Investors are demanding answers on what happens if the AGL Energy demerger vote fails, wanting the giant electricity supplier’s new biggest shareholder, Mike Cannon-Brookes, to spell out his intentions more fully.

With less than six weeks before the shareholder vote on the split of AGL into coal power-focused Accel Energy and retailer AGL Australia, analysts and investors are seeking more detail on the plans of Mr Cannon-Brookes, who emerged on Monday with an 11.27 per cent holding and declared his intention to ensure the demerger is blocked.