Assembly Bill 25 aims to modify the rights and responsibilities of incumbent transmission facility owners regarding the construction, ownership, and maintenance of regionally cost-shared transmission lines approved by the Midcontinent Independent System Operator (MISO). The bill establishes that an incumbent transmission facility owner, which includes transmission companies or utilities regardless of their principal place of business, has the right to construct and maintain these transmission lines that connect to their existing facilities. It also stipulates that if multiple owners are involved, the rights to the transmission line are shared proportionally unless otherwise agreed upon.

Additionally, the bill mandates that incumbent transmission facility owners must notify the Public Service Commission (PSC) of their intent to construct a regionally cost-shared transmission line within 90 days of MISO's approval or the bill's enactment. If they choose not to proceed, they must provide a detailed explanation. The bill requires these owners to submit cost estimates based on competitive bidding and to provide quarterly updates on construction costs until completion. Furthermore, it includes a provision for reporting costs charged to out-of-state energy consumers. The rights and responsibilities established by this bill will sunset after ten years.