Tenn. Code Ann. § 65-2-118: Disposition of petitions for rehearing

The commission may, in its discretion, set the petition down for hearing or enter an order with reference to the petition without a hearing; provided, that in any event the commission shall dispose of the petition within thirty (30) days after filing thereof. If the commission enters no order disposing of the petition within the thirty-day period, the petition shall be deemed to have been denied as of the expiration of the thirty-day period.