The California Independent System Operator (ISO) has prepared this 2022-2023 Transmission
Plan as part of its core responsibility to identify and plan the development of solutions to
comprehensively meet the future needs of the ISO-controlled transmission grid. The plan was
prepared through the annual transmission planning process (TPP) that culminates in an ISO
Board of Governors (Board) approved, comprehensive transmission plan.
The need for additional generation of electricity over the next 10 years has escalated rapidly in
California as it continues transitioning to the carbon-free electrical grid required by the state’s
clean-energy policies. This in turn has been driving a dramatically accelerated pace for new
transmission development in current and future planning cycles. To help ensure we have the
transmission in place to achieve this transition reliably and cost-effectively, the ISO’s 2022-2023
Transmission Plan reflects a much more strategic and proactive approach to better synchronize
power and transmission planning, interconnection queuing and resource procurement and is put
forward in close coordination with the state’s primary energy planning and regulatory entities,
the California Public Utilities Commission (CPUC) and the California Energy Commission