The objective of the contract was to develop optimized preliminary designs of low power (50 to 500 KW) and high power (500 to 3000 KW) Wind Generator Systems (WGS) for electric utility applications. The low power system is designed for a utility site with a yearly median wind speed of 5.4 m/sec (12 mph) and the high power WGS is designed for a utility site with an 8 m/sec (18 mph) median wind speed. The preliminary designs prepared in the study are intended to provide the bases for follow-on programs which will involve the detail design, fabrication and experimental demonstration testing of these units at selected utility sites.