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Transmission access charge options

The current transmission access charge is a two-part rate for each megawatt hour of internal load and exports and is used to recover transmission revenue requirements. Revenue requirements for facilities rated 200 kV and above are recovered through a system-wide rate, while requirements for facilities rated below 200 kV are recovered via specific rates for each participating transmission owner. This initiative considers if the same structure would be appropriate should a transmission owner with a load service territory join the ISO as a participating transmission owner.



This initiative considered whether the ISO’s existing TAC design would be appropriate for a significantly expanded balancing authority area that would be formed by the integration of a large new participating transmission owner (PTO) with a load service territory. This initiative was superseded by the TAC Structure initiative.

​Market notices

Policy development