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LegalText 42 U.S.C. § 17191 Definitions us united_states_code code_section 42 THE PUBLIC HEALTH AND WELFARE 152 ENERGY INDEPENDENCE AND SECURITY 17191 42 U.S.C. § 17191 current 119-100 2026-06-26 official https://uscode.house.gov/download/releasepoints/us/pl/119/100/xml_usc42@119-100.zip /us/usc/t42/s17191 data/legal/raw/us/code/title-42/usc42.xml e3e1181a3cbe680ae410230bc879286f81b857b389db2bfdf8ed5a5efd6d47c3 644321055a08eb1f260a6a3e31ac157fa024756abf612a9fd6857e7e400cf24e fe87ccf2e151fb0bf99a419393d9f8ecaf9117f0a213320affa7c314fbbbe31f 2026-07-04 official
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42 U.S.C. § 17191 - Definitions

Text

For purposes of this part:

(1) Engineered When referring to enhanced geothermal systems, the term “engineered” means designed to access subsurface heat, including stimulation and nonstimulation technologies to address one or more of the following issues:

(A) Lack of effective permeability, porosity or open fracture connectivity within the heat reservoir.

(B) Insufficient contained geofluid in the heat reservoir.

(C) A low average geothermal gradient which necessitates deeper drilling, or the use of alternative heat sources or heat generation processes.

(2) Eligible entity The term “eligible entity” means any of the following entities:

(A) An institution of higher education.

(B) A National laboratory.

(C) A Federal research agency.

(D) A State research agency.

(E) A nonprofit research organization.

(F) An industrial entity.

(G) A consortium of 2 or more entities described in subparagraphs (A) through (F).

(3) Enhanced geothermal systems The term “enhanced geothermal systems” means geothermal reservoir systems that are engineered, as opposed to occurring naturally.

(4) Geofluid The term “geofluid” means any fluid used to extract thermal energy from the Earth which is transported to the surface for direct use or electric power generation, except that such term shall not include oil or natural gas.

(5) Geopressured resources The term “geopressured resources” mean geothermal deposits found in sedimentary rocks under higher than normal pressure and saturated with gas or methane.

(6) Geothermal The term “geothermal” refers to heat energy stored in the Earths crust that can be accessed for direct use or electric power generation.

(7) Hydrothermal The term “hydrothermal” refers to naturally occurring subsurface reservoirs of hot water or steam.

(8) Systems approach The term “systems approach” means an approach to solving problems or designing systems that attempts to optimize the performance of the overall system, rather than a particular component of the system.

(Pub. L. 110140, title VI, § 612, Dec. 19, 2007, 121 Stat. 1679; Pub. L. 116260, div. Z, title III, § 3002(a), Dec. 27, 2020, 134 Stat. 2487.)

Notes

Editorial Notes

Amendments2020—Par. (1). Pub. L. 116260, § 3002(a), amended par. (1) generally. Prior to amendment, par. (1) defined the term “engineered”. Pars. (2) to (8). Pub. L. 116260, § 3002(a)(2), (3), added par. (2) and redesignated former pars. (2) to (7) as (3) to (8), respectively.

Statutory Notes and Related Subsidiaries

Effective DateSection effective on the date that is 1 day after Dec. 19, 2007, see section 1601 of Pub. L. 110140, set out as a note under section 1824 of Title 2, The Congress.

Short TitleThis part known as the “Advanced Geothermal Energy Research and Development Act of 2007”, see Short Title note set out under section 17001 of this title.