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sohi-
Or 1924
https://en.m.wikipedia.org/wiki/WalchensÂee_Hydroelectric_Power_StationMy understanding is that Walchensee is just a Hoover-Dam-Style station with additional flow diverted from other rivers. That's a traditional hydroelectric generating station, not a pumped hydro storage system like Dinorwig.
Dinorwig's upper lake doesn't have a very large catchment area for rainfall, so most of the water that flows down the pipes was previously pumped up the same pipes.
Emyr
We figured it out decades ago, opened in 1984:
https://youtu.be/McByJeX2evM
Two lakes with a 535M elevation difference. 9.1GWh of storage, max output 1.7GW, so about 5 hours at full chat.