Geothermal plant steam

Steam rising from geothermal plants shows how Earth's heat generates clean, renewable energy in various parts of the world.

About this subject

Geothermal energy harnesses heat from the Earth's interior to generate electricity. Geothermal plants drill deep wells to access reservoirs of heated water or steam, which is then directed to turbines connected to generators. This process is continuous and independent of weather conditions, unlike solar or wind power.

The largest geothermal energy producers are the United States, Indonesia, the Philippines, and Iceland. In Iceland, about 25% of electricity comes from geothermal sources, and heat is used directly for district heating. In Brazil, geothermal potential is limited, but studies are underway for use in regions like the Northeast, especially deep aquifers.

Technology can be binary cycle for lower temperatures or dry steam for high temperatures. Environmental impacts are low, with reduced CO₂ emissions compared to fossil fuels. However, there are risks of subsidence and release of dissolved gases. Still, geothermal energy is considered a reliable, low-carbon source.

Frequently Asked Questions

How does a geothermal plant work?

Geothermal plants drill wells to access hot water or steam underground. The steam spins turbines to generate electricity, and the water is reinjected to sustain the reservoir.

Are there geothermal plants in Brazil?

Brazil does not have large-scale geothermal plants, but there are pilot projects and studies in the Northeast, such as in Rio Grande do Norte and Bahia, to utilize deep aquifers.

Is geothermal energy truly clean?

Yes, it emits much less CO₂ than fossil fuels. However, it can release gases like hydrogen sulfide and requires careful management to avoid local impacts.