RSA 541-A:32 Intervention.

I. The presiding officer shall grant one or more petitions for intervention if:
(a) The petition is submitted in writing to the presiding officer, with copies mailed to all parties named in the presiding officer's notice of the hearing, at least 3 days before the hearing;
(b) The petition states facts demonstrating that the petitioner's rights, duties, privileges, immunities or other substantial interests may be affected by the proceeding or that the petitioner qualifies as an intervenor under any provision of law; and
(c) The presiding officer determines that the interests of justice and the orderly and prompt conduct of the proceedings would not be impaired by allowing the intervention.
II. The presiding officer may grant one or more petitions for intervent