Zunil Geothermal Area

From Open Energy Information

Area Overview

Geothermal Area Profile

Location: Guatemala

Exploration Region: Central American Volcanic Arc Chain

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: 14.7742°, -91.5064°

Resource Estimate

Mean Reservoir Temp: 259°C
532.15 K
498.2 °F
957.87 °R

Estimated Reservoir Volume: 2.7 km³
2,700,000,000 m³
0.648 mi³
95,349,600,146.7 ft³
3,531,466,671.3 yd³
2,700,000,000,000 L

Mean Capacity: 28 MW
28,000 kW
28,000,000 W
28,000,000,000 mW
0.028 GW
2.8e-5 TW

USGS Mean Reservoir Temp:

USGS Estimated Reservoir Volume:

USGS Mean Capacity:

Use the "Edit With Form" menu option to add content

History and Infrastructure

Operating Power Plants: 1

Add a new Operating Power Plant

Developing Power Projects: 0

No geothermal projects listed.

Add a new Developing Power Project

Power Production Profile

Gross Production Capacity: 24 MW
24,000 kW
24,000,000 W
24,000,000,000 mW
0.024 GW
2.4e-5 TW

Net Production Capacity:

Owners  :
  • Ormat

Power Purchasers :
  • Instituto Nacional de Electrificacion

Other Uses:

Use the "Edit With Form" menu option to add content

Regulatory and Environmental Issues

Use the "Edit With Form" menu option to add content

Exploration History

First Discovery Well

Completion Date:

Well Name:



Initial Flow Rate:

Flow Test Comment:

Initial Temperature:

Use the "Edit With Form" menu option to add content

Well Field Description

Well Field Information

Development Area:

Number of Production Wells: 7

Number of Injection Wells: 4

Number of Replacement Wells:

Average Temperature of Geofluid: 270°C
543.15 K
518 °F
977.67 °R

Sanyal Classification (Wellhead):

Reservoir Temp (Geothermometry):

Reservoir Temp (Measured):

Sanyal Classification (Reservoir):

Depth to Top of Reservoir: 700 m
0.7 km
0.435 mi
2,296.588 ft
765.527 yd

Depth to Bottom of Reservoir: 1600 m
1.6 km
0.994 mi
5,249.344 ft
1,749.776 yd

Average Depth to Reservoir:

Use the "Edit with Form" button at the top of the page to add a Well Field Description

Geology of the Area

Geologic Setting

Tectonic Setting: Subduction Zone

Controlling Structure:

Topographic Features:

Brophy Model: Type C: Caldera Resource

Moeck-Beardsmore Play Type: CV-1a: Magmatic - Extrusive, CV-1b: Magmatic - Intrusive
"CV-1a: Magmatic - Extrusive, CV-1b: Magmatic - Intrusive" is not in the list of possible values (CV-1a: Magmatic - Extrusive, CV-1b: Magmatic - Intrusive, CV-2a: Plutonic - Recent or Active Volcanism, CV-2b: Plutonic - Inactive Volcanism, CV-3: Extensional Domain, CD-1: Intracratonic Basin, CD-2: Orogenic Belt, CD-3: Crystalline Rock - Basement) for this property.

Geologic Features

Modern Geothermal Features: Fumaroles, Hot Springs

Relict Geothermal Features:

Volcanic Age: Recent

Host Rock Age:

Host Rock Lithology: Granite; Volcanics

Cap Rock Age:

Cap Rock Lithology:

Use the "Edit With Form" menu option to add content

Geofluid Geochemistry


Salinity (low):

Salinity (high):

Salinity (average):

Brine Constituents: High chloride [4]

Water Resistivity:

Use the "Edit With Form" menu option to add content

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. John H. Altseimer, Frederick J. Edeskuty. 08/1988. A survey of geothermal process heat applications in Guatemala: An Engineering Survey. Los Alamos National Laboratory. Los Alamos National Laboratory. 1-86p.
  2. Ruggero Bertani. 2005. World Geothermal Power Generation 2001-2005. Proceedings of World Geothermal Congress; Turkey: World Geothermal Congress.
  3. 3.0 3.1 Francisco Asturias. 2003. Reservoir assessment of Zunil 1 & 2 geothermal fields, Guatemala. In: Geothermal Training Program; 2003/04/01; Reykjavik, Iceland. Reykjavik, Iceland: Geothermal Training Program; p. 1-32
  4. The Zunil-II Geothermal Field, Guatemala, Central America

List of existing Geothermal Resource Areas.