Steel giant Tata has announced that production has restarted at the second blast furnace at its Port Talbot site.
The project - which cost £185m - began after Blast Furnace No.4 was decommissioned in July 2012.
A Tata spokesperson said the work has made the furnace "more efficient", along with upgrading its capacity and environmental performance.
In November, Tata announced it would make 584 of its workers in Wales redundant, blaming high energy costs and a fall in global demand for steel.
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An Amber weather warning has been issued for Conwy, Denbighshire, Flintshire, Gwynedd, Isle of Anglesey, Powys, Wrexham and Ceredigion.
Storm Doris will bring a squally band of rain at first with disruptive gales, especially further north.
Winds will strengthen to gale force by dawn, these severe across exposed coasts and hills particularly in the southwest.