A turbine assembly, which may be part of a turbine generator assembly, includes a turbine flywheel assembly and a magnet motor within a turbine casing. The turbine flywheel assembly comprises a turbine flywheel rotatably coupled to a shaft, turbine blade assemblies mounted thereon and a magnet motor rotor assembly coupled to the shaft. The magnet motor rotor assembly includes rotor permanent magnets arranged in a ring around the shaft. The same pole of each includes rotor permanent magnet faces outward away from the shaft. A magnet motor stator assembly comprises stator magnet assemblies, each comprising a stator electromagnet and a stator permanent magnet, arranged in a ring around the magnet motor rotor assembly to exert replusive force on the nearest rotor permanent magnet. Selectably controllable nozzles inject compressed air onto the turbine blades. Electromagnet controller(s) individually and selectably activate, deactivate and polarity-switch the stator electromagnets.