wind power plantERCOT · Shackelford Countyplant:plant-56483

Post Oak Wind LLC

Shackelford County · ERCOT

Post Oak Wind LLC is a wind power facility with 200 MW of EIA-reported operating capacity in Shackelford County, Texas, registered as EIA Plant ID 56483. Horizon Wind Energy LLC is the public owner or developer; Mesquite Wind LLC is the registered plant entity or operator. Commercial operation began in December 2007. The facility interconnects at Post Oak 2 substation (connects to ONCOR Long Creek Switching Station) at 138 kV.

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Overview

Key fields

Reported capacity: 200 MW
EIA-reported operating capacity; nameplate, seasonal, AC/DC, and unit ratings may differ.
Technology: Onshore Wind Turbine
Primary generation technology.
Registry anchor: Plant 56483
Mesquite Wind LLC · Shackelford County · ERCOT
Operating status: Operating
Post Oak Wind LLC is operating.
Grid connection: Post Oak 2 substation (connects to ONCOR Long Creek Switching Station)
138 kV · ONCOR
Commercial operation: December 2007
Best-supported operating milestone.

Profile

Grid role: Utility-scale wind generation in ERCOT's energy-only market.
Grid connection: Post Oak 2 substation (connects to ONCOR Long Creek Switching Station) · 138 kV · ONCOR.

Structured profile

Reported capacity: 200 MW
Onshore Wind Turbine
Interconnection: Post Oak 2 substation (connects to ONCOR Long Creek Switching Station)
138 kV · ONCOR
Asset role: wind
ERCOT · Shackelford County

Units and generators

Operating generator records and technology attributes reported through EIA-860.

Generator	Capacity	Technology	Operation	Status
1	200 MW 200 MW summer	Onshore Wind Turbine Wind · WT	Mar 2008	Operating

Performance

Monthly EIA generation history and recent market-resource behavior where linked telemetry is available.

Peer context

Technology capacity: 200 MW
National rank: #276
TX rank: #93

Monthly generation

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Latest 12 months

385.5 GWh

Reported net generation

Latest report

Apr 2026

EIA-923 monthly filing

2025 capacity factor

23.6%

Using current reported nameplate capacity

Monthly generation is reported through EIA-923. Capacity factor uses the current EIA nameplate capacity and is shown only for complete calendar years.

Grid and market context

Deterministic links to ERCOT market resources, price records, outage disclosures, queue records, and nearby infrastructure. Candidate joins remain labeled until corroborated.

Nearby substations

HIFLD infrastructure inventory

UNKNOWN304701

IN SERVICE · 138 kV

4.4 km

UNKNOWN302852

NOT AVAILABLE · 69 kV

4.7 km

TAP310577

IN SERVICE · 138 kV

5.0 km

UNKNOWN306861

IN SERVICE · 138 kV

5.0 km

TAP302508

IN SERVICE · 138 kV

7.3 km

Related parties and identifiers

Parties, market resources, and identifiers tied to this asset, with owner, operator, developer, EPC, compliance provider, and interconnecting entity roles kept separate.

Relationship graph

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AssetOwner / operatorContractor

Parties and identifiers

Relationship	Entity	Basis
Owner / developer	Horizon Wind Energy LLC	PUCT registration states Horizon owns 100% of Post Oak Wind LLC.
Grid selection	plant:plant-56483	Canonical asset page /ercot/assets/plant/post-oak-wind-llc.

Reporting portfolio

EIA reporting entity

Mesquite Wind LLC

Entity 54759

Operating portfolio

2 plants

1 states

Reported capacity

400 MW

Onshore Wind Turbine

Largest reported plants	Capacity	State
Post Oak Wind LLCCurrent	200 MW	TX
Mesquite Wind Power LLC	200 MW	TX

Portfolio membership follows the latest EIA-860 reporting entity. It does not imply ultimate ownership.

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Timeline and sources

Project milestones and public references behind the asset profile.

Project timeline

Jul 2007
Jul 2007
Expected start generating (developer filing)Source
PUC registration indicated the wind farm expected to begin generating electricity by July 2007 (developer/registration filing).
Dec 2007
Dec 2007
Planned Commercial OperationSource
PUC registration indicated the wind farm expected to be fully operational in December 2007 (developer/registration filing).
Mar 2008
Mar 2008
Generator enters operationEIA-860
EIA-860 lists generator 1 with this operating date.
Feb 9, 2026
Feb 9, 2026
ERCOT Interconnection AmendmentSource
A recorded ERCOT interconnection document (Amendment No.2, GIR 04INR0011a – POST OAK WIND (LONE STAR II)) is dated Feb 9, 2026 (administrative/interconnection filing).