Wind turbines cost almost nothing to run once they are built, so they offer power cheaply whenever the wind blows.
Supply meets demand
At night or on holidays, when demand is low and wind is high, there can be more power than people need.
Prices can go negative
In some markets, generators occasionally pay to keep running rather than switch off.
Why storage matters
Batteries and other storage can soak up cheap power and release it when it's scarce.
Series · Part 3 of 5Climate Basics
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