Exhibit Designation Nature of Exhibit Previously Filed as Exhibit to: 4(a) Indenture (for unsecured debt securities), dated as of January 1, 1998, between APCo and The Bank of New York, As Trustee. Registration Statement No. 333-45927, Ex 4(a)(b) Registration Statement No. 333-49071, Ex 4(b) Registration Statement No. 333-84061, Ex 4(b)(c) Registration Statement No. 333-100451, Ex 4(b) Registration Statement No. 333-116284, Ex 4( b )( c ) Registration Statement No. 333-123348, Ex 4( b )( c ) Registration Statement No. 333-136432, Ex 4( b )( c )( d ) Registration Statement No. 333-161940, Ex 4( b )( c )( d ) Registration Statement No. 333-182336, Ex 4( b )( c ) Registration Statement No. 333-200750, Ex. 4( b )( c ) Registration Statement No. 333-214448, Ex. 4(b) 4(a)(1) Company Order and Officers Certificate to The Bank of New York Mellon Trust Company, N.A. dated May 11, 2017 of 3.30% Senior Notes Series X due 2027. Form 8-K, Ex 4(a) dated May 11, 2017 4(a)(2) Company Order and Officers Certificate to The Bank of New York Mellon Trust Company, N.A. dated March 6, 2019 of 4.50% Senior Notes Series Y due 2049. Form 8-K, Ex 4(a) dated March 6, 2019 10(a) Inter-Company Power Agreement, dated as of July 10, 1953, among OVEC and the Sponsoring Companies, as amended September 10, 2010. 2013 Form 10-K, Ex 10(a) 10(d) Consent Decree with U.S. District Court dated October 9, 2007, as modified July 17, 2019. Form 8-K, Ex. 10 dated October 9, 2007 Form 10-Q, Ex 10, June 30, 2013 Form 10-Q, Ex 10, June 30, 2019 *13 Copy of those portions of the APCo 2019 Annual Report (for the fiscal year ended December 31, 2019) which are incorporated by reference in this filing. *24 Power of Attorney. *31(a) Certification of Chief Executive Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002. *31(b) Certification of Chief Financial Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002. *32(a) Certification of Chief Executive Officer Pursuant to Section 1350 of Chapter 63 of Title 18 of the United States Code. *32(b) Certification of Chief Financial Officer Pursuant to Section 1350 of Chapter 63 of Title 18 of the United States Code. 101.INS XBRL Instance Document. The instance document does not appear in the interactive data file because its XBRL tags are embedded within the inline XBRL document. 101.SCH  XBRL Taxonomy Extension Schema. 101.CAL  XBRL Taxonomy Extension Calculation Linkbase. 101.DEF  XBRL Taxonomy Extension Definition Linkbase. 101.LAB  XBRL Taxonomy Extension Label Linkbase. 101.PRE  XBRL Taxonomy Extension Presentation Linkbase. E-6