MISO implemented a Market Alert regarding hot weather this week through Friday until 10PM. Additionally, all maintenance that could affect reliability at generation and transmission facilities has been recommended curtailed as well. (https://www.midwestiso.org/MarketsOperations/Notifications/Pages/ConservativeOperationsInitiate20130717014300.aspx)
I was looking at the real-time curve yesterday, and it was above the predicted demand by about 1MW. Today is looking spot-on: https://www.midwestiso.org/MarketsOperations/RealTimeMarketData/Pages/RealTimeTotalLoad.aspx.