Consent of D&T

We consent to the incorporation by reference in Registration Statement Nos. 333-114665 and 333-00973 on Form S-3 of our reports dated February 27, 2006, relating to the financial statements (and with respect to the report on those financial statements, expressed an unqualified opinion and included an explanatory paragraph concerning the adoption of new accounting pronouncements in 2003 and 2004) and financial statement schedule of Public Service Company of Oklahoma appearing in and incorporated by reference in the Annual Report on Form 10-K of Public Service Company of Oklahoma for the year ended December 31, 2005.