Three types of 70 MW class superconducting generators called modelmachines have been developed to establish basic technologies for a pilotmachine. The series of on-site verification tests was completed in June 1999.The world's highest generator output (79 MW), the world's longest continuousoperation (1500 hours) and other excellent results were obtained. The modelmachine was connected to a commercial power grid and fundamental data werecollected for future utilization. It is expected that fundamental technologieson design and manufacture required for a 200 MW class pilot machine areestablished.