Finally, at each phase of a project’s development a geothermal developer has the opportunity to report two project capacity estimates: a Resource Capacity estimate and a Planned Capacity Addition (PCA) estimate. At each project phase the geothermal resource capacity estimate may be thought of as the megawatt (MW) value of the total recoverable energy of the subsurface Geothermal Energy Association 5 geothermal resource. It should not be confused with the PCA estimate, which is defined as the portion of a geothermal resource that “the developer deems to be viable for the economic production of electricity under existing economic conditions.” In other words, if the developer were to utilize the geothermal resource under its control to produce electricity via a geothermal power plant, the PCA estimate would be the power plant’s estimated installed capacity. In the case of an expansion to a conventional hydrothermal geothermal plant, the PCA estimate would be the estimated capacity to be added to the plant’s current installed capacity.

In each phase of development the resource and installed capacity estimates are given different titles that reflect the level of certainty of successful project completion. The different titles as they correspond to the separate phases are as follows: Phase I: “Possible Resource Estimate” and “Possible PCA Estimate” Phase II: “Possible Resource Estimate” and “Possible PCA Estimate” Phase III: “Delineated Resource Estimate” and “Delineated PCA Estimate” Phase IV: “Confirmed Resource Estimate” and “Confirmed PCA Estimate” This section outlines how the Geothermal Reporting Terms and Definitions influence the reporting and presentation of project in development information in this report. For a detailed explanation of each phase of development and the outline of its sub-criteria please consult GEA’s Geothermal Reporting Terms and Definitions