Current practices in the monitoring of large steam turbine generators are briefly discussed, consideration being given to the traditional range of turbine supervisory equipment, and the more extended facilities which are sometimes now associated with rotating machinery, such as vibration monitoring, together with the more generalised data logging systems now specified by some Utilities. Consideration is given to the possible range of parameters and equipment areas which may now be incorporated into a monitoring scheme, and attention is drawn to the advances in display technology and operator interfaces which are now possible at moderate cost. In a concluding section, a range of monitoring functions which could be of wide general application in the field of steam turbine generators is discussed.