the following criteria, as determined by the Secretary: (1) Creditworthiness (A) In general Subject to subparagraph (B), the project shall be creditworthy, as determined by the Secretary, who shall ensure that any financing for the project has appropriate security features, such as a rate covenant, if applicable, and adequate coverage requirements, to ensure repayment. (B) Opinion letter (i) Preliminary rating opinion letter The Secretary shall require each applicant to provide a preliminary rating opinion letter from at least one rating agency indicating that the senior obligations of the project (which may be the Federal credit instrument) have the potential to achieve an investment-grade rating. (ii) Final rating opinion letters The Secretary or the Administrator, as applicable, shall require each project applicant to provide, prior to final acceptance and financing of the project, final rating opinion letters from at least one rating agency indicating that the senior obligations of the project have an investment-grade rating. (2) Eligible project costs The eligible project costs of a project shall be reasonably anticipated to be not less than $20,000,000. (3) Dedicated revenue sources The Federal credit instrument for the project shall be repayable, in whole or in part, from dedicated revenue sources that also secure or fund the project obligations. (4) Public sponsorship of private entities In the case of a project carried out by an entity that is not a State or local government or an agency or instrumentality of a State or local government, the project shall be publicly sponsored as demonstrated by certification of the same by an agency of the relevant State, inclusion in the relevant State’s official improvement plan or by other means acceptable to the Secretary. (d) Receipt of other Federal funding Receipt of a Federal grant or contract or other Federal funding to support an eligible project shall not preclude the project from being eligible for assistance under this Act. 6. Selection criteria (a)