Construction of Dworshak Unit 4 Infrastructure

5/6/2026: Adding attachements and provide Magnitude of Construction estimate: Magnitude of Constructio is estimated Between $250,000,000 and $500,000,000. ______________________________________________________ 4/13/26: Update to clarify one-on-one session dates: The multi-functional team within the Walla Walla District and Hydroelectric Design Center will be conducting one-on-one sessions May 4-5, 2026, you will be sent your assigned date and time for these two days. May 11, 2026, has been set aside for overflow sessions only. _____________________________________________________________________________________________________ Walla Walla District Dworshak Unit 4 Industry Day One-on-One Sessions Announcement Registration and General Information W912EF26RSN15 USACE Walla Walla District is developing multiple acquisitions to expand the generation capability of the Dworshak Dam Powerhouse by installing a fourth generating unit (Main Unit

4) and associated powerhouse structure extension. Dworshak Dam is located on the Clearwater River in Ahsahka, ID, approximately 50 miles east of Lewiston, ID. Additional

scope of work can be found on the following pages along with a list of

questions and desired information the Government would like to learn about your company regarding this project. This information is intended to provide you awareness of what the Government would like to learn. However, you are encouraged to share more information if you believe it will help the Government in developing the solicitation packages. The multi-functional team within the Walla Walla District and Hydroelectric Design Center will be conducting one-on-one sessions May 4-5, 2026, you will be sent your assigned date and time for these two days. May 11, 2026, has been set aside for overflow sessions only. , in order to share information on the government’s

requirements and preliminary acquisition strategy, as well as to obtain industry feedback. One-on-one sessions will be conducted virtually. Each company will be allotted one (1) hour for the one-on-one session. Please limit the number of company representatives to no more than three (3) attendees in order to facilitate effective one-on-one dialogue. The purpose of the one-on-one session is to answer

questions and allow the government to obtain specific feedback from your company’s representative. Marketing/capability briefings are not authorized during the one-on-one session. For our planning purposes, you are requested to provide the following information if you are interested in participating in the one-on-one session: Name of Company Name of each individual attending, his or her contact number and e-mail addresses Please provide the above information to [email protected] and [email protected] by April 28, 2026. Please include the title, “Company Name – Industry Day Attendees” in the email subject line. You will be notified of your scheduled one-on-one session within two (2) days of receipt of your request. If you have