Wis. Admin. Code Public Service Commission PSC 112.04
No electric utility may begin construction, install or place in operation an initial interconnection with the transmission system of another electric utility, with which it has no existing transmission interconnections, without the commission's prior approval under s. PSC 112.07. Any subsequent interconnection by mutual agreement with the same electric utility does not require commission approval except as provided in s. PSC 112.05. The electric utility shall, however, report each subsequent interconnection to the commission at least 90 days before it begins construction. The report shall include a description of the project, its location, the estimated gross cost, and a discussion of the need. Electric utilities may, without commission authorization, establish temporary or emergency interconnections between their systems by mutual agreement, but shall promptly report such interconnections to the commission within 10 days of the date established and the date discontinued.
Wis. Admin. Code Public Service Commission PSC 112.04