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 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 an owner decides not to proceed, they must provide a detailed explanation, allowing the PSC to determine who will construct the line based on various factors. The bill requires cost estimates and quarterly updates on construction costs to be submitted to the PSC, along with a report on costs charged to out-of-state energy consumers. The provisions of this bill will sunset after ten years, with specific sections being repealed at that time.