Overusing geothermal reservoirs can lead to which consequence?

• A. The supply of hot water or steam could be depleted.
• B. Increased energy production without limits
• C. Permanent heat source
• D. Cooling of the Earth's core

Answer: (A)

Overuse means extracting heat and fluids faster than the reservoir can recharge, so the underground pressure and the amount of hot water or steam available drop over time. When production outpaces natural recharge or reinjection, the reservoir becomes depleted, leading to a diminishing supply for future power generation. Sustainable operation aims to balance extraction with recharge and reinject cooled fluids to keep the field producing, but without that management the resource runs out.

This isn’t about unlimited production—geothermal reservoirs aren’t infinite, and continuous, unrestrained extraction reduces what's stored. It also isn’t about a permanent heat source; the heat within a given reservoir is finite and cooling occurs as fluids are drawn out. And pulling energy from a local geothermal field doesn’t affect the Earth's core overall.