Whenever any schedule shall be filed with the commission stating new and higher rates, fares, charges or prices, which the public utility filing the same proposes to put into force, the commission may investigate the reasonableness of such proposed rates, fares, charges or prices.
Source. 1911, 164:7. PL 242:5. RL 292:5. 1951, 203:46 par. 5, eff. Sept. 1, 1951.