 Concerns have been raised about the environmental performance of Solid Energy particularly at the Stockton Mine on the West Coast.In 2006, the Parliamentary Commissioner for the Environment proposed to undertake a review of the environmental performance of the company in 2008.Solid Energy has also been criticised by the Ngawakau Riverwatch group and environmental groups and organisations such as Greenpeace, Forest and Bird, The Buller Conservation Group and the Save Happy Valley Coalition.