Electrical generators used in power stations of electric utilities are the largest electrical machines and probably the most challenging ones to design. Experience shows that in terms of overheating the stator end portion is one of the most sensitive areas of such machines. This overheating can harm the stator winding insulation and, thus, lead to severe failures. It can be based on both, high losses and insufficient local cooling. Until now, no integral solution was available for calculating the magnetic field, eddy current losses and temperature rises of the stator end portion on a routine basis. The calculation approach described in this book enables for such calculations for different design options and load conditions. Further, possibilities for reducing the temperature rises of the stator end teeth are discussed. This book can be helpful for engineers designing large power generators as well as specialist responsible for purchasing or maintaining generator technology. It can also help students in their advanced studies to get an insight into special challenges of electric machinery design.