The commission may approve or otherwise allow to become effective applications from public utilities, subject to the commission's jurisdiction under the Public Utility Act [Chapter 62, Articles 1 to 6 and 8 to 13 NMSA 1978], for clean fuel rates, tariffs or other programs in order to encourage, develop or promote the development and use of natural gas and other clean fuels used as vehicular fuels. For the purposes of this section, clean fuel rates or tariffs are rates or tariffs set at a lower level than the corresponding service rate or tariff for which a customer would otherwise qualify.
NMS § 62-6-26.1