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Temperature is a key parameter to monitor in assessing the condition of an electric generator.Two (2) methods of efficient temperature detection on generators,at two (2) separate power plants,are presented in this paper.It begins with the Mercier Hydroelectric power plant in Quebec,Canada,which has been experiencing chronic overheating at one of their units.They had been monitoring rotor pole temperature with the OEMs system,installed directly on the rotor.Contacted by the Mercier personnel looking for a permanent alternative for rotor temperature monitoring,VibroSystM installed the ThermaWatch RotorTM on site.The first part of this paper explores the applications and findings of using non-contact technology to monitor rotor pole face,coil winding, and connector temperature of large rotating machines.The second part will focus on the use of an isolated and rugged contact fiber optic sensor to monitor a suspected overheating issue at Hydro-Quebecs Rapide-2 power station in Quebec,Canada.On Unit 23,overheating of the new slip-rings inside the collector compartment was suspected.To collect more precise data,brushgear temperature sensors were installed.An abnormal temperature rise of the brushgear was detected.Corrective actions were taken by the original equipment manufacturer (OEM) after test results confirmed overheating.Data collected after warranty work confirmed the problem had been resolved.This paper shows that VibroSystMs contact and non-contact temperature monitoring technologies provide a reliable,permanent,and a useful means to help generator personnel to keep their generators running efficiently and safely.