This is information in arrears. At 15:30 the affected generators were told verbally as well as in the SSL termination message to switch back from XML to normal setpoints...
As of 09/28/2017 15:30 EST MISO is terminating the ICCP Outage - Switch to XML declaration that was initiated at 09/28/2017 15:20 EST affecting the South Region area(s) of: EAI, EES, EMBA.
Market Participants in the affected area are to switch from XML back to ICCP at this time.
If you have any questions, please contact Client Relations at 1-866-296-6476, option 3. For technical support from the IT Operations Center, choose option 2.