EX-23 5 0005.txt EXHIBIT 23(A) EXHIBIT 23(A) CONSENT OF INDEPENDENT ACCOUNTANTS We hereby consent to the incorporation by reference in this Registration Statement on Form S-3 of our report dated February 18, 2000 relating to the financial statements and financial statement schedule, which appears in Northwest Natural Gas Company's Annual Report on Form 10-K for the year ended December 31, 1999. We also consent to the reference to us under the heading "Experts" in such Registration Statement. /s/ PricewaterhouseCoopers LLP PricewaterhouseCoopers LLP Portland, Oregon February 7, 2001