February 10, 2016



Requested Client Action

Request for Comment


Market Rules and Market Design

Regional Integration



Transmission Access Charge Options Straw Proposal and Impact Assessment Tool Posted




The California ISO has published the straw proposal and an impact assessment tool for the Transmission Access Charge (TAC) Options initiative.  Please submit comments by March 10, 2016.



Main Text

The ISO has published the straw proposal and an impact assessment tool for the TAC Options initiative on its website. The straw proposal describes how the ISO proposes to revise its TAC structure to integrate new participating transmission owners into its balancing authority area. The proposal is available at


The impact assessment tool is a spreadsheet model that enables users to estimate impacts on TAC rates that would result from integrating hypothetical additional new participating transmission owners and new regional transmission projects.  The ISO has also posted a user guide to accompany the impact assessment tool. The tool is available at and the guide at


The ISO will post a template for providing written comments on the straw proposal in the near future on the initiative webpage at Please submit comments to by close of business March 10.



For More Information Contact

Kristina Osborne at or (916) 608-7237


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