Renewable Energy

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Sources and types of renewable energy, from wind and solar power to hydropower and geothermal heat.

Contents

Renewable energy comes from natural processes that are replenished constantly. It is central to efforts to cut greenhouse gas emissions.

Sources

Photovoltaic panels turn sunlight directly into electricity, and costs have fallen sharply since 2010.

Turbines on land and at sea convert moving air into power.

Dams and river systems remain the largest source of renewable electricity in the world.

Wind and sunlight vary through the day and the year, so grids need flexibility, transmission lines and storage.

Batteries and pumped hydro store surplus power, which helps grids rely on variable sources such as wind and sunlight.