Origin Energy (ASX:ORG) shareholder VanEck Australia will support the $10.5 billion bid from Canada's Brookfield and EIG.

Jamie Hannah, VanEck's deputy head of investments, called the $9.53 per-share offer a "good premium" in light of uncertainties around Origin's transition to renewable energy.

While some shareholders advocate for a higher premium, Hannah believes the current offer is favourable, and failure to secure the deal may impact Origin's stock price.

However, he acknowledges that the deal might face challenges, especially with opposition from AustralianSuper, the largest pension fund in Australia, which has publicly campaigned against the perceived undervaluation of Origin.