Briefing on Notrees Windpower Hybrid

Notrees Windpower Hybrid, a 189 MW wind and battery storage facility, has experienced a significant 19% decline in generation over the past six months, despite a recent battery system upgrade.

Overview

• Project Name: Notrees Battery Storage Project (Windpower Engineering & Development, 2017-12-12)

• Location: Texas

• Status: Operating since 2009

• Developer: Duke Energy Renewables (Windpower Engineering & Development, 2017-12-12)

• EPC Contractor: Younicos (Windpower Engineering & Development, 2017-12-12)

• Latest Milestone: upgraded battery system commissioned (Windpower Engineering & Development, 2017-12-12)

Fleet Details

• Technology: Hybrid plant with Batteries and Onshore Wind Turbines

• Generators: 3

• Capacity: 189 MW

• Parent Company: Duke Energy

• Ownership: Jointly owned by DEGS Wind 1 LLC and TE Notrees LLC

• Grid Connection: ERCOT (Texas) ISO, TRE NERC region, Electric Reliability Council of Texas, Inc. Balancing Authority

Operational Performance

• Annual Generation: 237 GWh

• Capacity Factor: 14.3%

• Recent Generation (2025-10 to 2025-12): 10 GWh, 19 GWh, and 19 GWh respectively

• Generation Trend: Down 19% over the past 6 months compared to the prior 6 months

Financial Profile

• Capital Expenditure (CapEx): $913/kW (eia_agg_cost)

The Notrees Windpower Hybrid plant demonstrates Duke Energy's commitment to hybrid wind and battery storage solutions, as evidenced by its upgraded battery system. Despite its innovative hybrid design, recent operational data indicates a notable decline in generation, warranting further investigation into performance drivers.