EXHIBIT 15.1

September 28, 2018

To the Board of Directors and Shareholders of

PacifiCorp

Portland, Oregon

We have reviewed, in accordance with the standards of the Public Company Accounting Oversight Board (United States), the unaudited consolidated interim financial information of PacifiCorp and subsidiaries for the three-month periods ended March 31, 2018, and 2017, and have issued our report dated May 7, 2018, and for the three- and six-month periods ended June 30, 2018 and 2017, and have issued our report dated August 3, 2018. As indicated in such reports, because we did not perform an audit, we expressed no opinion on that information.

We are aware that our reports referred to above, which were included in your Quarterly Reports on Form 10-Q for the quarters ended March 31, 2018 and June 30, 2018, are being used in this Registration Statement.

We also are aware that the aforementioned reports, pursuant to Rule 436(c) under the Securities Act of 1933, are not considered a part of the Registration Statement prepared or certified by an accountant or a report prepared or certified by an accountant within the meaning of Sections 7 and 11 of that Act.

/s/ Deloitte & Touche LLP