Australian energy supplier AGL Energy has rejected a sweetened A$9bn (€6.1bn) second takeover offer from a consortium led by Brookfield Asset Management.

The consortium, backed by Australian tech entrepreneur Mike Cannon-Brookes lifted their offer by 75 Australian cents per share to A$8.25 from their initial proposal of A$7.50 made a fortnight ago.

In a market update, the AGL board said it considered the revised unsolicited proposal still undervalued the company.

AGL Energy chairman Peter Botten said: β€œThe revised unsolicited proposal continues to ignore the opportunity that AGL Energy shareholders have through our proposed demerger to realise potential future value.

β€œIt also ignores the momentum we have recently seen in the business through our solid half-year result, strong progress on the demerger, strong interest in our Energy Transition Investment Partnership and the improvements we are seeing in forward wholesale prices.”

In a Twitter post, Cannon-Brookes, the co-founder of software developer Atlassian, said it was with great sadness that the consortium was β€œputting our pens down”.

β€œThis weekend, the board rejected our raised offer of A$8.25 – 46% more than the price of A$5.55 about 90 days ago,” he said.

The consortium’s proposal to spend between A$10bn and A$20bn in large-scale renewable energy and batteries to enable the early closures of AGL’s power stations that account for 8% of Australia’s overall greenhouse gas emissions β€œwould have been the world’s biggest decarbonisation project”, he added.

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