The California ISO has published the final 2021 Participating Transmission Owner (PTO) Per Unit Cost Guides to the process webpage at https://stakeholdercenter.caiso.com/RecurringStakeholderProcesses/Participating-transmission-owner-per-unit-costs-2021.
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.
Materials related to the annual PTO Per Unit Costs process are also available on the webpage linked above.
