Short-Term Reserve (STR) is a 30-minute rampable generation capacity product 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.

Short Term Reserve Fast Facts: Primer. 

Additional information is available from the Short-Term Reserves Issue Tracker (IRO10) on the MISO website.