For example, a gas furnace must have at least a 95% efficiency rating to qualify for the credit.

FORBES: Energy Tax Breaks: About To Expire

"The efficiency and sustainability of the new furnace will also make a major contribution to our efforts to create an 'all-weather' company in Europe, " said Mr Kohler.

BBC: Wales

The old blast furnace was decommissioned in July last year before being completely rebuilt, incorporating the latest technology to improve energy efficiency, environmental performance, safety standards and capacity.

BBC: Tata Steel's ?185m Blast Furnace No 4 starts up