Abstract: A homeostatic heat trace powered by wind and solar electrical generators for preventing freeze-up of equipment at remote sites. A heat trace system wherein solar power may be used as backup when wind velocities are too low or high. A heat trace with a UPS backup for preventing freeze-up of equipment at remote sites during power failure. A homeostatic control system for maximizing the utilization of energy stored in a bank of batteries. A programmable logic controller with a homeostatic control system for maintaining battery charge. A homeostatic heat trace system powered by wind and backed up by solar power to prevent freeze-up of equipment at remote sites, including oil and gas wells.