These are also known as water-based solar panels. They are usually placed in reservoirs, water treatment ponds or any body of water that is not used for recreation. The benefits of these water based panels are that they can prevent water from evaporating and deter algae from growing. The water also acts as a cooling agent for the solar panel. They are proving to generate up to 57% more energy than roof top panels. The panels are made of a non-corrosive material and are on a tracking system which allows them to move toward the direction of the most sunlight. Japan has been in the forefront of their use due to the unavailability of large areas of land for traditional solar panels. They are now becoming extremely popular in Australia and in the United States.