No, it is worse than that. If you think of two generators connected together in a power grid, they need to have the same frequency and the same phase. If one

No, it is worse than that. If you think of two generators connected together in a power grid, they need to have the same frequency and the same phase. If one of the generators slows a little bit, it begins drawing current from the other. It in effect becomes a motor. Power flows as a proportion to the difference in phase angle.