Snoqualmie Falls Hydroelectric Plant
... that Plant 1 of Snoqualmie Falls Hydroelectric Plant, completed in 1899, was the first completely underground hydroelectric power plant?
... that Plant 1 of <b id="mwClc"><a href="./Snoqualmie_Falls_Hydroelectric_Plant" id="mwClg" rel="mw:WikiLink" title="Snoqualmie Falls Hydroelectric Plant">Snoqualmie Falls Hydroelectric Plant</a></b>, completed in 1899, was the first <a href="./Underground_power_station" id="mwClk" rel="mw:WikiLink" title="Underground power station">completely underground hydroelectric power plant</a>?