Phase II - Resource Exploration and Confirmation

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GEA Development Phase II: Resource Exploration and Confirmation

GEA Development Phases

The Geothermal Energy Association’s (GEA) Geothermal Reporting Terms and Definitions are a guideline for geothermal developers to use when submitting geothermal resource development information to GEA for public dissemination in its annual US Geothermal Power Production and Development Update. GEA’s Geothermal Reporting Terms and Definitions serve to increase the consistency, accuracy, and reliability of industry information presented in the development updates.


The information for this page was taken directly from Geothermal Reporting Terms and Definitions: A Guide to Reporting Resource Development Progress and Results to the Geothermal Energy Association (GEA, November 2010)


Phase II Criteria

In reporting a Phase II geothermal project to the GEA the developer must ascertain whether or not the project being reported meets the following specified criteria. The development criteria are divided into three different subsections of Phase II geothermal development (Resource, Transmission, and External Development). It is not necessary that a geothermal project meet all of the criteria listed. The number of criteria that a project must meet in each subsection of geothermal Phase II development is specified below.

1. Resource Development Criteria

For a project to be considered a Phase II project at least one of the following Resource Development criteria must be met:

  • Temperature Gradient Holes (TGH) Drilled
A sufficient number of TGH holes have been drilled which measure temperature gradients that indicate a potential geothermal resource over a large enough thermal anomaly to justify further drilling.
  • Slim Hole Drilled
At least one 3” or greater diameter slim hole drilled to a depth that penetrates a portion of the geothermal reservoir.
  • One Full Size Discovery Well Drilled
One full sized well completed with bottom-hole temperatures and flow rates sufficient for a commercial size geothermal well (typically 3 to 5 MW) capable of simple payback given existing economic conditions and commercial terms for selling power.


2. Transmission Development Criteria

For a project to be considered a Phase II project at least one of the following Transmission Development criteria must be met.

  • Interconnection application submitted and queue position established
Application to construct necessary transmission lines from the geothermal resource development project to the grid have been submitted to the utility for which the project will interconnect.
  • Transmission feasibility studies underway
The developer has begun the analysis of necessary steps that must be taken to connect its project to an identified utilities transmission system.


3. External to Resource Development Criteria

For a project to be considered a Phase II project at least one of the following External to Resource Development criteria must be met:

  • Permit for Slim Hole Drilling Applied for or Approved
The developer must have obtained a permit for the drilling of a slim hole to a depth that penetrates a portion of the geothermal reservoir.
  • Permit for Production Well Drilling Applied for or Approved
The developer must have obtained, or submitted an application for, a permit for the drilling of a full size production well from the appropriate state agency.


Phase II Terms & Definitions

The following terms and their definitions are to be applied to geothermal projects which are in the Phase II stage of geothermal development.

  • Possible Resource Estimate
For a geothermal project to be considered a Phase II Possible Resource it must exhibit known characteristics which lead the developer to believe, with a level of confidence appropriate to the stage of development, that further development of the geothermal project may lead to potential economic utilization of the resource.

Specifically, as mentioned above, the developer of a geothermal project must fulfill one of the criteria listed in the Phase II Resource Development Category, one of the criteria listed in the Phase II Transmission

Development Category, and one of the criteria listed in the Phase II External Development Category.

It should be noted that the Possible Resource Estimate should not be used as a value to indicate the potential installed capacity of a geothermal power plant. Rather, it is the estimated value of the subsurface geothermal resource.

  • Possible Planned Capacity Addition (PCA) Estimate
The Phase II Possible Planned Capacity Addition (PCA) estimate is that portion of a Possible Resource that the developer deems to be viable for the economic production of electricity under existing economic conditions. Also, the PCA estimate should represent the potential capacity that is currently controlled by the developer, and not the total capacity that the developer intends to control and produce in the future. In other words, if the developer were to utilize the geothermal resource under its control to produce electricity via a geothermal power plant the Phase II PCA estimate would be the power plants estimated installed capacity. If the developer were expanding a currently operating plant the Phase II Possible PCA estimate would be the estimated capacity to be added to the plants current installed capacity.


