2025 Draft Participating Transmission Owner Per Unit Cost Guides Posted

The California ISO has posted the Draft Per Unit Cost Guides to the 2025 Participating transmission owner per unit costs recurring process webpage.

The ISO Generator Interconnection Procedures require that participating transmission owners update and publish per unit costs annually as part of the current interconnection study cycle for estimating the cost of facilities required to interconnect resources. The ISO annually publishes draft per unit costs to its website and will hold a public stakeholder meeting in May.

Please submit written comments by end of day April 30, 2025, through the ISO’s commenting tool using on the process webpage.