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In simple words, this is the electricity supply expected to be available from power plants online, and power plants acting as reserves. The dotted dark purple line is the “forecast committed capacity”.The dotted turquoise line is the forecast demand, which can be described as the power consumption expected by ERCOT.To the right of the vertical gray line (current time of the day), there are three forecasts that are represented by dotted lines:

In cases where the grid operates with a tight margin between power supply and demand, you will notice that the purple and turquoise lines are very close. 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). To open the dashboard, you can click on the following link:Īs you can see, the ERCOT dashboard displays nine different charts: Here is a guide to the ERCOT dashboard, which describes the data displayed on their website in simple terms. However, the graphs and charts can be confusing at first. The dashboard tells you the margin between the available generation capacity and consumption, the risk of rolling blackouts, and other useful information.

ERCOT has an online dashboard that shows exactly how the power grid is operating at any given time. If you live in Texas, you have most likely heard the term “ERCOT real-time system conditions” in the news.