10 C.F.R. § 820.8
(f) Fees.
(2) If a subpoena is issued at the request of a person other than an officer or agency of the United States, the witness fees and mileage shall be paid by the person who requested the subpoena. However, at the request of the person, the witness fees and mileage shall be paid by the DOE if the person shows:
(h) Certification.
(j) Statements/testimony.
(l) Attorney.