The Notrees Wind Farm – Battery Energy Storage System is a 36,000kW energy storage project located in Goldsmith, Texas, US.

The electro-chemical battery energy storage project uses lithium-ion as its storage technology. The project was announced in 2009 and was commissioned in 2012.


The Notrees Wind Farm – Battery Energy Storage System was developed by Duke Energy Renewables. The project is owned by Duke Energy Renewables (100%), a subsidiary of Duke Energy.

The key applications of the project are electric energy time shift, frequency regulation and renewables capacity firming.

Contractors involved

Duke Energy Renewables and Xtreme Power have delivered the battery energy storage project.

Additional information

The Storage system has been funded with $21,806,219.00 by Federal/National American Recovery and Reinvestment Act of 2009 – RD&D under US Department of Energy, Office of Electricity – ARRA Grant. In order to maintain its’ high level of performance and extend the life of the system to continue to provide fast-acting stability to the ERCOT-grid for years to come, Duke Energy decided to re-power the battery technology, which has been using advanced lead acid battery technology since 2012. Over the next 18 months or so, Duke will be replacing the facility’s advanced lead-acid batteries, built by bankrupt startup Xtreme Power, with lithium-ion batteries from Samsung SDI.

About Duke Energy Renewables

Duke Energy Renewables Inc (Duke Energy Renewables) is a subsidiary of Duke Energy Corporation. The company owns, operates and maintains renewable energy. It primarily acquires, develops, builds and operates wind and solar renewable generation throughout the US. Duke Energy Renewables also offers operations and maintenance services to third-party renewables operators. The company owns and operates 2,900 MW capacity of renewable energy including 2,300 MW wind power and 600 MW solar power. Its project portfolio includes Cimarron II Windpower, Frontier Windpower, Ironwood Windpower, Shirley Windpower, Los Vientos II Windpower, Sweetwater Windpower, Ajo Solar, Bagdad Solar, Black Mountain Solar, Blue Wing Solar, Dogwood Solar and Everetts Wildcat Solar . Duke Energy Renewables is headquartered in Charlotte, the US.


All publicly-announced energy storage projects included in this analysis are drawn from GlobalData’s Power IC. The information regarding the projects are sourced through secondary information sources such as country specific power players, company news and reports, statistical organisations, regulatory body, government planning reports and their publications and is further validated through primary from various stakeholders such as power utility companies, consultants, energy associations of respective countries, government bodies and professionals from leading players in the power sector.