Exhibit (b) CERTIFICATIONS CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350 AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 I, Jimmy D. Gambill, Chief Executive Officer of the FRANKLIN CUSTODIAN FUNDS, INC. (the "Registrant"), certify, pursuant to 18 U.S.C. Section 1350 as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that, to my knowledge: 1. The periodic report on Form N-CSR of the Registrant for the period ended 03/31/06 (the "Form N-CSR") fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and 2. The information contained in the Form N-CSR fairly presents, in all material respects, the financial condition and results of operations of the Registrant. Dated: May 22, 2006 /S/JIMMY D. GAMBILL Chief Executive Officer - Finance and Administration CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350 AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 I, Galen G. Vetter, Chief Financial Officer of the FRANKLIN CUSTODIAN FUNDS, INC. (the "Registrant"), certify, pursuant to 18 U.S.C. Section 1350 as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that, to my knowledge: 1. The periodic report on Form N-CSR of the Registrant for the period ended 03/31/06 (the "Form N-CSR") fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and 2. The information contained in the Form N-CSR fairly presents, in all material respects, the financial condition and results of operations of the Registrant. Dated: May 22, 2006 /S/GALEN G. VETTER Chief Financial Officer