But this portion could grow, given the hassles of making hydrogen:It requires a six-story furnace, called a steam-methane reformer, where natural gas combines with steam and nickel at 1, 600 degrees Fahrenheit to unleash hydrogen gas.

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But the new furnace means production capacity at Port Talbot will double to make it capable of making more than four million tonnes of steel a year.

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Joseph, making it the biggest recycler of scrap in the nation, using 20 million tons a year as furnace feedstock.

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