Northern States Power (NSP) and Zond Corp on September 6 signed the power purchase agreement for 100 MW of wind on Buffalo Ridge in Minnesota -- the Midwest's largest on-going wind development. Work on this Phase II is to start in the spring and the wind farm -- America's largest -- will be on line by 1998, says NSP's Mary Heimstead. The contract had been delayed because of disputes with Kenetech over wind rights on Buffalo Ridge and over the selection of Zond in June 1995 after a competitive bid. Phase I was built by Kenetech. Phase II was originally to have started full service by November 1, 1996. The contract signing with Zond does, however, meet the legal deadline that NSP must have the next 100 MW contracted this year. A request for proposals for the third phase of wind development in Minnesota by NSP is expected this month, says NSP's Gaye Jaenchen. Phase III is currently being considered by the state Public Utilities Commission. It would bring total wind under development by NSP to 225 MW.