Mid Sweden University

Climate change is a big challenge for humanity to overcome. To limit thehuman impact on the climate, a shift towards renewable energy systems is anecessity. All emission scenarios that limit global warming to 1.5 ° C requirethat we use large-scale carbon capture and storage (CCS). Although CCS hasstarted to be used at large anthropogenic emission sources, implementationof CCS at natural carbon sources is rare. Freshwater lakes and rivers aresources of carbon dioxide and are important parts of the global carbon cycle.Similarly, hydropower plant reservoirs are sources of greenhouse gases. Theturbulence and drastic pressure changes that occur when the water passesthrough the hydropower plant turbines will theoretically increase theefficiency of the CO2 emissions from the water. This study investigates thepotential for Hydropower Carbon Capture and Storage (HPCCS) bymeasuring CO2 concentration in the water upstream and downstream of ahydropower plant. The study site was the hydropower plantKattstrupeforsen located in Indalsälven, northern Sweden. Measurementswere performed during April-May 2022. The total CO2 emission fromKattstrupeforsen was calculated based on the upstream-downstreamgradient in CO2 and discharge. The annual emissions from Kattstrupeforsenwere 1200-2000 t CO2 yr-1. That equals the annual average emissions from750-1200 passenger cars in Sweden. The measured concentration differenceswere within the range of previous literature, although low in comparison.