The Victorian government is investigating an outage at the state's triple-zero emergency system. Photo: Joel Carrett/AAP PHOTOS

Victoria's triple-zero dispatch software is "hanging by a thread" after an unprecedented power outage exposed a long-standing flaw in the state's emergency system.

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Triple Zero Victoria's computer-aided dispatch system was plunged into darkness at 12.30am on Wednesday, forcing staff to take notes with pen and paper.

Emergency Services Minister Vicki Ward confirmed the system was not fully back online until 4am after a 90-minute power outage.

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