In the use of electrical appliances in a teroritis all electrical equipment has a life limit as well as generator generator, of course the longer generator generator is used then the generator will experience a decrease in performance. In this final project will be conducted "Performance Analysis of Generator QF-110-2 PLTU Sebalang" using generator output tolerance calculation, generator output graph observation and generator capability curve analysis. From the results of generator performance analysis will be very useful both for the author and for the PLTU because the results can know whether the generator is still in a reliable condition or not. Performance of generator QF-110-2 PLTU Sebalang still in a reliable condition, this is evidenced by the observation results of the generator capability curve that is active power 82.7 MW; Reactive power 38.1 MVAR and 0.92 Power Factor work under normal conditions (Legging). The generator output for the highest frequency is 50,24652 Hz and the lowest frequency 49,8926 Hz is still within the tolerance range due to the tolerance limit for maximum frequency of 50.5 Hz and the minimum frequency is 49.5 or ± 1% from 50Hz. While the highest voltage output is 13,9203 kV and the lowest is 13,7443 kV also still in tolerance limit, because the tolerance limit for maximum voltage is 14,49 kV and the minimum voltage is 13,11 kV or ± 5% from 13.8kV This result also membutikan that the performance of the generator is still in a reliable state