Penrice Soda Holdings Ltd will report an after-tax loss for its fiscal first half due to an unexpected shutdown at the group’s Osborne soda ash plant in South Australia.Penrice, Australia’s sole producer of soda ash and sodium bicarbonate, will report an after-tax loss of A$1.2m. ($1.2m.) for the six months to 31 December 2010.The 285,000 tpa soda ash plant was forced to close in October due to a steam supply interruption, the company said.“The failure forced an unplanned shutdown of...