ill way ▁that ▁has ▁a ▁dis charge ▁capacity ▁of ▁. ▁The ▁storage ▁capacity ▁of ▁the ▁res er voir ▁is ▁ ▁while ▁ ▁can ▁be ▁used ▁for ▁power ▁generation . ▁The ▁catch ment ▁area ▁for ▁Chi ot as ▁is ▁ ▁and ▁the ▁res er voir ▁reaches ▁a ▁maximum ▁depth ▁of ▁. ▁ ▁When ▁power ▁generation ▁is ▁required , ▁water ▁is ▁released ▁from ▁either ▁upper ▁res er voir ▁back ▁down ▁to ▁the ▁power ▁station ▁and ▁its ▁gener ators . ▁The ▁power ▁station ▁is ▁located ▁under ground ▁and ▁consists ▁of ▁transform er , ▁val ve ▁gallery ▁and ▁generator ▁hall ▁ca ver ns . ▁From ▁the ▁Chi ot as ▁res er voir , ▁water ▁is ▁sent ▁back ▁through ▁a ▁ ▁long ▁tunnel ▁and ▁when ▁near ▁the ▁power ▁plant , ▁it ▁spl its ▁into ▁a ▁ ▁system ▁of ▁pen stock s ▁which ▁feed ▁each ▁of ▁its ▁eight ▁ ▁p ump - gener ators . ▁Water ▁from ▁the ▁R ov ina ▁is ▁processed ▁by ▁a ▁single ▁ ▁generator . ▁After ▁the ▁water ▁is ▁used ▁for ▁power ▁generation , ▁it ▁is ▁dis charg ed ▁into ▁a ▁ ▁long ▁tail - race ▁tunnel ▁and ▁into ▁L ago ▁D ella ▁Pi ast ra . ▁Both ▁the ▁tail - race ▁and ▁power ▁plant ▁int ake ▁are ▁protected ▁from ▁water ▁ham mer ▁by ▁sur ge ▁t anks . ▁The ▁drop ▁in ▁elev ation ▁between ▁the ▁upper ▁res er voir s ▁and ▁the ▁power ▁plant ▁afford ▁the ▁Chi ot as ▁a ▁maximum ▁hyd ra ul ic ▁head ▁of ▁ ▁and ▁the ▁R ov ina ▁.