Exhibit 15 July 29, 1994 Idaho Power Company Boise, Idaho We have made a review, in accordance with standards established by the American Institute of Certified Public Accountants, of the unaudited interim financial information of Idaho Power Company and subsidiaries for the periods ended June 30, 1994 and 1993, as indicated in our report dated July 29, 1994; because we did not perform an audit, we expressed no opinion on that information. We are aware that our report referred to above, which is included in your Quarterly Report on Form 10-Q for the quarter ended June 30, 1994, is incorporated by reference in Registration Statement Nos. 33-65720, and 33- 51215 on Form S-3; and Post-Effective Amendment No. 1 to Registration Statement No. 2-99567 and Registration Statement No. 33-36947 on Form S-8. We also are aware that the aforementioned report, pursuant to Rule 436(c) under the Securities Act of 1933, is 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. DELOITTE & TOUCHE Portland, Oregon