Category Archives: Coniston GS

OPG: Proposed Coniston Generating Station Life Extension Project Environmental Report

Wherever water levels have been lifted from their former undeveloped elevation must be considered the full extent of the reservoir/s. This crucial detail is not set out in the ER; however, the full extent of the cascading facilities must be considered when detecting, measuring and reporting total GHG emissions (CH2, CH4 and N2O). This cascading system creates one very large artificial and ongoing multi-level series of reservoirs that are highly regulated through the WRWMP, and likely very high in GHG emissions.

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Coniston Generating Station Upgrade – Life Extension Project

Hydroelectric is not emission-free or clean. A Washington State University study on the effects of damming conducted in a central European impounded river revealed that the reservoir reaches are a major source of methane emissions and that areal emission rates far exceed previous estimates for temperate reservoirs or rivers. It showed that sediment accumulation correlates with methane production and subsequent ebullitive release rates. Results suggested that sedimentation-driven methane emissions from dammed river hot spot sites can potentially increase global freshwater emissions by up to 7%.[1]  Hydroelectric facilities need to acknowledge and account for the associated GHG emissions they produce.

[1] Maeck, A., DelSontro, T., McGinnis, D.F, Fischer, H., Flury, S., Schmidt, M., Fietzek, P. and Lorke, A., 2013.  Sediment Trapping by Dams Creates Methane Emission Hot Spots, Environmental Science and Technology, 8130-8137, Online: http://www.dx.doi.org/10.1021/es4003907

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