Phase III - Permitting and Initial Development

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GEA Development Phase III: Permitting and Initial Development

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)

Contents


Phase III - Criteria

In reporting a Phase III 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 geothermal Phase III 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 III development is specified below.


1. Resource Development Criteria

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

  • At least one full size production well drilled and operational
At least one full sized production well with a bottom hole temperature and flow rates sufficient for a commercial size geothermal well (typically 3 to 5 MW gross) drilled.
  • At least one full size injection well drilled and operational
At least one full size injection well capable of recharging the geothermal resource drilled.
  • Reservoir characterization completed and sustainable reservoir capacity determined
The developer has adequately characterized fluid flow within the rock mass of the geothermal reservoir and has also determined the sustainable capacity of the geothermal reservoir with relative accuracy. This may include a flow test performed including two production wells and one injection well confirming at least 20% of proposed contract capacity.


2. Transmission Development Criteria

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

  • Interconnection feasibility study complete
The steps and resources necessary for connecting the geothermal power plant to the transmission system of an identified utility have been identified by the developer.
  • System impact study (SIS) underway or complete
The utility has assessed the adequacy of the targeted transmission system to accommodate the additional electricity provided by the developer and whether additional costs may be incurred to provide transmission service.
  • Interconnection facility study underway
The utility has begun to identify to the developer the steps, equipment, and costs necessary to complete the interconnection.
  • Transmission Service Request Submitted (if appropriate)
In the event that power from the developers geothermal development project must be transmitted through the transmission systems of one or more utilities to the point of delivery, the developer will have submitted a Transmission Service Request to the utilities whose transmission systems will need to accommodate the delivery of MW to the point of delivery.


3. External to Resource Development Criteria

For a project to be considered a Phase III project at least two of the following External to Resource Development criteria must be met.

  • Plant permit application complete or in process
The developer has submitted, or is in the process of submitting, an application to the appropriate state agencies for the construction and operation of the proposed geothermal power plant.
  • Power purchase agreement secured or in negotiation
The developer (provider) and the identified power purchaser (host) have entered, or are in the process of entering into, a legal agreement regarding the purchasing of electricity from the provider by the host where that electricity is provided via the planned geothermal power plant.
  • Financing secured, or being secured, for portion of project construction
The developer has secured financing sufficient to meet the project PPA requirements and make the initial deposit for power plant equipment.


Phase III - Terms & Definitions

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

  • Delineated Resource Estimate
A Delineated Resource is a geothermal project that has undergone exploration testing and drilling to the extent needed to construct an accurate characterization of the geothermal reservoir as well as to give an accurate estimation of total recoverable energy.
Specifically, as mentioned above, the developer of a geothermal project must fulfill two of the criteria listed in the Phase III Resource Development Category, two of the criteria listed in the Phase III Transmission Development Category, and two of the criteria listed in the Phase III External Development Category.
It should be noted that the Delineated 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.
  • Delineated Planned Capacity Addition (PCA) Estimate (MW)
The Phase III Delineated Planned Capacity Addition (PCA) estimate is that portion of a Delineated Resource that the developer deems to be viable for the economic production of electricity under existing economic conditions. Also, the Delineated 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 III Delineated PCA estimate would be the power plants estimated installed capacity. If the developer were expanding a currently operating plant the Phase III Delineated PCA estimate would be the estimated capacity to be added to the plants current installed capacity.

Phase III - Projects

Technique
Developer

Project
Type
Capacity
Estimate
(MW)

Location

Geothermal
Area

Geothermal
Region
GEA
Report
Date
Black Rock I Geothermal Project CalEnergy Generation Hydrothermal System North Shore Mono Lake Geothermal Area Walker-Lane Transition Zone Geothermal Region
Black Rock II Geothermal Project CalEnergy Generation Hydrothermal System North Shore Mono Lake Geothermal Area Walker-Lane Transition Zone Geothermal Region
Black Rock III Geothermal Project CalEnergy Generation Hydrothermal System North Shore Mono Lake Geothermal Area Walker-Lane Transition Zone Geothermal Region
Carson Lake Geothermal Project Ormat Hydrothermal System Carson Lake Corral Geothermal Area Northwest Basin and Range Geothermal Region
Darrough Hot Springs Geothermal Project Great American Energy Hydrothermal System 30 MW30,000 kW
30,000,000 W
30,000,000,000 mW
0.03 GW
3.0e-5 TW
Carvers, OR Darrough Hot Springs Geothermal Area Northern Basin and Range Geothermal Region
Dead Horse Geothermal Project Ormat Hydrothermal System Dead Horse Wells Geothermal Area Walker-Lane Transition Zone Geothermal Region
Geysers Project Geothermal Project Ram Power 33 MW33,000 kW
33,000,000 W
33,000,000,000 mW
0.033 GW
3.3e-5 TW
Geysers Geothermal Area Holocene Magmatic
Lightning Dock II Geothermal Project Raser Technologies Lordsburg, NV Lightning Dock Geothermal Area Rio Grande Rift
Miravalles V Geothermal Power Plant Ormat International Conventional Hydrothermal Expansion 12 MW12,000 kW
12,000,000 W
12,000,000,000 mW
0.012 GW
1.2e-5 TW
Bagaces, Guanacaste, Costa Rica Miravalles Geothermal Area Central American Volcanic Arc Chain
Neal Hot Springs Geothermal Project U.S. Geothermal Hydrothermal System Vale, Oregon Neal Hot Springs Geothermal Area Snake River Plain
New York Canyon Geothermal Project Terra-Gen Hydrothermal System 100 MW100,000 kW
100,000,000 W
100,000,000,000 mW
0.1 GW
1.0e-4 TW
Winnemucca, Nevada New York Canyon Geothermal Area Central Nevada Seismic Zone Geothermal Region
Orita I Geothermal Project Ram Power Hydrothermal System 150 MW150,000 kW
150,000,000 W
150,000,000,000 mW
0.15 GW
1.5e-4 TW
Orita, CA
Patua Geothermal Project Gradient Resources Hydrothermal System 120 MW120,000 kW
120,000,000 W
120,000,000,000 mW
0.12 GW
1.2e-4 TW
Fernley, NV Patua Geothermal Area Walker-Lane Transition Zone Geothermal Region
Raft River II Geothermal Project U.S. Geothermal 114 MW114,000 kW
114,000,000 W
114,000,000,000 mW
0.114 GW
1.14e-4 TW
Raft River, AK Raft River Geothermal Area Northern Basin and Range Geothermal Region
San Emidio II Geothermal Project U.S. Geothermal Conventional Hydrothermal (Produced) 44 MW44,000 kW
44,000,000 W
44,000,000,000 mW
0.044 GW
4.4e-5 TW
Empire, NV San Emidio Desert Geothermal Area Northwest Basin and Range Geothermal Region
Wister I Geothermal Project Ormat Hydrothermal System Wister, ID Wister Geothermal Area Gulf of California Rift Zone


GEA Annual US Geothermal Power Production and Development Reports