50 C.F.R. § 221.58 When will the hearing record close?
Title 50 - Wildlife and Fisheries
(a) The hearing record will close when the ALJ closes the hearing, unless he or she directs otherwise. (b) Evidence may not be added after the hearing record is closed, but the transcript may be corrected under §221.56(b).
Title 50: Wildlife and Fisheries
PART 221—PRESCRIPTIONS IN FERC HYDROPOWER LICENSES
Subpart B—Hearing Process
Hearing, Briefing, and Decision
§ 221.58 When will the hearing record close?

