Why don't the turbine blades spin constantly? To balance supply and demand.

The energy system requires a equal balance of energy demand and energy supply at all times. If there's too much electricity (high supply) and not enough usage (low demand), some wind turbines may need to be turned off to maintain balance across the system.

Various energy sources (wind, solar, battery, gas, coal, hydro) are needed to ensure a steady supply, regardless of weather conditions.

During the day, solar panels generate a lot of electricity, reducing the need for other sources. At night, when solar isn't available, wind turbines often take over, as winds can be stronger. This complementary relationship helps maintain a steady energy supply.

Sometimes, if the wind is too weak or too strong, turbines may stop to avoid damage. Turbines do also require maintenance and will occasionally be turned off for this reason as well.