Public Service Co Of Oklahoma S-3 Shelf registration

Exhibit 23(a)

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We hereby consent to the incorporation by reference in this Registration Statement on Form S-3 of Public Service Company of Oklahoma of our report dated February 20, 2020 relating to the financial statements, which appears in the 2019 Annual Report, which is incorporated by reference in Public Service Company of Oklahoma's Annual Report on Form 10-K for the year ended December 31, 2019. We also consent to the reference to us under the heading “Experts” in such Registration Statement.

/s/ PricewaterhouseCoopoers LLP

Columbus, Ohio

December 16, 2020