geothermal deposit
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GC: n

CT: With respect to dwellings, a renewable energy system means a system that, when installed in connection with a dwelling, transmits or uses solar energy, energy derived from the geothermal deposits, energy derived from biomass, or any other form of renewable energy that the Secretary of Energy specifies by regulations, for the purpose of heating or cooling the dwelling or providing hot water or electricity for use within the dwelling, or wind energy used for non-business residential purposes.

S: USL – http://energylaw.uslegal.com (last access: 5 December 2014)

N: 1. geothermal (adj): 1875, from geo– (word-forming element meaning “earth,” ultimately from Greek geo-, comb. form of ge “earth”) + thermal (1756, “having to do with hot springs,” from French thermal (Buffon), from Greek therme “heat, feverish heat,” from PIE gwher- “to heat, warm” -cognates: Latin fornax “an oven, kiln,” formus “warm,” Old English wearm-. Sense of “having to do with heat” is first recorded 1837. The noun meaning “rising current of relatively warm air” is recorded from 1933).
deposit (n): 1620s, from Latin depositum, from deponere (to deposit). Geological sense is from 1781; monetary sense is from 1737.
2. Steam or hot water deposits exist in relatively shallow depths within the Earth’s crust and can be used directly or by boreholes; the state of engineering allows the conversion into electric power or for a domestic and agricultural utilization.
3. Field that is not in production.
4. The maintenance of water pressure in a geothermal deposit requires the water injection: it is intended to exploit the heat and not the water.

S: 1. OED – http://www.etymonline.com/index.php?term=geothermal (last access: 30 August 2014); http://www.etymonline.com/index.php?allowed_in_frame=0&search=deposit&searchmode=none (last access: 2 December 2014). 2, 3 & 4. GDT.

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CR: aerothermal energy, geothermal energy, geothermics.