The objectives of the test program were: 1. To monitor the performance of the system as a whole and of each subsystem, i.e. production well and pump, binary machine and cooling ponds. 2. Perform energy balance calculations and to compare the results with predictions of a computer program. 3. Provide TAD’s Enterprises with suggestions for improving the performance of the total system or subsystems, particularly the spray cooling pond. 4. Provide operational data that could be of value in future binary power generation installations