![]() ![]() Whenever the purple line is above the turquoise line, ERCOT can generate more than enough power for all homes and businesses. The solid turquoise line represents the actual demand (power consumption), which is based on measured data from the entire ERCOT grid. The official term used by ERCOT to describe this value is “Committed Capacity”. The solid purple line represents the actual electricity supply available from power plants that were online at that time of the day, and also power plants that were acting as operating reserves. We will start by describing the two solid lines: ![]() You will notice there are five different lines on the graph: solid purple, solid turquoise, dotted dark purple, dotted light purple, and dotted turquoise. Everything to the right is a forecast of how the grid will behave the rest of the day.Everything to the left of the vertical line has already happened (historic data).As the day passes, the vertical line moves from left to right. The vertical gray line represents the current time.This graph displays a 24-hour period, and it compares the available generation capacity with the total consumption across the ERCOT grid (hour by hour). ![]()
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