Notrees Windpower Hybrid
Ector County · ERCOT
Notrees Windpower Hybrid is a hybrid wind and battery storage facility with 188.5 MW of EIA-reported operating capacity and 24 MWh of reported storage energy capacity in Ector County, Texas, registered as EIA Plant ID 56961. Commercial operation began in April 2009.
Overview
Key fields
- Generation / storage
- 188.5 MW total / 24 MWh storage
Reported plant capacity and configuration.
- Technology
- Wind + battery storage
Primary generation technology.
- Registry anchor
- Plant 56961
Ector County · ERCOT
- Storage duration
- 0.7 hours
Battery subsystem rating.
- Operating status
- Operating
Notrees Windpower Hybrid is operating.
- Commercial operation
- April 2009
Best-supported operating milestone.
- Resource stack
- 3 resources
NWF_ESR1 · NWF_NWF1 · NWF_NWF2
Profile
- Grid role
- Utility-scale wind generation in ERCOT's energy-only market.
- Physical build
- Notrees Windpower Hybrid (EIA Plant 56961) is a hybrid wind + battery site comprising multiple wind turbine strings and an on-site battery energy storage system: 55 Vestas V82 turbines (1.65 MW each), one Vestas 1-V90 experimental turbine (≈1.86 MW), 40 GE 1.5-MW turbines, and a 36 MW / 24 MWh Xtreme Power Dynamic Power Resource composed of 24 Dynamic Power Modules (each 1.5 MW / 1.0 MWh) with one Power Unit (PCS) per module. The DPR modules were installed inside a building (not in shipping containers) on site.
Structured profile
- Reported capacity
- 153 MW wind + 36 MW storage
Separate operating technologies
- Energy
- 24 MWh
0.7-hour storage duration
- Operating status
- operating
Notrees Windpower Hybrid is operating.
- Location
- Ector County
ERCOT
- Asset role
- wind
ERCOT · Ector County
- Owner
- Duke Energy (Duke Energy Corporation)
Global Energy Monitor (which cites EIA/EIA-860 data) lists the owner as Duke Energy Corp [100%], and Duke Energy's own press release refers to the Notrees Windpower Project as a Duke Energy Renewables asset. These statements together support naming Duke Energy (Duke Energy Corporation) as the public owner.
- Commercial operation
- 2009-04-01
The best-supported single-date for the plant's initial commercial operation (first unit online) is therefore 2009-04-01.
Units and generators
Operating generator records and technology attributes reported through EIA-860.
| Generator | Capacity | Technology | Operation | Status |
|---|---|---|---|---|
| BATT | 36 MW 36 MW summer | Batteries Electricity used for energy storage · BA | Dec 2012 | Operating |
| GE | 60 MW 60 MW summer | Onshore Wind Turbine Wind · WT | Apr 2009 | Operating |
| VESTA | 92.5 MW 92.5 MW summer | Onshore Wind Turbine Wind · WT | Apr 2009 | Operating |
Performance
Monthly EIA generation history and recent market-resource behavior where linked telemetry is available.
Peer context
- Technology capacity
- 152.5 MW
- National rank
- #429
- TX rank
- #140
Monthly generation
Download CSVMonthly generation is reported through EIA-923. Capacity factor uses the current EIA nameplate capacity and is shown only for complete calendar years.
ERCOT disclosed dispatch
3 ERCOT market resources · Battery / storage, Wind
Dispatch
3 mo through May 22, 2026Cycles/day is discharged energy vs. usable capacity (~7 MWh). Capacity factor is avg discharge vs. peak.
Output by hourlocal time · 90 days through May 22, 2026
Latest disclosed outputhourly · 2 weeks ending May 22, 2026
Generation from ERCOT's 60-Day SCED Disclosure (≈60-day lag), summed over this site's market resources.
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.
Market registration
ERCOT public disclosuresOperating context
ERCOT market recordsNearby substations
HIFLD infrastructure inventoryRelated 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
Drag organizations to explore the network. Select a node to pin its details and available page link.
Parties and identifiers
| Relationship | Entity | Basis |
|---|---|---|
| Market resources | NWF_ESR1, NWF_NWF1, NWF_NWF2 | Linked ERCOT resources. |
| Grid selection | plant:plant-56961 | Canonical asset page /ercot/assets/plant/notrees-windpower-hybrid. |
Reporting portfolio
| Largest reported plants | Capacity | State |
|---|---|---|
| Frontier Windpower II | 351.8 MW | OK |
| Pisgah Ridge Solar, LLC | 250 MW | TX |
| Mesquite Creek Wind | 211.2 MW | TX |
| Ledyard Windpower, LLC | 207 MW | IA |
| Mesteno | 201.6 MW | TX |
| Los Vientos Wind 1B | 201.6 MW | TX |
| Rambler | 200 MW | TX |
| Los Vientos Windpower IV | 200 MW | TX |
Portfolio membership follows the latest EIA-860 reporting entity. It does not imply ultimate ownership.
View full reporting portfolioTimeline and sources
Project milestones and public references behind the asset profile.
Project timeline
- DOE grant announced / Duke match announcedSource
Duke Energy announced plans in late 2009 to match a $22 million grant from the U.S. Department of Energy (ARRA) to support installation of large-scale batteries at the Notrees wind site.
- Generators enter operationEIA-860
EIA-860 lists generator GE, generator VESTA with this operating date.
- Wind plant first unit onlineSource
EIA record reports the plant’s first unit entered service on April 1, 2009; the project is listed as an operational EIA plant (Plant ID 56961).
- Battery system testing completed; BESS operationalSource
The 36 MW battery energy storage and power management system completed testing and became fully operational in December 2012.
- Latest disclosed generation interval
ERCOT SCED disclosure is delayed, so plant performance windows end at the latest disclosed interval.
Sources
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