10 C.F.R. § 609.12

(a) Where conditions justify, in the sole discretion of the Secretary, DOE may require that an Applicant submit a preliminary credit assessment for the proposed project, reflecting the project without a Guarantee, from a nationally recognized statistical ratings organization.

(b) Where conditions justify, in the sole discretion of the Secretary, DOE may require that an Applicant provide a credit rating for the proposed project, and subsequently provide updated ratings, from a nationally recognized statistical ratings organization.