N.H. Rev. Stat. Ann. § 374:26

The commission shall grant such permission whenever it shall, after due hearing, find that such engaging in business, construction or exercise of right, privilege or franchise would be for the public good, and not otherwise; and may prescribe such terms and conditions for the exercise of the privilege granted under such permission as it shall consider for the public interest. Such permission may be granted without hearing when all interested parties are in agreement.