Company: POR
Filing Date: 2025-07-25
Form Type: 424B5
Source: 0001140361-25-027363
Chunk: 3

Company: PORTLAND GENERAL ELECTRIC CO /OR/
Filing Date: 2025-07-25
Form: 424B5
Chunk 3
---
 |     |   21 |
| WHERE YOU CAN FIND MORE INFORMATION                              |     |   22 |
| INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE                  |     |   23 |
| LEGAL MATTERS                                                    |     |   24 |
| EXPERTS                                                          |     |   24 |

We have not, and the agents and the forward purchasers have not, authorized any other person to provide you with different or additional information other than the information contained in or incorporated by reference into this prospectus supplement, the accompanying prospectus or any applicable free writing prospectus in making a decision about whether to invest in shares of our common stock. If anyone provides you with different or additional information, we cannot assure you as to its accuracy. This prospectus supplement and the accompanying prospectus do not constitute an offer to sell, or a solicitation of an offer to purchase, any securities in any jurisdiction where it is unlawful to make such offer or solicitation. You should assume that the information appearing in this prospectus supplement, the accompanying prospectus, any applicable free writing prospectus and the documents incorporated by reference herein or therein is accurate only as of their respective dates or on the date or dates that are specified in such documents. Our business, financial condition, liquidity, results of operations, funds from operations and prospects may have changed since those dates.

S-i

#### TABLE OF CONTENTS

### ABOUT THIS PROSPECTUS SUPPLEMENT
This document is in two parts. The first part is this prospectus supplement, which describes the specific terms of the offering of our common stock and also adds to and updates information contained in the accompanying prospectus and the documents incorporated by reference in the accompanying prospectus. The second part is the accompanying prospectus, which gives more general information, some of which does not apply to our common stock. If the description of our common stock or the offering of our common stock varies between this prospectus supplement and the accompanying prospectus, you should rely on the information in this prospectus supplement.

In addition, any statement in a filing we make with the Securities and Exchange Commission (the “SEC”) that is incorporated, or deemed to be incorporated, by reference herein and adds to, updates or changes information contained in an earlier filing we made with the SEC shall be deemed to modify and supersede such information in the earlier filing.

This prospectus supplement does not contain all of the information that is important to you. You should read the accompanying prospectus as well as the documents incorporated, and