ESS Tech, Inc.

Our corporate headquarters is located in Wilsonville, Oregon. The approximately 200,000 square foot facility contains both our corporate, engineering, and administrative functions as well as our automated and semi-automated battery manufacturing lines. During 2024, the facility had the capacity to manufacture approximately 560 MWh of batteries annually. The facility was also retooled to produce ESS’s new Energy Centers. We currently are in the process of commissioning a second automated battery manufacturing line and repurposing our original semi-automated line for research and development activities. This will result in a total battery manufacturing capacity of 1.05 GWh annually.

Over time, we plan to increase efficiency at the Wilsonville facility to scale manufacturing capacity up to 2.0 GWh through a combination of additional manufacturing lines as well as substantive improvements to the capacity of each battery produced. We also envision opening additional manufacturing facilities globally. This global expansion plan may include the following levers that are currently under consideration:

•Strategic investments in the supply chain to grow capacity;

•Production expansion to Europe and/or Australia; and

•Vertical integration of power module comportments.