Neb. Rev. Stat. § 81-15,234

(1) In any action under the Nebraska Emergency Planning and Community Right to Know Act, the State of Nebraska, if not a party, may intervene as a matter of right. (2) In any action under the act, any person may intervene as a matter of right when such person has a direct interest which is or may be adversely affected by the action and the disposition of the action may, as a practical matter, impair or impede the person's ability to protect that interest.