This paper describes the electrical system designed for the Nuclear Power Demonstration (NPD) Generating Station and the statistical approach used to make decisions as the design progressed. NPD is a 22-mw (megawatt) nulcear power station designed by Canadian General Electric Company in co-operation with Atomic Energy of Canada, Ltd., and The Hydro Electric Power Commission of Ontario (HEPC). The reactor is heavy-water-moderated and heavy-water-cooled and uses natural uranium as the fuel. The plant is located on the Ottawa River about 1 mile downstream from the Ontario Hydro's Des Joachims generating station. An electrical system was designed for NPD which is quite similar to that which would be found in a conventional generating station of the same rating. However, because of the critical nature of some of the processes during all phases of operation including shutdown, a great deal of emphasis was placed on reliability. Throughout the design, circuit configuration and equipment selection stressed reliability as well as cost.