Sec. 197.25. Operating revenue accounts, basis of entries

(a) Credits to the various revenue accounts shall be made monthly upon the basis of either: (1) gross tariff rates, or (2) net tariff rates, for electricity supplied or service rendered. If at gross rates, discounts taken shall be charged, or, if at net rates, discounts not taken shall be credited, to the same account. For basis of credits to cover electricity supplied to the operating municipality, see sections 197.24 and 197.33.

(b) The utility shall keep its records so that it can show separately for each class of service under option (1) the discounts taken, or under option (2) the discounts not taken. Corrections of overcharges and overcollections theretofore credited; authorized abatements, allowances, and other corrections to bring charges into conformity with service classifications as filed with the commission shall be charged to the revenue accounts to which they relate.