generating apparatus 1 may include an inverter 47 an input of the inverter being connected to an output terminal of the battery device 45 and power output of the inverter 47 being provided for household electric use or for being sent to the electric grid the invention may be further understood by description of a exemplary implementation a power generating apparatus 1 has a fixed frame not shown the drive unit 3 includes an axel 19 supported on a axel bearing fixed on the frame the axel is connected to a first drive arm 17 and a second drive arm 29 each of which may be about seven feet long and of a rigid material for example a steel beam the first drive arm 17 is connected to a weight load 37 through a steel cord 39 routed via a first pulley wheel 41 fixed on the floor and a second pulley wheel 42 at the top of the frame a weight load 37 of about 600 pounds is connected at the end of the steel cord 39 the weight load 37 is placed at the top of a compressed air driven power source 28 a counter balance weight 35 of about 300 pounds is connected to the end 33 of the second drive arm 29 the compressed air driven power source 28 includes a vertical hollow cylinder 27 about 8 foot high and 1 5 foot in diameter and an inflatable airbag 25 placed inside the cylinder at a resting state the air bag 25 is deflated and the weight load 37 is hung low inside the cylinder 27 when the air bag 25 is inflated by a compressed air source.