AGL has rejected a sweetened takeover bid from a consortium led by Australian billionaire Mike Cannon-Brookes and will run with its own demerger and decarbonisation plans.
Mr Cannon-Brookes used Twitter on Sunday night to announce it would not proceed with plans to buy Australia's biggest electricity generator and largest emitter.
"The Brookfield-Grok consortium looking to take private & transform AGL is putting our pens down - with great sadness," he tweeted.