From Open Energy Information


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Applying the Methodology to Geothermal Projects

Getting Started

The geothermal resource reporting methodology (GRRM) is based on the concept that a geothermal system can (and should) be described both in terms of

  • Resource Grade - the quality of the geothermal resource as it relates to the potential to extract heat, and
  • Resource Knowledge - the progress of research and development over the lifetime of the project.

The grade of a geothermal resource can be described as a combination of these intrinsic features of the geology that differentiate geothermal projects. The GRRM expands upon the concept of grade by considering not only the physical attribute ("character"), but also how the attribute is measured ("technique") and what is known about the quality of the data ("execution"). Just as each attribute is assessed independently from others for the purpose of the framework, these indices are also independently evaluated for each attribute.

The knowledge of the resource is designed to track the development progress of the project, from initial site scoping to the drilling of the well field. The GRRM breaks the concept of resource knowledge into two complimentary assessments: a level of information, and a level of certainty. As increased knowledge of the geothermal system is gained (e.g., with additional exploration activities, up to and including the drilling of production wells), the certainty in the knowledge takes into account potential differences in the complexity of the reservoir modeling and the quality of the data collected.

The pages in this section are designed to help understand the information needed as well as the process to implement the GRRM for geothermal projects.