Sure Chill is a cooling technology that can allow products to stay cool using mains electricity or renewable solar power. Sure Chill uses a phase change material instead of batteries to store energy until it is needed. It has been used to power a vaccine refrigerator recognized by the World Health Organization that can operate on a mains supply of less than five hours a day. After it is charged, it can maintain a constant cooling below 10 degrees Celsius without any power for over 10 days. Sure Chill also has an intelligent monitoring system to keep temperatures stable if there are any hotspots in order to extract heat and protect the stock of vaccines.