Phase II - Projects

Technique
Developer

Project
Type
Capacity
Estimate
(MW)

Location

Geothermal
Area

Geothermal
Region
GEA
Report
Date
Akutan Geothermal ProjectCity Of AkutanHydrothermal Systems10 MW
10,000 kW
10,000,000 W
10,000,000,000 mW
0.01 GW
1.0e-5 TW
Akutan, AKAkutan Fumaroles Geothermal AreaAlaska Geothermal Region
Alum Geothermal ProjectRam PowerHydrothermal Systems64 MW
64,000 kW
64,000,000 W
64,000,000,000 mW
0.064 GW
6.4e-5 TW
Silver Peak, NVAlum Geothermal AreaWalker-Lane Transition Zone
Bald Mountain Geothermal ProjectOski Energy LLCHydrothermal Systems20 MW
20,000 kW
20,000,000 W
20,000,000,000 mW
0.02 GW
2.0e-5 TW
Susanville, CA
Canby Cascaded Project Geothermal ProjectCanby GeothermalHydrothermal System5 MW
5,000 kW
5,000,000 W
5,000,000,000 mW
0.005 GW
5.0e-6 TW
Canby, NVCanby Geothermal AreaTransition Zone Geothermal Region
Clayton Valley Geothermal ProjectRam PowerHydrothermal Systems80 MW
80,000 kW
80,000,000 W
80,000,000,000 mW
0.08 GW
8.0e-5 TW
Silver Peak, NVSilver Peak Geothermal AreaWalker-Lane Transition Zone Geothermal Region
Cove Fort Geothermal ProjectOski Energy LLCHydrothermal Systems50 MW
50,000 kW
50,000,000 W
50,000,000,000 mW
0.05 GW
5.0e-5 TW
Kanosh, UtahCove Fort Geothermal AreaNorthern Basin and Range Geothermal Region
Crump Geyser Geothermal ProjectNevada Geo Power, OrmatHydrothermal Systems80 MW
80,000 kW
80,000,000 W
80,000,000,000 mW
0.08 GW
8.0e-5 TW
Utah: Energy ResourcesCrump's Hot Springs Geothermal AreaNorthwest Basin and Range Geothermal Region
Desert Queen Geothermal ProjectAlterra PowerHydrothermal Systems36 MW
36,000 kW
36,000,000 W
36,000,000,000 mW
0.036 GW
3.6e-5 TW
Fernley, NVDesert Queen Geothermal AreaNorthwest Basin and Range Geothermal Region
Dixie Valley Geothermal ProjectAlterra PowerHydrothermal SystemsNevada: Energy ResourcesDixie Valley Geothermal AreaCentral Nevada Seismic Zone Geothermal Region
El Centro/Superstition Hills Geothermal Project (2)Navy Geothermal ProgramHydrothermal SystemsEl Centro, NV
Fallon Geothermal ProjectGradient ResourcesHydrothermal System70 MW
70,000 kW
70,000,000 W
70,000,000,000 mW
0.07 GW
7.0e-5 TW
Fallon, NVFallon Geothermal AreaNorthwest Basin and Range Geothermal Region
Fallon-Main Geothermal ProjectNavy Geothermal ProgramHydrothermal Systems30 MW
30,000 kW
30,000,000 W
30,000,000,000 mW
0.03 GW
3.0e-5 TW
Fallon, NVFallon Geothermal AreaNorthwest Basin and Range Geothermal Region
Fireball Geothermal ProjectEarth Power Resources IncHydrothermal System32 MW
32,000 kW
32,000,000 W
32,000,000,000 mW
0.032 GW
3.2e-5 TW
Nixon, NVFireball Ridge Geothermal AreaNorthwest Basin and Range Geothermal Region
Granite Springs Geothermal ProjectAlterra PowerHydrothermal SystemsJessup, NV
Hawthorne Army Depot Geothermal ProjectNavy Geothermal ProgramHydrothermal SystemsHawthorne, NVHawthorne Geothermal AreaWalker-Lane Transition Zone Geothermal Region
High Valley Geothermal ProjectOski Energy LLCHydrothermal SystemsGlenbrook, UT
