K NEX Renewable Energy Model Building Kit includes 550 K'NEX pieces and color-coded building instructions to build 9 curriculum related models. Kit also comprises of one 1.38 V/500 mA solar panel, 3 motors and power cords, 1 capacitor for energy storage and a teacher's guide. Model ideal for secondary school students builds 3 models at a time. Students generate electricity to make models operate as they experiment with renewable energy systems. Also students compare and contrast the power and efficiency that can be realized from wind, solar and water powered machines.