REQUESTED ACTION
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Planning2023-2024 Transmission Planning Process: Approved Project Sponsor Selection Reports Posted
On May 16, 2025, the California ISO selected California Grid Holdings LLC (CalGrid), a wholly owned subsidiary of Viridon Holdings LLC as the approved project sponsor to finance, construct, own, operate, and maintain both the New Humboldt 500 kV Substation, with a 500/115 kV transformer, and 500 kV line to Collinsville [HVDC operated as AC] project and the New Humboldt to Fern Road 500 kV Line project but did not post the associated report.
Per ISO Tariff Section 24.5.5: Within 10 Business Days after selecting an Approved Project Sponsor(s) for a needed transmission solution, the CAISO will post on the CAISO website a report regarding the selection of the Approved Project Sponsor(s).
The project sponsor selection reports concluding the competitive solicitation process for these projects are available on the transmission planning process webpage on the ISO website.
Contact information
Questions concerning the sponsor report can be submitted to Transmission Competitive Solicitation at transmissioncompetitivesolicitation@caiso.com