A system comprising: a prime mover configured to rotate a shaft ; and a wound rotor induction generator, WRIG, comprising: a rotor coupled to the shaft of the prime mover and configured to rotate when the shaft rotates, the rotor comprising a rotor winding ; and a stator winding (112, 212a-212b, 300, 400, 420, 512a-512c, 612a-612c, 712a-712c) electrically connected to a utility source (130, 230, 530a-530b, 630a-630b, 730) and a load ; wherein: when the stator winding (112, 212a-212b, 300, 400, 420, 512a-512c, 612a-612c, 712a-712c) does not receive first power from the utility source (130, 230, 530a-530b, 630a-630b, 730), the WRIG is configured to generate second power due to kinetic energy of the rotor , and output at least a portion of the second power to the load , characterized in that when the stator winding (112, 212a-212b, 300, 400, 420, 512a-512c, 612a-612c, 712a-712c) receives the first power from the utility source (130, 230, 530a-530b, 630a-630b, 730), the WRIG is configured to transform at least one of a voltage and a frequency of the first power before outputting at least a portion of the first power to the load . a prime mover configured to rotate a shaft ; and a wound rotor induction generator, WRIG, comprising: a rotor coupled to the shaft of the prime mover and configured to rotate when the shaft rotates, the rotor comprising a rotor winding ; and a stator winding (112, 212a-212b, 300, 400, 420, 512a-512c, 612a-612c, 712a-712c) electrically connected to a utility source (130, 230, 530a-530b, 630a-630b, 730) and a load ; a rotor coupled to the shaft of the prime mover and configured to rotate when the shaft rotates, the rotor comprising a rotor winding ; and a stator winding (112, 212a-212b, 300, 400, 420, 512a-512c, 612a-612c, 712a-712c) electrically connected to a utility source (130, 230, 530a-530b, 630a-630b, 730) and a load ; wherein: when the stator winding (112, 212a-212b, 300, 400, 420, 512a-512c, 612a-612c, 712a-712c) does not receive first power from the utility source (130, 230, 530a-530b, 630a-630b, 730), the WRIG is configured to generate second power due to kinetic energy of the rotor , and output at least a portion of the second power to the load , characterized in that when the stator winding (112, 212a-212b, 300, 400, 420, 512a-512c, 612a-612c, 712a-712c) receives the first power from the utility source (130, 230, 530a-530b, 630a-630b, 730), the WRIG is configured to transform at least one of a voltage and a frequency of the first power before outputting at least a portion of the first power to the load . when the stator winding (112, 212a-212b, 300, 400, 420, 512a-512c, 612a-612c, 712a-712c) does not receive first power from the utility source (130, 230, 530a-530b, 630a-630b, 730), the WRIG is configured to generate second power due to kinetic energy of the rotor , and output at least a portion of the second power to the load , characterized in that when the stator winding (112, 212a-212b, 300, 400, 420, 512a-512c, 612a-612c, 712a-712c) receives the first power from the utility source (130, 230, 530a-530b, 630a-630b, 730), the WRIG is configured to transform at least one of a voltage and a frequency of the first power before outputting at least a portion of the first power to the load . <EOS>