The Globe and Mail reports in its Wednesday edition that Origin Energy's largest shareholder said on Tuesday it plans to vote against a Brookfield Asset Management-led consortium's $15.35-billion (Australian) (around $13.5-billion) takeover offer for the company, casting doubt on the bid's future weeks ahead of a shareholder vote on the deal. A Reuters dispatch to The Globe says that AustralianSuper, the country's largest pension fund, owns a 13.68-per-cent share of Origin Energy and said the consortium's offer was "substantially below" its estimate of long-term value for Australia's biggest energy retailer. The $300-billion (Australian) pension fund said the assumptions used in the independent expert's report created an "unrealistically low" valuation, including on its stakes in British renewable energy group Octopus and Australia Pacific LNG, with valuation multiples well below recent relevant deals. The deal requires 75-per-cent support from the votes cast at a shareholder meeting, scheduled for Nov. 23, meaning AustralianSuper's holding could be enough to scupper the bid if not all shareholders vote. AustralianSuper is not alone. In September, fund manager Perpetual told local media the deal undervalued Origin.