Waste left behind by steelmaking could one day provide an inexpensive way to store solar energy for use when the sun is not shining, according to new research from Penn State. Solar energy is clean and widely available, but it has a basic limitation: sunlight disappears at night and may weaken during cloudy weather. Energy-storage […] The post Steelmaking Waste Could Become a Low-Cost Battery for Solar Heat appeared first on Knowridge Science Report .