The commission may prescribe the necessary rules and regulations to place RCW 81.04.300 through 81.04.330 in operation. It may by general order, exempt in whole or in part from the operation thereof companies whose gross operating revenues are less than twenty-five thousand dollars a year. The commission may upon request of any company withhold from publication during such time as the commission may deem advisable, any portion of any original or supplementary budget relating to proposed capital expenditures.