Discover the many uses of geothermal energy. From powering cities to heating greenhouses, learn how we put Earth's heat to work in everyday life.
Geothermal energy has many uses. It can generate electricity. It can heat and cool buildings. It can warm greenhouses and fish farms. It can power industrial processes.
The same resource serves many purposes. The key is matching the temperature to the need. High temperatures make electricity. Low temperatures heat buildings.
This is the most famous use of geothermal energy.
Power plants use heat from underground to make electricity. The heat turns water into steam. The steam spins turbines. The turbines drive generators.
Globally, geothermal plants produce about 16 gigawatts of electricity. That is enough for about 16 million homes.
The United States leads the world in geothermal electricity. Indonesia, the Philippines, Turkey, and New Zealand are also major producers.
Electricity generation needs high temperatures. Typically above 150 degrees Celsius. That is why these plants are in volcanic areas.
Heat pumps are the most common use of geothermal energy.
They use the constant shallow ground temperature. Just 10 feet down, the ground stays at 50 to 60 degrees Fahrenheit all year.
In winter, the heat pump pulls heat from the ground into the building. In summer, it pulls heat from the building into the ground.
More than a million geothermal heat pumps are installed in the United States. Schools, offices, and homes use them. They cut heating and cooling costs by 30 to 60 percent.
Heat pumps are 300 to 400 percent efficient. For every unit of electricity they use, they move three to four units of heat.
Here are the ways we use geothermal energy.
To make electricity. Steam from underground spins a big fan. The fan makes electricity for lights and TVs.
To warm houses. Hot water from underground goes through pipes into buildings. It keeps people warm in winter.
To help farmers. Some farmers use warm water to heat greenhouses. Plants stay cozy even when it snows.
To grow fish. Fish farms use warm water to help fish grow faster.
To melt snow. In some places, warm pipes under sidewalks melt snow and ice.
Geothermal energy is useful in many ways. It helps people stay warm, grow food, and power their homes.
Here are the industrial and agricultural uses.
Greenhouses. Geothermal water keeps greenhouses warm in winter. Hungary uses about 80 percent of its geothermal energy for agriculture. Greenhouses grow tomatoes, peppers, and flowers year round.
Fish farming. Warm water speeds up fish growth. New Zealand has a prawn farm heated by geothermal wastewater. Catfish, tilapia, and shrimp are also farmed with geothermal heat.
Food processing. Geothermal heat dries fruits and vegetables. It pasteurizes milk. It sterilizes equipment.
Lumber drying. In New Zealand, geothermal steam dries timber. The steam passes through heat exchangers to heat kiln air to 140 degrees Celsius.
Gold mining. Geothermal heat helps extract gold from ore.
Milk pasteurization. Steady geothermal heat pasteurizes milk efficiently.
Sometimes you do not need electricity. You just need heat.
Direct use systems pipe hot geothermal water straight into buildings. This is much more efficient than making electricity and then using it for heat.
Direct use saves about 70 percent of the energy compared to electric heaters.
District heating is a large scale direct use. Hot water from a geothermal source is piped to many buildings. Reykjavik, Iceland has one of the largest district heating systems. It heats 95 percent of the city’s buildings.
Paris has used geothermal district heating since the 1960s. It heats about 200,000 homes. Boise, Idaho has a system dating back to 1893.
Factories use geothermal heat for many processes.
Dehydration. Drying fruits and vegetables is the most common industrial use.
Pasteurization. Heating milk to kill bacteria.
Sterilization. Cleaning equipment with steam.
Pulp and paper. Heating kilns for drying wood products.
Chemical extraction. Processing minerals and chemicals.
These applications need steady, reliable heat. Geothermal provides exactly that.
Hot springs are the oldest use of geothermal energy.
People visit geothermal spas for relaxation and health. The Blue Lagoon in Iceland is one of the most famous. It attracts thousands of visitors each year.
Japan has thousands of onsens, traditional hot spring baths. They are a central part of Japanese culture and tourism.
Many countries have developed geothermal spas and resorts. They combine natural hot springs with modern amenities.
The many uses of geothermal energy show its versatility. Ask students to think about which use is most important in their lives. Would they rather have geothermal electricity, heating, or hot springs?
Have students research how their own community could use geothermal energy. Could heat pumps work in their homes? Is there potential for district heating? This makes the topic personal.
Last updated: July 06, 2026
1. What are the three main uses of geothermal energy?
2. What is district heating?
3. Which country uses the most geothermal energy for district heating?
4. What is a direct use of geothermal energy?
5. How efficient are geothermal heat pumps?
What are the main uses of geothermal energy?
The three main uses are generating electricity, heating and cooling buildings with heat pumps, and direct uses like heating greenhouses, fish farms, and industrial processes.
How is geothermal energy used to make electricity?
Geothermal power plants use steam from underground to spin turbines. The turbines turn generators that produce electricity. There are three types of plants: dry steam, flash steam, and binary cycle.
How is geothermal energy used directly for heating?
Hot water from underground is piped directly into buildings, greenhouses, or industrial facilities. This is called direct use. It is more efficient than converting heat to electricity first.
What is district heating?
District heating is a system where hot water from a geothermal source is piped to many buildings through insulated pipes. Reykjavik, Iceland has one of the world's largest systems.
How is geothermal energy used in agriculture?
Farmers use geothermal water to heat greenhouses in cold climates. Fish farms use warm water to speed up fish growth. Some farms use it to dry crops.
