Production flexibility of small run-of-river power plants: KWGO smart-storage case study

Abstract In the framework of new Swiss feed-in-tariff system for Small Hydropower Plants (SHP), aim SmallFLEX project, led by HES-SO Valais and performed in collaboration with EPFL, WSL, EAWAG, PVE FMV, is to show how SHP can provide winter peak energy ancillary services, whilst remaining eco-compatible. The pilot demonstrator site selected Gletsch-Oberwald (KWGO) owned FMV commissioned end 2017. This run-of-river power plant equipped two six-jets Pelton turbine units featuring a maximum 7.5 MW each while average annual lower than 5 MW, production during summer. capacity infrastructure, equipment, other adaptation measures produce flexible way being assessed measuring impact this operation on environment, revenues. paper focuses experimental campaigns numerical simulations carried out assess flexibility means smart use existing infrastructure as additional storage volumes: settling basin, forebay upper part headrace tunnel.