This chart illustrates how integrating the output from solar and wind energy producers is a challenge for Idaho Power.

This is a current look at Idaho Power’s actual energy demand over the past 48 hours, along with solar and wind generation over the same period. On most days, the volume of power from these sources does not closely follow the pattern of demand. Solar output peaks around midday or early afternoon while system demand peaks several hours later. Wind is often at a low point in the late afternoon and early evening when overall demand is peaking.

Also note the sporadic nature of wind and solar production, as reflected in the uneven appearance of the graph lines. Each time production from one source goes up or down, other resources must immediately be increased or decreased to keep overall system generation in line with customer demand.

The red line represents the nameplate capacity of wind generation on Idaho Power’s system. The chart reflects a three-hour delay, and is updated every 15 minutes. Note: Data is preliminary and subject to revision.