DeCordova Energy Storage System
DeCordova Energy Storage Facility / GranburyTX
How do you build the largest energy storage facility in the state of Texas?

Mortenson was chosen as the EPC contractor for the DeCordova Energy Storage system for Sungrow and Vistra in Granbury, Texas. At energization, the DeCordova project is the largest energy storage project in the state. The project will strengthen the grid in Texas by providing resiliency services by being co-located on the Luminant (a subsidiary of Vistra) DeCordova gas power plant.

Mortenson was the engineering, procurement and construction contractor for the facility, which consists of 260MW/260MWh of battery energy storage using lithium iron phosphate (LFP) technology and full integration of the energy management system. Interconnecting the battery storage system to the power grid is a 138kV substation that Mortenson built and tied in to the existing plant substation.

The DeCordova project consists of more than 22,000 batteries in 86 enclosures. Construction commenced in February of 2021 and completed in April of 2022.

Facts And Figures



260MW / 260MWh

Standalone Energy Storage


Delivery Methods

Engineer, Procure, Construct

The Team