N.H. Code Admin. R. Puc 204.24
If no rehearing has been requested, a decision by the commission shall become final 31 days after issuance. If a decision has been made on a request for rehearing, the decision shall be final 31 days after issuance unless a timely appeal of the decision has been filed with a court having appellate jurisdiction over commission decisions.
Source. #14184, eff 1-24-25