Renewable Power Falls Short Most of the Time

In a recent study, researchers used random‑variable models to check how often these green sources match demand.

The results were surprising:

• Solar panels cover only about a third of the yearly need.
• Wind turbines satisfy less than half.

When homes turn on heaters or air conditioners, the problem grows worse.
The wind and sun rarely line up with those peak moments, leaving a gap that must be filled by other plants.

Adding more wind and sun to the grid can actually backfire.
Higher reliance on renewables forces a greater use of fossil‑fuel plants or can trigger power cuts, and it also pushes up the price that households pay for electricity.

Even though, in theory, solar could meet a person’s yearly use if the sun shone all the time, its real‑world variability means it often fails to keep the lights on.

The study found that a system powered only by solar meets demand in just about one out of every three snapshots, and it still produces excess power that must be wasted.

Overall, the combined failure rate of about 62 % shows that wind and solar alone are not reliable enough to replace traditional power sources in Greece.