The reasons why many projects have been stopped
are considered to be on environmental change around
electric power business, economic circumstance or other,
which depends on conditions of each country. For developments of superconducting machines, many kinds
of technology and technical skills, that is, cryogenics,
154 T. Nitta / Cryogenics 42 (2002) 151–155
material, superconductivity, machinery, control, power
system engineering, and so on, are necessary. Furthermore, research organization, system, and management
are very important. From above point of view, Japanese
developments on superconductivity are very successful
and Japan is leading the world. It is expected that SCG
becomes superior to conventional generators from economical and performance points of view.