshot

August 2026 inventory status

Date and location

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Suggest a correction

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Chokecherry and Sierra Madre — under construction

Published cost and electrical output

Project-specific research

Scope and evidence

Project images and credits

Project images and credits

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