The Energy –Delta Time display shows the amount of energy generated by the chosen array over a series of 15 consecutive minute increments during the day. Each bar represents a quarter hour interval beginning and ending on the hour: 09.00 to 09.15; 09.15 to 09.30; etc. When viewing today's live data the last bar shown on the chart represents the current 15 minute interval. The bar will gradually grow in height (data is updated every minute more or less) until the end of the 15 minute period. Then, the next 15 minute bar will start to develop. The Energy - Delta Time bar chart takes on a similar shape to the Daily Power Instantaneous curve. It could be thought of as smoothing the power output curve which can vary markedly minute to minute when clouds are present.