Norwegian aluminium and renewable energy firm Norsk Hydro ASA reported on Thursday that it expects total impairment losses of around 5.9 billion Norwegian kroner ($571 million) in its fourth quarter. The charges come amid challenging alumina market conditions and Australian power price insecurity. Hydro said it will write down the value of goodwill in Bauxite & Alumina(B&A), Brazil; property, plant and equipment related to the Alunorte alumina refinery and Paragominas bauxite mine; deferred tax assets in Alunorte; as well as property, plants and equipment related to the Tomago aluminium plant,…