Brady Hot Springs Geothermal Area

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Brady Hot Springs Geothermal Area

Area Overview

Geothermal Area Profile

Location: Nevada

Exploration Region: Northwest Basin and Range Geothermal Region

GEA Development Phase: Operational"Operational" is not in the list of possible values (Phase I - Resource Procurement and Identification, Phase II - Resource Exploration and Confirmation, Phase III - Permitting and Initial Development, Phase IV - Resource Production and Power Plant Construction) for this property.

Coordinates: 39.7883°, -119.0167°

Resource Estimate

Mean Reservoir Temp: 182°C455.15 K
359.6 °F
819.27 °R

Estimated Reservoir Volume: 3.17 km³3,170,000,000 m³
0.761 mi³
111,947,493,505.57 ft³
4,146,203,462.23 yd³
3,170,000,000,000 L

Mean Capacity: 26.1 MW26,100 kW
26,100,000 W
26,100,000,000 mW
0.0261 GW
2.61e-5 TW

USGS Mean Reservoir Temp: 185°C458.15 K
365 °F
824.67 °R

USGS Estimated Reservoir Volume: 4 km³ [4]

USGS Mean Capacity: 44 MW [4]

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History and Infrastructure

Operating Power Plants: 1

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Developing Power Projects: 0

No geothermal projects listed.

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Power Production Profile

Gross Production Capacity:

Net Production Capacity:

Owners  :
  • Ormat

Power Purchasers :

Other Uses:

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Regulatory and Environmental Issues

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Exploration History

First Discovery Well

Completion Date:

Well Name:



Initial Flow Rate:
  • "db" is not declared as a valid unit of measurement for this property.
  • The given value was not understood.

Flow Test Comment:

Initial Temperature:

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Well Field Description

Well Field Information

Development Area:

Number of Production Wells:

Number of Injection Wells:

Number of Replacement Wells:

Average Temperature of Geofluid: 187 °C460.15 K
368.6 °F
828.27 °R

Sanyal Classification (Wellhead): Low Temperature

Reservoir Temp (Geothermometry):

Reservoir Temp (Measured):

Sanyal Classification (Reservoir):

Depth to Top of Reservoir: 300 m0.3 km
0.186 mi
984.252 ft
328.083 yd

Depth to Bottom of Reservoir: 1676 m1.676 km
1.041 mi
5,498.688 ft
1,832.89 yd

Average Depth to Reservoir: 988 m0.988 km
0.614 mi
3,241.47 ft
1,080.487 yd

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Geology of the Area

Geologic Setting

Tectonic Setting: Extensional Tectonics

Controlling Structure: Accommodation Zone [6]

Topographic Features: Horst and Graben

Brophy Model: Type E: Extensional Tectonic, Fault-Controlled Resource

Moeck-Beardsmore Play Type: CV-3: Extensional Domain

Geologic Features

Modern Geothermal Features: Fumaroles, Mudpots, Mud Pools, or Mud Volcanoes [5]

Relict Geothermal Features: Hydrothermal Deposition [5]

Volcanic Age: No volcanism

Host Rock Age: Mesozoic [7]

Host Rock Lithology: metamorphic rocks [7]

Cap Rock Age: Tertiary [7]

Cap Rock Lithology: Hydrothermally altered volcanics [7]

The Brady’s geothermal field, in the hot spring mountains of northwestern Nevada, has a reservoir temperature of 180-193°C at 1- 2 km depth and supports a combined dual flash and binary geothermal power plant with a total installed capacity of 26 MWe. The Brady’s area is dominated by NNE-trending gently to moderately tilted fault blocks bounded by moderately to steeply dipping normal faults. Faults in the area dip both WNW and ESE and have respectively accommodated both E- and W-tilting of fault blocks. West-tilted fault blocks predominate suggesting that ESE-dipping faults have accommodated the bulk of extension in the area. No major transverse or cross faults have been observed at the surface. In terms of hydrothermal activity, the most significant fault in the area is the Brady’s fault zone, which consists of a complex system of en echelon, primarily WNW-dipping faults. The surface expression of the Brady’s geothermal system is a 4-km-long, NNE-trending zone of extensive sinter, warm ground, fumaroles, and mud pots along the Brady’s fault system. The main hot springs at Brady’s have been the site of a resort and spa for many years (1930s to 1950s). The main production wells at Brady’s appear to penetrate the down-plunge projection of a small left step in a major splay of the Brady’s fault zone. The NNE-striking Brady’s fault zone is orthogonal to the regional WNW-trending extension direction and is thus favorably oriented for fluid flow. We suggest that multiple fault intersections at depth between the WNW-dipping Brady’s fault zone and presumably older ESE-dipping faults, as well as multiple fault strands in the step-over, produce a zone of high fracture density that enhances fluid flow and facilitates the rise of a deep-seated thermal plume.[5]

Geofluid Geochemistry


Salinity (low): 3500 [8]

Salinity (high):

Salinity (average): 3500

Brine Constituents:

Water Resistivity:

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NEPA-Related Analyses (3)

Below is a list of NEPA-related analyses that have been conducted in the area - and logged on OpenEI. To add an additional NEPA-related analysis, see the NEPA Database.


Document # Analysis
Applicant Application
DOI-BLM-NV-W010-2010-0041-CX CX Stephen D. Muir 2 April 2010 26 July 2010 Bureau of Land Management Geothermal/Exploration Seismic Techniques
DOI-BLM-NV-W010-2012-0057-EA EA Brady Power Partners 5 January 2012 17 January 2013 Bureau of Land Management Geothermal/Well Field Downhole Techniques
NVN-88321 CU Stephen G. Muir 2 April 2010 13 April 2010 BLM Geothermal/Exploration Microgravity-Hybrid Microgravity

Exploration Activities (1)

Below is a list of Exploration that have been conducted in the area - and cataloged on OpenEI. Add.png Add a new Exploration Activity

Page Technique Activity Start Date Activity End Date Reference Material
Micro-Earthquake At Brady Hot Springs Geothermal Area (2011) Micro-Earthquake 2011 2011


  1. 1.0 1.1 1.2 Ruggero Bertani. 2005. World Geothermal Power Generation 2001-2005. Proceedings of World Geothermal Congress; Turkey: World Geothermal Congress.
  2. Geothermex Inc.. 2004. New Geothermal Site Identification and Qualification. Richmond, CA: California Energy Commission. Report No.: P500-04-051. Contract No.: 500-04-051.
  3. Benjamin Matek. Geo-energy [Internet]. Geothermal Energy Association. [updated 2015/04/28;cited 2015/04/28]. Available from:
  4. 4.0 4.1 4.2 U.S. Geological Survey. 2008. Assessment of Moderate- and High-Temperature Geothermal Resources of the United States. USA: U.S. Geological Survey. Report No.: Fact Sheet 2008-3082.
  5. 5.0 5.1 5.2 5.3
  7. 7.0 7.1 7.2 7.3

List of existing Geothermal Resource Areas.

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