We have a solar tracking device that uses phase change of paraffin wax when heated inside a solar receiver. With a helical slot in a torque tube we can translate the expansion into rotational motion. We use this rotation to point solar panels at the sun, thus generating more electricity. Look us up at << Link removed by Moderator >> We have a unit that generates 3,000+ ft lbs of torque. Strong, but only one slow rotation per day. Could this torque be used to directly generate electricity?? How much would we need to make this drive a generator?