Geothermal Energy Production and Sustainability

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Questions and Answers

Which of the following methods is NOT one of the ways geothermal energy reaches the Earth's surface?

  • Hot springs
  • Geysers
  • Volcanoes and fumaroles
  • Tsunamis (correct)

What is the primary purpose of the cooling tower in a geothermal power plant?

  • To convert electricity into steam
  • To cool the steam and condense it back into water (correct)
  • To extract more geothermal fluids
  • To spin the turbine more efficiently

Which of the following is a factor that influences natural depletion in geothermal fields?

  • Over extraction
  • Reservoir cooling (correct)
  • Poor well design
  • Inadequate reservoir management

What disadvantage is primarily associated with geothermal energy?

<p>High upfront costs to build plants (B)</p> Signup and view all the answers

Which of the following is NOT an example of a depleted geothermal field?

<p>Yosemite, USA (B)</p> Signup and view all the answers

Which step in the geothermal electricity generation process occurs after the steam spins the turbine?

<p>The generator produces electricity (A)</p> Signup and view all the answers

What type of energy resource is geothermal energy classified as?

<p>Renewable energy source (C)</p> Signup and view all the answers

Which of the following options represents a human-induced factor that can lead to depletion of geothermal fields?

<p>Lack of reinjection (D)</p> Signup and view all the answers

How deep are wells typically drilled to access geothermal energy?

<p>3-10 kilometers (A)</p> Signup and view all the answers

Which advantage of geothermal energy is highlighted as being different from solar or wind energy?

<p>Consistent energy supply (D)</p> Signup and view all the answers

What is a potential consequence of extracting geothermal fluids from high-pressure reservoirs?

<p>Ground subsidence (D)</p> Signup and view all the answers

Which chemical substance is NOT commonly found in geothermal fluids?

<p>Sodium (D)</p> Signup and view all the answers

What practice can help mitigate the risk of damaging geothermal features?

<p>Reinjecting spent fluids (D)</p> Signup and view all the answers

What is a recommended distance consideration for reinjection sites in geothermal energy practices?

<p>Far from extraction sites to prevent immediate reuse (B)</p> Signup and view all the answers

Which hazard is associated with the intersection of drilling geothermal wells and geological faults?

<p>Enhanced seismic activity (D)</p> Signup and view all the answers

What negative effect can result from the release of geothermal fluids into waterways?

<p>Harm to aquatic life (D)</p> Signup and view all the answers

What approach does NOT contribute to the conservation of geothermal resources?

<p>Increasing extraction volumes (A)</p> Signup and view all the answers

What impact can geothermal development have on natural geothermal features?

<p>Destruction of hot springs (B)</p> Signup and view all the answers

Which of the following is a characteristic of subsurface hazards related to geothermal energy?

<p>Potential for new fractures in rock (D)</p> Signup and view all the answers

What occurs if extraction of geothermal resources leads to over-production?

<p>Cooling of the geothermal reservoir (D)</p> Signup and view all the answers

Flashcards

What is Geothermal Energy?

The heat energy generated from the Earth's core, accessible through volcanic activity, hot springs, and geysers.

How does Geothermal Energy work?

Geothermal power plants harness the heat from the Earth's core to generate electricity. This involves drilling deep wells to extract steam or hot water, which then drives turbines connected to generators.

Where does Geothermal Energy come from?

Volcanoes, fumaroles (vents releasing steam and gases), hot springs, and geysers are natural outlets for the Earth's internal heat, making them ideal locations for geothermal energy extraction.

How are Geothermal Power Plants used?

Geothermal power plants are designed to convert the Earth's heat into electricity. They use steam or hot water extracted from deep wells to spin turbines, which drive generators to produce electricity.

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What are the risks of Geothermal Energy extraction?

Over-extraction of geothermal resources without proper management can lead to depletion, affecting the flow of steam or hot water, ultimately reducing energy output.

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What is Reservoir Cooling?

Cooling of the geothermal reservoir, where the hot water or steam is stored, can occur due to excessive extraction, leading to reduced energy production.

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What is Reinjection in Geothermal energy?

The process of reinjecting cooled water back into the geothermal reservoir helps replenish the hot water supply, ensuring long-term sustainability of the energy source.

