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, Galen G. Vetter, Chief Executive Officer of the FRANKLIN CUSTODIAN FUNDS (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 3/31/2008 (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: 5/27/2008

                            /S/GALEN G. VETTER
                            Galen G. Vetter
                            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, Laura F. Fergerson, Chief Financial Officer of the FRANKLIN CUSTODIAN FUNDS
(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 3/31/2008 (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: 5/27/2008

                            /S/LAURA F. FERGERSON
                            Laura F. Fergerson
                            Chief Financial Officer and Chief Accounting Officer