Home Stakeholder Engagement MISO Dashboard Using Storage as a Transmission Asset to Provide Market Services (fka IR088)

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Using Storage as a Transmission Asset to Provide Market Services (fka IR088) MSC-2020-1

Last Modified - 12/16/2022
2021 2022
Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4

Since April 2018, MISO and stakeholders have developed tariff revisions to acknowledge FERC policy that enables storage to be treated as a transmission asset. This issue largely was addressed in the Planning Advisory Committee, but also was discussed in such stakeholder groups as the Market Subcommittee and Reliability Subcommittee. 

MISO has indicated that in early 2020, it intends to begin the stakeholder process to develop the framework and corresponding tariff and BPM revisions to enable storage as transmission assets to be used to provide market services when available, which is in line with FERC’s 2017 policy statement “Utilization of Electric Storage Resources for Multiple Services When Receiving Cost-Based Rate Recovery” (PL17-2).

The use of a storage as transmission assets will be identified in the MTEP regional planning process, relied upon to address transmission needs and reflected in transmission models. 

This issue was submitted by American Transmission Company January 2020.

(formally known as (R088)


Next Update





MISO Roadmap



Status is Inactive as there are no planned stakeholder discussions.


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.