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What are the Environmental Advantages of Geothermal Energy?

The use of geothermal energy has minimal impact on the environment compared to fossil fuels. It is a clean, renewable source of energy that reduces greenhouse gas emissions.

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What are the Disadvantages of Geothermal Energy?

High upfront costs for building geothermal power plants and the limited availability of suitable geothermal resources in all locations are major drawbacks.

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What are the Potential Environmental Risks of Geothermal Energy?

Although not a common occurrence, some potential risks associated with geothermal energy include induced seismic activity (earthquakes) and the possibility of groundwater contamination.

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Earthquakes and Geothermal Energy

Drilling for geothermal energy can create new cracks in the earth, which could increase the risk of earthquakes.

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Ground Subsidence

Removing hot water from underground can cause the ground to sink, like a deflated balloon.

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Chemical Contamination from Geothermal Energy

Geothermal fluids can contain harmful chemicals like heavy metals and toxic substances that can contaminate the environment.

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Damage to Geothermal Features

Geothermal development can damage natural features like geysers, hot springs, and steam vents.

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Waterways Pollution from Geothermal Energy

Geothermal fluids can contain high levels of pollutants like mercury, boron, and arsenic, which can harm aquatic life and make water unsafe for drinking.

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Sustainable Geothermal Energy Usage

Even though geothermal energy is renewable, it's important to use it sustainably to avoid depleting the underground reservoir.

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Over-Production of Geothermal Resources

To help conserve geothermal resources, it's crucial to avoid extracting more hot water than the reservoir can replenish.

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Reinjection of Spent Geothermal Fluids

Reinjecting used geothermal fluids back into the reservoir helps to maintain pressure and prevent ground subsidence.

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Distance between Extraction and Reinjection Sites

Placing the reinjection site far from the extraction site allows the injected water to be adequately heated before being extracted again.

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Sustainability in Geothermal Energy

Sustainable geothermal energy extraction involves using it responsibly and efficiently to make sure there is enough for the future.

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Study Notes

Geothermal Energy: Production and Sustainability

  • Geothermal energy harnesses Earth's internal heat for energy production.
  • It reaches the surface through various pathways like volcanoes, fumaroles, hot springs, and geysers.
  • Electricity generation involves steam produced from geothermal heat spinning turbines connected to generators.
  • Power plant steps: Wells drill into the ground (3-10 km), hot water/steam pumped to the surface, pressure drop causes water to steam, steam spins turbines producing electricity, cooled steam is condensed back to water, cooled water is reinjected to continue the process.

Geothermal Energy Advantages and Disadvantages

  • Advantages:

    • Renewable: Earth's heat is constantly replenished.
    • Clean: Lower greenhouse gas emissions than fossil fuels.
    • Reliable: Consistent energy supply.
    • Versatile: Used for electricity, heating, and cooling..
  • Disadvantages:

    • Location-specific: Only found in specific geological areas.
    • Expensive: High initial plant construction costs.
    • Environmental risks: Potential earthquakes, water contamination.

Geothermal Energy Resource Depletion and Management

  • Natural Depletion: Reservoir cooling & fluid depletion occur naturally.
  • Human-induced Depletion: Over-extraction, inadequate reservoir management, poor well design, and lack of reinjection.
  • Examples of Depleted Geothermal Fields: Geysers (California), Larderello (Italy), Wairakei (New Zealand), Tiwi (Philippines) (Visual aids exist).

Geothermal Energy Threats and Risks

  • Subsurface Hazards:
    • Earthquakes: Drilling can trigger new faults and increase earthquake risk.
    • Ground Subsidence: Pressure drop in geothermal reservoirs leads to ground sinking.
  • Environmental Impacts:
    • Chemical Contamination: Geothermal fluids can contain hazardous chemicals.
    • Damage to Geothermal Features: Development can harm geysers, hot springs, and fumaroles.
    • Waterways Pollution: Potential contamination of water sources with heavy metals.

Geothermal Energy Conservation

  • Prevent Overproduction: Avoid excessive hot water extraction, cooling the reservoir,
  • Reinjection: Return spent fluids to the reservoir as much as possible.
  • Reinjection Site Placement: Ideally, the re-injection site should be distanced from the extraction site to allow proper heating of the injected water.

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