Closed-loop pumped storage hydropower (PSH) systems generally have a lower impact on aquatic ecosystems compared to open-loop systems for several reasons:
Impact Comparison: Closed-Loop vs. Open-Loop PSH
- Connectivity to Natural Water Bodies: Closed-loop PSH systems are not continuously connected to naturally flowing water features like rivers, lakes, or wetlands, which reduces their impact on aquatic ecosystems. In contrast, open-loop systems are directly connected to such bodies, often through damming, which can disrupt natural water flows and impact aquatic life significantly.
- Aquatic Ecology Impacts: Open-loop projects tend to have higher impacts on fish and other aquatic ecology due to the initial effects of damming natural water bodies for reservoir creation. Closed-loop projects, while potentially having similar impacts during initial water withdrawals, generally have shorter duration impacts and are less invasive overall.
- Water Usage and Withdrawals: Closed-loop systems minimize water usage from natural sources beyond initial fills and periodic top-ups for evaporative losses, thereby avoiding long-term disruptions to aquatic habitats. Open-loop systems, however, continuously interact with natural water flows, potentially leading to more significant aquatic impacts.
- Siting Flexibility: Closed-loop systems offer greater siting flexibility, allowing them to be placed in locations that minimize environmental disturbances, including those to aquatic ecosystems. This flexibility reduces the likelihood of impacting sensitive aquatic habitats.
Overall, the reduced connectivity to natural water bodies and the localized nature of closed-loop PSH systems contribute to their generally lower impact on aquatic ecosystems compared to open-loop systems.
Original article by NenPower, If reposted, please credit the source: https://nenpower.com/blog/how-do-closed-loop-psh-systems-affect-aquatic-ecosystems-compared-to-open-loop-systems/
