An overview of Storage as Transmission Only Asset (SATOA) impacts to Market Settlements was provided at the Settlements User Group (SUG). SATOA provides transmission service and is excluded from Market participation. Energy transactions are settled to the extent necessary to provide transmission services. Annual net market revenues are used to offset transmission revenue requirements in Attachment O. The new Charge Type for SATOA energy transactions will be effective August 1, 2022.
MISO reviewed and has responded to Stakeholder feedback received in February. MISO agrees with many of the comments. Several Stakeholders oppose one-off approach and support development of a comprehensive policy. At this time, MISO will not pursue this topic and will revisit at a future date. This issue will be moved to the parking lot on the Dashboard. MISO noted that previous documents will be retained for future work on this topic.
Some remaining issues need to be fully addressed to allow SATOA to also provide market Services. Given several factors, including limited market participant interest, for now MISO proposes a one-off approach to allow SATOA market participation, rather than the conventional, comprehensive policy approach.
During the Market Subcommittee (MSC) reviewed feedback and discussed next steps. The initial SATOA filing agreed to consider a Phase II to address dual participation. There are several topics to address in Phase II efforts. MISO will continue discussion in first quarter 2022.
MISO discussed feedback and topics to consider enabling storage as transmission assets (SATA)to also provide market services. Stakeholder feedback responses focused on policy, compensation, and operational coordination. MISO agrees in general with most responses. MISO requested feedback on topics to consider enabling SATA to also provide market services.
MISO discussed identified issues to address so that storage assets can provide both transmission and market services. FERC Policy Statement allows participation as a transmission asset and to provide market services and SATOA mirrors principles in the Western Grid. Some potential issues that would need to be addressed were shared.
FERC accepted MISO's compliance filing for Storage as a Transmission Only Asset (PAC004) 9/23/2020, which was necessary to precede this effort. Framing is scheduled to begin sometime in Q2 2021; the project will remain "On Hold" until this is taken up at the MSC.
This issue will be on the active 2021 Integrated Roadmap work plan as a Low priority. The status is On Hold, as a timeline has not been set because work will depend on the outcome of PAC004 - ' Energy Storage as Transmission Reliability Asset.' FERC (Docket No. ER20-588) held a Technical Conference to discuss the issue on May 4 and has suspended SATOA tariff changes until August 11. MISO expects a FERC order by mid-August. Additional discussions will then be needed before work on this issue commences.
Issue submitted in Dec. 2019, passed to the MSC in Jan. 2020, and will be part of the 2021 Integrated Roadmap Work Plan prioritization process.