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Short-Term Reserve (STR) is a 30-minute rampable generation capacity provided by online or offline resources to be converted to energy within the STR deployment period (30 minutes). It will be co-optimized with energy and ancillary services products. The product separately addresses market-wide, sub-regional, and local short-term reserve needs. MISO developed the STR product to provide a market-based solution for addressing short-term needs and align its markets with the operational challenges that drive STR needs.  MISO is planning a December 7, 2021 launch date. 

STR Registration – MUI API Changes

This document presents MUI API enhancements in support of Short-Term Reserve (STR) of the MISO Market system.

  • The Short-Term Reserve project does not require the addition of new MUI artifacts (i.e., APIs and/or UI pages). 
  • All requirements can be addressed via enhancement to existing artifacts.


The list below summarizes those API enhancements with STR changes:

1. Query Qualification Status (Existing)

  • The Query Qualification Status API will be modified to support the new Offline Short-Term Reserve Qualified flag. 
  • Add offlineShortTermQualified Boolean flag to message.

2. Submit/Query Market-Wide Demand Curves (Existing)

  • The Submit and Query Market-Wide Demand Curves APIs will be modified to include the new Market-Wide Demand Short-Term Reserves curve.
  • Add new demandCurveType of ShortTermReserve.
  • Note: The Submit Market-Wide Demand Curves API is internal only; the Query Market-Wide Demand Curves API includes both internal and public visibility.

3. Query Market-Wide Demand Requirements (Existing)

  • The Query Market-Wide Demand Requirements API will be modified to support the new short-term reserve demand requirement.
  • Add shortTermReserveRequirement to message.

4. Query Market Wide Summary (Existing)

  • The Query Market Wide Summary API will be modified to include the dispatched short-term reserve.
  • Add shortTermReserveMw to message.

5. Query Locational Results (Existing)

  • The Query Locational Results API will be modified to include the cleared Short-Term Reserve with MW, price, and capped attributes for a given resource/location.

6. Query Day-Ahead Prices (Existing)

  • The Query Day-Ahead Prices API will be modified to include the day-ahead market short-term reserve market clearing price for a given resource/location.
  • Add strMcp price property to message. 
  • Applies to both ExAnte and ExPost.

7. Query Day-Ahead Zonal Prices (Existing)

  • The Query Day-Ahead Zonal Prices API will be modified to include the day-ahead market short-term reserve market clearing price. 
  • Add strMcp property to zonal details. 
  • Applies to both ExAnte and ExPost.

8. Query Real-Time Prices (Existing)

  • The Query Real-Time Prices API will be modified to include the real-time market short-term reserve market clearing price for a given resource/location. 
  • Add strMcp price property to message. 
  • Applies to both ExAnte and ExPost.

9. Query Real-Time Zonal Prices (Existing)

  • The Query Real-Time Zonal Prices API will be modified to include the real-time market short-term reserve market clearing price. 
  • Add strMcp property to zonal details. 
  • Applies to both ExAnte and ExPost.

10. Query Dispatch (Existing)

  • The Query Dispatch API will be modified to include short-term reserve dispatch instructions. 
  • Add shortTermReserveDispatch object with MW and MCP attributes.

11. Submit/Query Defaults (Existing)

  • The Submit and Query Defaults APIs will be modified to include the offline short-term reserve limit, online short-term reserve dispatch status, and offline reserve short-term dispatch status depending on offer variant.
  • Online STR dispatch status will be applicable to GEN, EAR, and DRR Type II resources only. 
  • Offline STR dispatch status will be applicable to GEN and DRR Type I and II resources.

12. Submit/Query Schedule Offer (Existing)

  • The Submit and Query Schedule Offer APIs will be modified to include the new offline short-term reserve max unit limit, online short-term reserve dispatch status, offline short-term reserve dispatch status, and offline short-term reserve offer depending on offer variant.
  • Not all fields will be applicable to all resources.  Specifically, added fields will be applicable for resources as follows:
    • short-term reserve max unit limit (GEN and DRR2).
    • online short-term reserve dispatch status (GEN, DRR2, and EAR).
    • offline short-term reserve dispatch status (GEN, DRR1, and DRR2).
    • offline short-term reserve offer (GEN, DRR1, and DRR2).

13. Submit/Query RT Offer Overrides (Existing)

  • The Submit and Query Real-Time Offer Overrides APIs will be modified to include the offline short-term reserve max unit limit, online short-term reserve dispatch status, and offline short-term reserve dispatch status depending on offer variant.
  • Not all fields will be applicable to all resources.  Specifically, the added fields will be applicable for resources as follows:
    • short-term reserve max unit limit (GEN and DRR2).
    • online short-term reserve dispatch status (GEN, DRR2, and EAR).
    • offline short-term reserve dispatch status (GEN, DRR2, and DRR1).

14. Submit/Query IMM Resource Assignment (Existing)

  • The Submit (internal) and Query IMM Resource Assignment APIs will be modified to include the offline short-term reserve max unit limit and the offline short-term reserve offer (not including the offline short-term reserve dispatch status) depending on offer variant. 
Keywords: Short-Term Reserve; STR; Short term reserve; MUI; API
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