Hot Springs Point Geothermal ProjectEarth Power Resources IncHydrothermal System32 MW
32,000 kW
32,000,000 W
32,000,000,000 mW
0.032 GW
3.2e-5 TW
Austin, CA
Kelsey North Geothermal ProjectOski Energy LLCHydrothermal Systems75 MW
75,000 kW
75,000,000 W
75,000,000,000 mW
0.075 GW
7.5e-5 TW
Glenbrook, CA
Kelsey South Geothermal ProjectOski Energy LLCHydrothermal Systems75 MW
75,000 kW
75,000,000 W
75,000,000,000 mW
0.075 GW
7.5e-5 TW
Glenbrook, NV
Keystone/Mesquite Lake Geothermal ProjectRam PowerHydrothermal Systems100 MW
100,000 kW
100,000,000 W
100,000,000,000 mW
0.1 GW
1.0e-4 TW
Brawley, NVSouth Brawley Geothermal AreaGulf of California Rift Zone
McCoy Geothermal ProjectAlterra PowerHydrothermal Systems80 MW
80,000 kW
80,000,000 W
80,000,000,000 mW
0.08 GW
8.0e-5 TW
McCoy Geothermal AreaCentral Nevada Seismic Zone Geothermal Region
Mount Spurr Geothermal ProjectOrmatHydrothermal Systems
New River Geothermal ProjectRam PowerHydrothermal Systems50 MW
50,000 kW
50,000,000 W
50,000,000,000 mW
0.05 GW
5.0e-5 TW
Brawley, CaliforniaNew River Geothermal AreaGulf of California Rift Zone
Newberry I Geothermal ProjectNewberry GeothermalHydrothermal System120 MW
120,000 kW
120,000,000 W
120,000,000,000 mW
0.12 GW
1.2e-4 TW
La Pine, OregonNewberry Caldera Geothermal AreaCascades Geothermal Region
Panther Canyon Geothermal ProjectAlterra PowerHydrothermal Systems34 MW
34,000 kW
34,000,000 W
34,000,000,000 mW
0.034 GW
3.4e-5 TW
Pumpernickel Geothermal ProjectNevada Geothermal PowerHydrothermal Systems33 MW
33,000 kW
33,000,000 W
33,000,000,000 mW
0.033 GW
3.3e-5 TW
Winnemucca, Nevada
Reese River Geothermal ProjectRam PowerHydrothermal Systems40 MW
40,000 kW
40,000,000 W
40,000,000,000 mW
0.04 GW
4.0e-5 TW
Austin, NVReese River Geothermal AreaCentral Nevada Seismic Zone Geothermal Region
Salt Wells Geothermal ProjectGradient ResourcesHydrothermal Systems60 MW
60,000 kW
60,000,000 W
60,000,000,000 mW
0.06 GW
6.0e-5 TW
Fallon, IDSalt Wells Geothermal AreaNorthwest Basin and Range Geothermal Region
Silver Peak Geothermal ProjectRam PowerHydrothermal Systems24 MW
24,000 kW
24,000,000 W
24,000,000,000 mW
0.024 GW
2.4e-5 TW
Silver Peak, NVSilver Peak Geothermal AreaWalker-Lane Transition Zone Geothermal Region
Silver State Geothermal ProjectOski Energy LLCHydrothermal Systems25 MW
25,000 kW
25,000,000 W
25,000,000,000 mW
0.025 GW
2.5e-5 TW
Carvers, NV
Thermo Geothermal ProjectAlterra PowerHydrothermal Systems20 MW
20,000 kW
20,000,000 W
20,000,000,000 mW
0.02 GW
2.0e-5 TW
Thermo Hot Springs Geothermal AreaNorthern Basin and Range Geothermal Region
Truckee Geothermal ProjectRaser TechnologiesHydrothermal Systems
Upsal Hogback Geothermal ProjectAlterra PowerHydrothermal Systems
White Mountain Geothermal ProjectEureka Green SystemsHydrothermal System150 MW
150,000 kW
150,000,000 W
150,000,000,000 mW
0.15 GW
1.5e-4 TW


GEA Annual US Geothermal Power Production and Development Reports