Abstract: A solar-powered ventilation system for a building structure for ventilating building structures even during no wind days. The solar-powered ventilation system for a building structure includes a building structure having a roof and a conduit member extending through the roof inside the building structure; and also includes a turbine member being securely mounted to the building structure over the conduit member and having a centrally-rotating spindle and a plurality of curved vanes securely attached to and spaced about the spindle; and further includes solar panels securely mounted to a top of the conduit member and upon which the turbine member is rotatably mounted, a motor connected to the spindle for the rotation thereof, and a battery connected to the motor and to the solar panels for storing electrical energy and for energizing the motor.