Solar Power vs. Wind Power: What's the Difference?

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Solar power converts sunlight directly into electricity in semiconductor cells, with no moving parts, while wind power uses moving air to spin turbine blades that drive an electrical generator. Solar output follows the daily cycle of the sun and is fairly predictable, whereas wind can blow day or night but varies strongly, because the power in wind rises with the cube of its speed.

At a glance

	Solar Power	Wind Power
Energy source	Sunlight	Kinetic energy of moving air
Conversion	Photovoltaic cells free electrons directly	Blades turn a generator by induction
Output type	Direct current, inverted to AC for the grid	Generated as alternating current
When it works	Daytime only; less on cloudy days	Day or night, whenever wind is strong enough
Scale and site	From one rooftop to large solar parks	Large turbines on windy land, coasts or sea

Which should you use?

Solar Power

Solar suits sunny regions and small sites, such as rooftop panels on a house or school in Rajasthan, because panels can be installed almost anywhere with direct sunlight.

Wind Power

Wind suits places with strong, steady winds, such as coastal Tamil Nadu and Gujarat or offshore sites in the North Sea, where large turbines can run day and night.

Frequently asked questions

Do solar panels work on cloudy days?

Yes, but less well. Clouds scatter and block sunlight, so panels still produce some electricity from diffuse light, but output can fall to a fraction of what they make in full sun.

Why are wind turbines so tall?

Wind is faster and steadier higher above the ground, away from friction with trees and buildings. Because power rises with the cube of wind speed, a small gain in speed gives a big gain in output.

Which produces more electricity, solar or wind?

It depends on the location. A turbine in a windy spot can run for more hours a year than a panel, which stops at night, but in very sunny regions solar can be the cheaper and larger source.