The process to restart the additional capacity, idled since 2009 and totaling 35,000 tonnes per year, will begin immediately, the United States-headquartered Alcoa Corp producer said.  The Portland Aluminium smelter is an unincorporated joint venture with 358,000 tpy of total capacity of which Alcoa has 197,000 tpy of consolidated capacity. Once the restart is complete, Portland Aluminium will be operating at approximately 95% of total capacity and Alcoa will have approximately 186,000 tpy of its consolidated capacity at Portland.