Washington-based clean energy firm Helion raised $500 million in a Series E funding round, a press statement reveals. According to the company, the money will go towards developing a "new era of plentiful, zero-carbon electricity from fusion."

Helion says its seventh-gen fusion reactor prototype, called Polaris, will be the world's first fusion generator to demonstrate net electricity production, and that it will do so as soon as 2024.

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