Table 1: Reservoirs for storage and pumped-storage SHP schemes

Stream Dammed stream (e.g., SHP plant, flood protection weir)
Natural small unused lake (if ecological value allows hydropower usage)
Glacier (with global warming glaciers become new lakes)
Underground water Underground water lake
Infrastructure Artificial snow making reservoir (especially to be used in summer)
Irrigation reservoir (in mountain areas especially to be used in winter)
Drinking water reservoir (in mountain areas especially to be used during off-tourism season)
Unused military infrastructure (e.g., in the Swiss alps)
Inoperative gallery (e.g., former construction or purge galleries)
Unused mining gallery