The solar water heating and medical products distributor has nose-dived by around 60 per cent after hitting a near-six-year high of 41¢ in early August. The trigger was fear over adverse changes to government cash incentives for renewable technologies and the issuing and sale of renewable certificates that energy retailers are required to buy. This is expected to impact on Quantum's sales following its stellar 2008-09, when it swung to a $30.3 million net profit from a loss of $7.7 million the year before as revenue surged 273 per cent to $106.1 million. The stock will likely remain volatile as Quantum and other renewable energy companies lobby the government to correct the supply-demand imbalances for the certificates. Until there is greater certainty on this front, the market is unlikely to re-rate the stock.