Why is geothermal energy efficient?

Related questions

1. Is geothermal worth the expense?
2. What is EGS Centre?
3. What does HDI mean on a car?
4. Is residential geothermal worth it?
5. Why is hydropower better than other sources?
6. Is biomass a renewable energy resource Why?
7. How heat inside the earth is tapped as a source of energy?
8. Does geothermal save money?
9. What is HTR?
10. Can EGS generate energy continuously?

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