Sulas Industries has developed a groundbreaking approach to solar tracking that uses no motors, gears or electronics. Sulas’ patented HelioDrive technology uses the power of the sun, acting on a small amount of phase change material through simple optics, to actuate a single moving part to accurately and cost effectively track the sun's path across the sky. The large hydraulic force generated by the HelioDrive can be used to rotate a collection of photovoltaic (PV) panels, allowing them to follow the sun and increase their energy yield.