The ISO Generator Interconnection Procedures (ISO Tariff DD Appendix 5) requires participating transmission owners to annually update and publish per unit costs for use during the current interconnection study cycle for estimating the cost of facilities required to interconnect generation. Per unit costs are used to develop the cost for reliability and delivery network upgrades and participating transmission owner’s interconnection facilities. The ISO annually publishes draft per unit costs to its website, holds a stakeholder meeting and allows stakeholders to comment on the draft costs. The ISO publishes the final costs in the March to April time frame. The schedule for this annual process is located in Appendix 5 of the interconnection procedures.
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April 02, 2025 Draft cost guides posted
Apr 30, 2025 Comments due May 08, 2025* Meeting May 22, 2025* Comments due June 2025* Final cost guide posting |
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DCRT Draft 2025 Per Unit Cost Guide 04/02/2025
DSLK Draft 2025 Per Unit Cost Guide 04/02/2025
GLW Draft 2025 Per Unit Cost Guide 04/02/2025
HWT Draft 2025 Per Unit Cost Guide 04/02/2025
LSPGC Draft 2025 Per Unit Cost Guide 04/02/2025
PGE Draft 2025 Per Unit Cost Guide 04/02/2025
SCE Draft 2025 Per Unit Cost Guide 04/02/2025
SDGE Draft 2025 Per Unit Cost Guide 04/02/2025
VEA Draft 2025 Per Unit Cost Guide 04/02/2025
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Submit comments Due: Apr 30, 05:00 pm |