N.H. Rev. Stat. § 371:2-a
When ownership of land, upon or over which a public utility desires to erect facilities, cannot be ascertained without entry to do survey work, or, a public utility shall have filed a petition under RSA 371:1 with respect to a particular tract of land, in either case a public utility shall have the right to enter upon such land for the purpose of surveying and making such other investigation as is necessary to determine the locations of the boundaries of such land and of the facilities it desires to erect thereon or thereover, and to determine the title to, description of, or nature of such land. A public utility desiring to enter land in pursuance of this section shall notify by certified mail the owner or probable owner or owners thereof of its desire to enter for the purposes aforesaid at least 30 days prior to entry. Notification shall include identification of the utility seeking to enter the land, the time and date of the proposed entry, and the portion or section of land to be surveyed or investigated. Upon the date specified for entry, the persons conducting the survey or investigation shall present themselves to the property owner and show identification. The public utility shall pay the owner or owners of any land it shall enter in pursuance of the provisions of this section for any actual damage done upon entry.
RSA 371:2-a
1965, 90:1, eff. May 14, 1965. 2012, 2:2, eff. May 4, 2012.