Hachijojima Geothermal Area

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Hachijojima Geothermal Area

Area Overview

Geothermal Area Profile

Location: Tokyo, 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: 33.103537801737°, 139.78690285547°

Resource Estimate

Mean Reservoir Temp: 283°C556.15 K
541.4 °F
1,001.07 °R

Estimated Reservoir Volume: 77 km³77,000,000,000 m³
18.473 mi³
2,719,229,337,517 ft³
100,712,197,663 yd³
77,000,000,000,000 L

Mean Capacity: 3.3 MW3,300 kW
3,300,000 W
3,300,000,000 mW
0.0033 GW
3.3e-6 TW

USGS Mean Reservoir Temp:

USGS Estimated Reservoir Volume:

USGS Mean Capacity:

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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  :
  • Tokyo Electric Power

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:
  • "b" 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:

Sanyal Classification (Wellhead):

Reservoir Temp (Geothermometry):

Reservoir Temp (Measured):

Sanyal Classification (Reservoir):

Depth to Top of Reservoir: 400m0.4 km
0.249 mi
1,312.336 ft
437.444 yd

Depth to Bottom of Reservoir: 1500m1.5 km
0.932 mi
4,921.26 ft
1,640.415 yd

Average Depth to Reservoir: 800m0.8 km
0.497 mi
2,624.672 ft
874.888 yd

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Geology of the Area

Geologic Setting

Tectonic Setting: Subduction Zone

Controlling Structure:

Topographic Features: Caldera Depression

Brophy Model: Type B: Andesitic Volcanic Resource

Moeck-Beardsmore Play Type: CV-1a: Magmatic - Extrusive

Geologic Features

Modern Geothermal Features:

Relict Geothermal Features:

Volcanic Age:

Host Rock Age:

Host Rock Lithology:

Cap Rock Age:

Cap Rock Lithology:

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Geofluid Geochemistry


Salinity (low): 28000

Salinity (high):

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)

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

No exploration activities listed on OpenEI.


  1. Henry J. Ramey, Jr., Roland N. Horne, Paul Kruger, Frank G. Miller, William E. Brigham, Jean W. Cook. 1993. Proceedings- 18th workshop geothermal reservoir engineering. Stanford, CA: 18th Workshop Geothermal Reservoir Engineering. Report No.: SGP- TR-145.
  2. 2.0 2.1 Ruggero Bertani. 2005. World Geothermal Power Generation 2001-2005. Proceedings of World Geothermal Congress; Turkey: World Geothermal Congress.

List of existing Geothermal Resource Areas.

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