 The companies AGL Energy, Neoen, Pacific Hydro and Tilt Renewables operated several of the large wind farms that tripped during the incident including Hallett, Hornsdale, Clements Gap and Snowtown.As so much of the network had been shut down, the authorities needed to act carefully to bring it back online and provide a stable network.This was initiated in the first few hours following the start of the outage, initially using the Victorian interconnectors to establish a stable frequency on the network, and gradually add South Australia's power generators to the network and restore power to areas as soon as possible.