The Madaras Rotor Power Plant concept has been analysed and updated to determine its capability to compete technically and economically with conventional horizontal axis wind-turbine generators. This concept, developed in the 1930s utilises rotating cylinders, vertically mounted on flat cars, to react with the wind (Magnus effect) and propel an endless train of cars around a closed track at constant speed. Alternators geared to the wheels of each car generate electrical power, which is transmitted to a power station by a trolley system.