Sciencecalendar_todayLast updated: Apr 2026
What is Renewable Energy?
/rɪˈnjuːəbəl ˈɛnədʒi/
Renewable energy comes from naturally replenishing sources — solar, wind, hydro, geothermal, tidal — that are not depleted when used, unlike fossil fuels which take millions of years to form.
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Everyday Example
A solar panel on your roof converts sunlight into electricity without consuming the sun. A wind turbine uses moving air without reducing the wind available.
publicReal-World Application
“In 2023 the UK generated over 50% of its electricity from renewable sources for the first time. Solar panel costs have fallen 99% since 1977, making renewables cheaper than new coal in most countries.”
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Did you know?
The first wind turbine generating electricity was built in 1887 in Scotland by James Blyth. Solar cells were invented in 1954 at Bell Labs.
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Key Insight
The challenge with renewables is not generation cost — it is intermittency. The sun does not always shine and the wind does not always blow, requiring storage and grid solutions.
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