following general flat rate and meter rate rules shall not be construed to mean that any utility must have both flat rates and meter rates. A utility may adopt, subject to the approval of the Commission, either a flat rate or a meter rate schedule, or both. In addition to the general flat rate and meter rate rules, a utility may adopt, subject to the approval of the Commission, other rules to be designated as special rate rules, to fit local conditions.
Mont. Admin. r. 38.5.2506
Sec. 69-3-102, MCA; IMP, Sec. 69-3-102, MCA;