Iwate Geothermal Area

From Open Energy Information

Area Overview

Geothermal Area Profile

Location: Iwate, Japan

Exploration Region: Northeast Honshu Arc

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: 39.8586°, 140.9033°

Resource Estimate

Mean Reservoir Temp: 305°C
578.15 K
581 °F
1,040.67 °R

Estimated Reservoir Volume: 23.2 km³
23,200,000,000 m³
5.566 mi³
819,300,267,927.2 ft³
30,344,454,360.8 yd³
23,199,999,999,999.996 L

Mean Capacity: 103.5 MW
103,500 kW
103,500,000 W
103,500,000,000 mW
0.104 GW
1.035e-4 TW

USGS Mean Reservoir Temp:

USGS Estimated Reservoir Volume:

USGS Mean Capacity:

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History and Infrastructure

Operating Power Plants: 2

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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  :
  • Tohoku Hydropower
  • Geothermal Energy.Co/Tohoku Electric Power
  • Tohoku Hydropower/Geothermal Energy Co

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:

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:

Sanyal Classification (Wellhead):

Reservoir Temp (Geothermometry):

Reservoir Temp (Measured):

Sanyal Classification (Reservoir):

Depth to Top of Reservoir: 500 m
0.5 km
0.311 mi
1,640.42 ft
546.805 yd

Depth to Bottom of Reservoir: 3700 m
3.7 km
2.299 mi
12,139.108 ft
4,046.357 yd

Average Depth to Reservoir: 2100 m
2.1 km
1.305 mi
6,889.764 ft
2,296.581 yd

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Geology of the Area

Geologic Setting

Tectonic Setting: Subduction Zone

Controlling Structure:

Topographic Features: Shield Volcano

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

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

Geologic Features

Modern Geothermal Features: Hot Springs

Relict Geothermal Features: Hydrothermally Altered Rock

Volcanic Age: Quaternary

Host Rock Age: Miocene; Pre-Tertiary

Host Rock Lithology: Dacitic welded tuff; Marine Sediments Tuffs; Shales; Chert; Slate; Granodiorite

Cap Rock Age:

Cap Rock Lithology: Andesite

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Geofluid Geochemistry


Salinity (low): 853

Salinity (high): 3843

Salinity (average):

Brine Constituents:

Water Resistivity:

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NEPA-Related Analyses (0)

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.

CSV No NEPA-related documents listed.

Exploration Activities (0)

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No exploration activities listed on OpenEI.


  1. 1.0 1.1 Ruggero Bertani. 2005. World Geothermal Power Generation 2001-2005. Proceedings of World Geothermal Congress; Turkey: World Geothermal Congress.

List of existing Geothermal Resource Areas.