Techno-Economic Assessment of Geothermal Energy Resources in the Sedimentary Basin
in Northeastern British Columbia

Project code: 2016-047

Project type: Geothermal

Proponent: University of Victoria

Principal Investigators: Dr. Peter Wild and Kevin Palmer-Wilson

Project location: Northeastern BC


Summary
This project evaluates four favourable areas for potential geothermal development in northeastern British Columbia: Horn River, Clarke Lake, Prophet River and Jedney.

The Need
Geothermal resources may play a significant role in the long-term energy strategy for BC as we transition to alternative energy sources to generate electricity and heat. However, a major barrier to geothermal development is its high level of uncertainty in terms of cost and available resource.

To help answer questions surrounding potential geothermal resource development in northeastern British Columbia, this study quantifies the amount of electricity that could be produced at four locations and estimates the cost for operating those plants.

Project Goals
The project:

  • generated a geothermal favourability map to assess high-potential locations in northeastern BC;
  • identified four areas favourable for geothermal development: Horn River, Clarke Lake, Prophet River and Jedney;
  • estimated gross electric power output using the latest techno-economic assessment methods developed by specialists; and
  • assessed the capital costs of developing geothermal power plants by calculating industry-standard key financial indicators.

Project Benefits
The results from this project build on previous geothermal research in the project area to improve our understanding of the investment required for geothermal exploration and development in northeastern BC along with potential levelized costs of electricity.

Survey Area
The area of investigation is in northeastern British Columbia. It extends east of the Rocky Mountains to BC's border with Alberta and north of Fort St John to the border with the Northwest Territories. The underlying geology is the BC portion of the Western Canada Sedimentary Basin (WCSB).

How was the data collected?
Northeastern BC has been subject to substantial oil and gas development, and a significant public database of well data is available from the BC Oil and Gas Commission (BCOGC). In this study, the BCOGC database was used to assess potential electricity production and the cost of geothermal power plants in the BC section of the WCSB.

What was found?
The researchers created a geothermal favourability map of northeastern BC. In conjunction with geological and economic criteria, they used the map to select four favourable sites: Horn River, Clarke Lake, Prophet River and Jedney. For each site, researchers used the area of known gas pools to estimate geothermal reservoir areas and to estimate power plant sizes ('proxy power plants'). From this, the amount of available electric power (in megawatts, MW) that could be generated was estimated based on variables such as volume, flow rates, and salinity.

Simple economic models were developed for each of the four proxy power plants, using capital costs (cost to build the plant and drill the necessary number of wells) and specific measures of financial viability (see below), to find the levelized cost of producing electricity in dollars per mega-watt hour (MWh) of energy produced.

Horn River: 3.7 MW @ 162 $/MWh
Clarke Lake: 44.5 MW @ 166 $/MWh
Prophet River: 22.0 MW @ 144 $/MWh
Jedney: 7.8 MW @ 156 $/MWh

Calculations used to compare financial viability of the four projects include:

  • Levelized Cost of Energy (LCOE): the cost at which electricity is produced throughout the lifetime of the project. Any power plant technology can be compared via LCOE.
  • Net Present Value (NPV): the difference between all discounted costs and revenues. Comparing the NPV of different projects helps establish which has greater financial returns.
  • Internal Rate of Return (IRR): equal to the discount rate at which the NPV becomes zero.
Final Deliverables
  • Geoscience BC Report 2018-18: Techno-Economic assessment of Geothermal Energy Resources in the Sedimentary Basin in Northeastern British Columbia, Canada
The Detail

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