 The Davenport–Belalie line tripped with one phase to ground, was automatically reset, but tripped again nine seconds later, so was isolated for manual inspection, with the fault estimated to be from Davenport.One second later (7 seconds before the state went dark), the Hallett Wind Farm reduced output by 123 MW.Four seconds later, a third 275 kV transmission line showed a fault, the Davenport–Mount Lock is on the other side of the same towers as Davenport–Belalie, and the fault was estimated to be further on.