The G-res Tool

For assessing and reporting the greenhouse gas emissions of a reservoir.

Understand and report reservoir GHG emissions:

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Pre-impoundment

Natural emissions


All ecosystems, including river systems, naturally emit greenhouse gases, such as carbon dioxide and methane.

When a reservoir is created, there will be a change in GHG emissions which are dependent on local environmental conditions.



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Post-impoundment

Net emissions


Greenhouse gases can be released when a reservoir is introduced due to the decomposition of organic material in the flooded area.



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Assessment

Web-based tool


The G-res Tool uses readily available input data to estimate the change in emissions resulting from the impoundment of an existing or planned reservoir.

The online tool takes into account emissions related to human activities and infrastructure and allocates these to various reservoir purposes.



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Reporting

Sustainability


The tool allows companies and researchers to report publicly the estimated net greenhouse gas emissions caused by the creation of a reservoir.

The assessment framework uses a methodology based on empirical measurements from more than 200 reservoirs worldwide.


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An internationally recognised tool


A decade in development, the GHG Reservoir (G-res) Tool was created through a multi-stakeholder research project led by the International Hydropower Association (IHA) and the UNESCO Chair for Global Environmental Change.

The tool uses a conceptual framework created with scientists from the University of Quebec at Montreal (UQAM), the Norwegian Foundation for Scientific and Industrial Research (SINTEF) and the Natural Resources Institute of Finland (LUKE).

Initiative partners:
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In collaboration with:
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For hydropower


The G-res Tool is designed to help hydropower companies and researchers estimate and report the net greenhouse gas emissions of a reservoir.

Reporting results gained using the G-res Tool will give investors, regulators and local communities greater confidence in a reservoir’s climate profile and carbon footprint.



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Reliable and cost-effective


Hydropower, when planned and designed correctly, is regarded to be among the lowest-carbon sources of renewable electricity generation.

Before now, however, there was no reliable and cost-effective way of estimating the emissions created from building a reservoir, taking into account pre-existing conditions and naturally occurring emissions.
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Access the tool

In quotes:

“The development of the G-res Tool is a major milestone in the research on GHG from reservoirs. This is the first scientifically based tool for planners and designers to quantify reservoir emissions.“

– The World Bank

“Another innovative feature of the G-res Tool is its ability to calculate the net impact of a future reservoir on the GHG regime of a particular site. This is a significant breakthrough.“

– Yves Prairie, UNESCO Chair in Global Environmental Change