The invention discloses a non-fuel combusting air turbine assembly suitable as a stand alone system for generating electricity. The systems include an air turbine engine powered by a compressor mechanism to increase the potential energy that can be harnessed by the turbines, having a noise reducing air intake section for delivering air to the compressor. Additionally, the systems include a turbine mechanism composed of plural sets of stationary vanes and rotating vanes, preferably arranged alternatively, and a battery rechargeable by a generator operable by the rotating turbine vanes. To initiate starting the turbine assembly, a secondary power source is included.