 Researchers at Stanford University are developing "eTextiles" — batteries made of fabric — that might serve to store power generated by such technology.Thermal resonator technology allows generation of power from the daily change of temperature, even when there is no instantaneous temperature difference as needed for thermoelectric generation, and no sunlight as needed for photovoltaic generation.A phase change material such as octadecane is selected which can change from solid to liquid when the ambient temperature changes a few degrees celsius.