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Short-Term Reserves (fka IR010) MSC-2018-8

Last Modified - 02/08/2023
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For help getting started with Short-Term Reserve, check out the Short-Term Reserve Fast Facts documents in the Documents/Whitepapers section of this page.

Short-term capacity, which can provide energy within a relatively short period of time (e.g. 30 minutes), is an important tool for maintaining reliability, providing the ability to manage capacity needs that may not be addressed by Operating Reserves and the Ramp Capability Reserve product. This project explores options, including existing and/or new pricing mechanisms, for ensuring the availability of short-term capacity in an efficient manner to address Voltage and Local Reliability (VLR), regional, and system-wide requirements. 

This issue was submitted by Potomac Economics, MISO's Independent Market Monitor (IMM) and is synonymous with State of the Market (SOM) recommendations 2016-4 and 2014-2.

(Issue number formerly IR010)




Next Update


IM SOM Recommendation



MISO Roadmap




MISO reviewed STR performance and settlement impacts as part of formal post-implementation validation at the January MSC. MISO reported that that STR is performing as designed with minimal impact to overall market settlements. Ongoing analysis and potential refinements will be considered in the future similar consistent with other MISO market products.


MISO submitted Tariff revisions to enhance the demand curves for the Short-Term Reserve (“STR”) and Up Ramp Capability products.


Due to software implementation delays, MISO filed a request for waiver of certain Tariff provisions until Sep. 28, 2022, for Short Term Reserves.


MISO submitted an answer in response to the protested filed in the November 22, 2021 filing of revisions to MISO’s Tariff reflecting the inability of MISO’s systems to clear SER – Type II, and storage Resources eligible to be SER – Type II but register as DRR – Type II for off-line Supplemental Reserve and off-line Short-Term Reserve.


MISO submitted a limited waiver request of certain Tariff provisions regarding the provision by Stored Energy Resources – Type II, as well as by storage Resources that are otherwise eligible to be registered as SER–Type II but instead register as Demand Response Resource –Type II.


MISO submitted Tariff revisions to reflect the fact that MISO’s systems currently do not have, and cannot feasibly acquire, the capability to clear Offers of Stored Energy Resources – Type II to provide off-line Supplemental Reserve and off-line Short-Term Reserve; and that this limitation also applies to storage Resources that are otherwise eligible to be registered as SER – Type II but instead register as Demand Response Resources – Type II.


At the November 4 Market Subcommittee (MSC), MISO reported that production operation of Short-Term Reserve (STR) is on track for delivery on December 7, 2021. MISO hosted a second STR workshop to discuss submitting offers in the new MUI 2.0 system. STR tariff filings/updates are still pending at FERC. MISO discussed the limitations of Electric Storage Resources (ESR) and Stored Energy Resource (SER) Type II to provide offline STR. MISO plans to make FERC filing (Tariff changes and/or waiver) to reflect that SER-II cannot be cleared to provide offline STR and offline Supp, and issue will be addressed in connection with ESR implementation.


MISO submitted Tariff revisions to ensure that the Short-Term Reserve (“STR”) product, scheduled to take effect on December 7, 2021, will not be prioritized over Regulating Reserve in MISO’s markets. MISO requests that these Tariff revisions be made effective on May 1, 2022, when the necessary software to implement the proposed Tariff revisions will be in place.


MISO submitted a true-up to the Tariff revisions regarding the market procurement of Short-Term Reserve. On October 4, 2019, MISO filed proposed Tariff revisions in Docket No. ER20-42-000 to establish the STR product and on January 31, 2020, the Commission issued an order accepting the Tariff provisions on STR, effective December 7, 2021.


MISO submitted Tariff revisions to clarify the ineligibility of Dispatchable Intermittent Resources (“DIRs”) and Intermittent Resources to provide online Short-Term Reserve (“STR”). MISO requests that these Tariff revisions be given the same December 7, 2021 effective date as the currently accepted Tariff provisions on STR, and that the Commission issue an order on this filing by October 19, 2021 to facilitate MISO’s preparation to implement the requested Tariff changes.


MUI testing with STR enabled in CCE is planned to complete by mid-September. Production operation of the Short-Term Reserve market is on track for delivery in Q4 2021. Registration is now open for STR. Participants are encouraged to register for the August 13 workshop and participate in available training modules.


MISO provided project key dates, and stakeholder engagement awareness for the Short-Term Reserve (STR) project. STR is on track for December 2021 go-live.


MISO provided an update on the Short-Term Reserve (STR) project. STR registration begins mid-June. MUI Testing with STR disabled in CCE will be late May and June. MUI Testing with STR enable in CCE will begin in July. Customer training will be available July thru October. Go live is set for December 7. MISO discussed the new products capabilities and defaults.


Build is in progress. Registration and testing expected to be available June 2021. The Short-Term Reserve Primer (previously STR-CD One Pager) is now posted and available.


Phase changed to Build. Design is complete. Software construction is expected to commence in Q3 of 2020.


Updated timeline by changing Q1 and Q2 2020 from Concept Design "CD" to Build "B" to reflect activity after the FERC order.


Order (#ER20-42-000) approved by FERC on January 31, accepting MISO's planned STR implementation on Dec. 7, 2021.


Voted a High priority as part of MISO's 2019 Integrated Roadmap prioritization process.


A project update was given at the Market Subcommittee Meeting. The Tariff revisions are targeted to file in September with a target go live of Q4 2021.


Reviewed Module and Schedule Tariff changes. Feedback on proposed changes due July 31. FERC Filing mid-August


Short-Term Reserves Workshop completed. Stakeholder feedback due by 2/15/19.


Name changed to "Short-Term Reserves". Forecasted implementation date changed to Q2 2021.


Name changed from Short-Term Capacity Pricing and Reliability Requirements to Short-Term Capacity Reserves


Updated provided to Market Subcommittee (MSC), including change of priority from medium to high.


This issue now includes IMM Recommendation 2016-4 to establish regional reserve requirements and cost allocation. Issue name changed to "Short-Term Capacity Pricing and Reliability Requirements".


Expected completion date changed to 2021 to reflect resource availability. Issue now encompasses MR028 Pricing for Voltage and Local Reliability (VLR) Commitments due to overlapping project profile and solution.


Updated information for the 2016 Market Roadmap ranking process.


Issue added to Market Roadmap. Project moved into Evaluation phase.