There will be no tours of the Gavins Point Power plant near Yankton, S.D., on Friday, August 30. The tour schedule for Saturday, Aug. 31 and Sunday, Sept. 1 will be every hour from 10 a.m. to 5 p.m. (except noon). Tours on Labor Day, Monday, Sept. 2, will be at 10 a.m., 11 a.m. and 1, 2, and 3 p.m. Tours for school and civic groups can be scheduled September through May by calling 402-667-2546.