EX-23 10 ex23a.txt EX. 23(A) - CONSENT OF INDEPENDENT ACCOUNTANTS 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 14, 2003 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, 2002. We also consent to the reference to us under the heading "Experts" in such Registration Statement. /s/ PricewaterhouseCoopers LLP Portland, Oregon February 6, 2004