Wis. Stat. § 196.375

Upon complaint by any party affected, setting forth that any grantee of a permit to develop hydraulic power and generate hydroelectric energy for sale or service to the public is not furnishing consumers of this state with adequate service at a reasonable rate as a result of sales of the energy outside of the state, the commission may declare any or all contracts entered into by the grantee for the sales null and void insofar as the contracts interfere with the service or rate. The commission may not make a declaration under this section except after a hearing and investigation and a recorded finding that convenience and necessity require the sale of a specified part or all such energy within this state.