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Table 1 Level of sustainability in dependence of extraction/recharge ratio

From: Sustainable operation of geothermal power plants: why economics matters

Level of sustainability Extraction/recharge ratio Operation time (relative values)
Truly sustainable E ≤ Re Infinite
Sustainable manner E ≤ E0 with E > Re 100 to 300 years
Unsustainable E > E0 with E >> Re Few decades (< 100 years)