Wis. Stat. § 196.40

Every order or determination of the commission shall take effect the day after the order or determination has been filed and served by personal delivery, mail, electronic mail, or any other method that the commission determines is likely to reach the parties or their attorneys, to all parties to the proceeding in which the order or determination was made or to their attorneys, unless the commission specifies a different date upon which the order or determination shall be effective. After the effective date every order 44196.40 REGULATION OF PUBLIC UTILITIES or determination shall be on its face lawful and reasonable unless a court determines otherwise under s. 227.57.