The sites below are just a sample of larger companies that have structured internship programs in technology and business. Not just summer - some are year-round.
Search for companies in your target industries, and check out their Careers or Work for Us section, and get on their alerts so that you are the first to find out when internships are posted!
Pacific Northwest National Laboratory
University Careers site
Intel Student career site
Hillsboro, OR and other locations
Emerging Leaders – for students of color
PacificCorp Student Engineers
Career site (search for student engineer)
Department of Energy
Energy.gov list of internship programs
PAE Consulting Engineers
Mechanical/Electrical Engineering internships
Portland, Eugene, Seattle, SF