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Climate Tech

Green Steel is Coming to Disrupt and Decarbonize Metals

September 15, 2023
x min read
Green Steel is Coming to Disrupt and Decarbonize Metals

Boston Metal is making fossil fuel free steel. And some of the world’s largest venture capitalists are behind it.

What’s happening:

  • Boston Metal, a startup focused on decarbonizing steel, has raised $236M in a Series C round to build their first of its kind facilities
  • Notable investors in the round include the venture arm of Saudi Aramco, Breakthrough Energy Ventures, Microsoft’s Climate Innovation Fund and more

The big idea:

  • The innovation process developed by Boston Metal is called ‘molten oxide electrolysis’ which leverages renewable energy to convert crude iron ore into molten iron
  • The critical difference maker is this method of production avoids carbon dioxide emissions and does not generate any waste
  • This is a stark contrast to traditional steel production which relies on coal and generates enormous amounts of emissions

Going deeper:

  • Roughly two billion tons of steel are produced globally every year
  • The carbon emissions from steel production alone contribute to approximately 10% of all carbon emissions globally
  • Aside from steel production, Boston Metal has another innovative concept which is using their molten oxide electrolysis process to turn mining waste into an asset
  • Their subsidiary in Brazil is able to extract valuable metals from complex, low concentration materials that are currently considered waste
  • Metals recovery unlocks not only a potentially huge revenue stream for Boston Metal but could represent a paradigm shift for how mining companies handle their environmental responsibilities of dealing with waste


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