:::Sorry it took so long for me to see this one. Some pumped-storage stations have an infobox dam, like Grand'Maison Dam. It is usually cases when the dam is the most notable part of the system and subsequently, the upper or lower reservoir (whichever the subject dam creates), is substantially larger than its opposite. In systems when the dams and reservoirs are similar sizes, infobox power station tends to apply. I see that opinion doesn't matter much more though...