Company: POR
Filing Date: 2025-07-25
Form Type: 424B5
Source: 0001140361-25-027364
Chunk: 1

Company: PORTLAND GENERAL ELECTRIC CO /OR/
Filing Date: 2025-07-25
Form: 424B5
Chunk 1
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 |     |    9 |
| DESCRIPTION OF DEBT SECURITIES                                   |     |   12 |
| DESCRIPTION OF STOCK PURCHASE CONTRACTS AND STOCK PURCHASE UNITS |     |   14 |
| DESCRIPTION OF FIRST MORTGAGE BONDS                              |     |   15 |
| PLAN OF DISTRIBUTION                                             |     |   21 |
| WHERE YOU CAN FIND MORE INFORMATION                              |     |   22 |
| INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE                  |     |   23 |
| LEGAL MATTERS                                                    |     |   24 |
| EXPERTS                                                          |     |   24 |

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#### TABLE OF CONTENTS

### ABOUT THIS PROSPECTUS SUPPLEMENT
This prospectus supplement and the accompanying prospectus are part of an automatic shelf registration statement that we filed with the U.S. Securities and Exchange Commission (“SEC”), as a “well-known seasoned issuer” as defined in Rule 405 under the Securities Act of 1933, as amended. This document contains two parts. The first part is this prospectus supplement, which describes the Plan and also adds to and updates information contained in the accompanying prospectus. The second part is the accompanying prospectus, which provides more general information, some of which may not apply to the Plan. If the description of the information relevant to the Plan varies between this prospectus supplement and the accompanying prospectus, you should rely on the information in this prospectus supplement.

Both this prospectus supplement and the accompanying prospectus include or incorporate by reference important information about us, our common stock and other information you should know before investing in our common stock. Before purchasing any shares of common stock, you should carefully read both this prospectus supplement and the accompanying prospectus, together with the additional information described under the heading “Where You Can Find More Information” and “Incorporation of Certain Documents by Reference.”

You should rely only on the information contained or incorporated by reference in this prospectus supplement and the accompanying prospectus. We have not authorized anyone to provide you with different information. If anyone provides you with different or inconsistent information, you should not rely on it. You should not assume that the information provided in this prospectus supplement, the accompanying prospectus, the documents incorporated by reference, or any other offering material is accurate as of any date other than the date on the front of those documents, as applicable. Our business, financial condition, results of operations and prospects may have changed since that date