N.H. Rev. Stat. Ann. § 363:1

There shall be a public utilities commission, which shall be an independent agency administratively attached to the department of energy pursuant to RSA 21-G:10. The chair of the commission shall have the powers and duties set forth in RSA 21-G:9. The commission shall be composed of 3 commissioners who shall be full-time employees and who shall engage in no other gainful employment during their terms as members. Their term of office shall be for 6 years. Of the 3 commissioners, one shall be an attorney and a member of the New Hampshire Bar and one shall have either background or experience or both in one or more of the following: engineering, economics, accounting or finance.