A startup that makes giant iron-air batteries that store enough power to last several days has raised a new round of funding valued at $750 million.

Form Energy, which has now raised more than $2 billion in total, plans to use the money to boost manufacturing at its Weirton, WV, plant and for its first wave of commercial projects, including a project for the utility Xcel Energy in partnership with Google.

Read more in the Wall Street Journal here.

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