Current operating practices impose severe thermal and mechanical stresses on the rotors and stators of large pump storage hydro-generators. One such practice involves multiple daily run-ups and run-downs of machines which can lead to premature ageing and cycle-related stator winding deterioration. Pump storage, hydro-generator and nuclear turbo-generator designs feature extremely long end-windings and complex bracing systems which are subjected to strong mechanical and electrical stresses. Life extension and increased availability can only be achieved through the continuous monitoring of end-winding structures and stator bars for anticipated degradations.