K nex 78976 550 piece renewable energy set for 6 to 12 students k nex 78976 the k nex 78976 renewable energy set allows students to compare and contrast the power and efficiency that can be realised from wind solar and water powered machines students generate electricity to operate their models as they experiment with renewable energy systems p p the set makes 9 different models up to 3 at a time and contains 550 parts sufficient for 6 to 12 students it contains 1x 1 38v 500ma solar