“Houston (Platts)–16 May 2018 612 pm EDT/2212 GMT.
The Electric Reliability Council of Texas footprint saw real-time prices jump to four-digit territory Wednesday afternoon as power demand rose above record May peakload with above-normal temperatures. Real-time prices spiked across the footprint as real-time prices for all hubs averaged nearly $1,500/MWh for the 15-minute interval that ended 4:45 pm CDT, after shooting up above $1,300/MWh two intervals prior.”

https://www.platts.com/latest-news/electric-power/houston/ercot-real-time-power-prices-spike-near-1500mwh-10427793