evidence satisfactory to the Secretary that a Federal or State agency with jurisdiction and expertise has made an official determination, such as through a licensing proceeding, extending the useful life of a generating plant or transmission line pledged as collateral to or beyond the new final maturity date being requested by the borrower, or

a certificate from an independent licensed engineer concluding, on the basis of a thorough engineering analysis satisfactory to the Secretary, that the useful life of the generating plant or transmission line pledged as collateral extends to or beyond the new final maturity date being requested by the borrower.