I'm trying to understand exactly how power plant generators increase power output. So I will explain what I think is right. To increase the power output of a generator more torque from the prime mover is required to increase the torque angle between the voltage impressed on the stator from the grid with the voltage impressed on the stator from the rotor field. As the torque angle increases up to 90 degrees the two voltages will be more in phase and be additive which will result in a larger amount of current produced in the stator. Thus increasing the power output. Can someone correct me, and what happens with the phases between the voltage and current when the torque angle is increased. Is there still a lagging power factor or does the current align with the sum of the two voltages. I'm probably wrong in my thinking but some clarification would be very much appreciated.