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Although electric vehicles may have been the cleantech topic that dominated yesterday’s Super Bowl ads, fusion still seems to be the renewable energy du jour for private investors.

U.K.-based announced Monday it raised a $45 million Series C from , and , as well as new investors and .

The round comes less than a week after the laboratory in developing practical nuclear fusion and after investors poured money into the fusion sector late last year.

• In December, Cambridge, Massachusetts-based raised a huge Series B of more than $1.8 billion led by .
• One day earlier, British Columbia-based raised a $130 million Series E led by ​​ and included an investment by .
• In early November, Everett, Washington-based closed a $500 million Series E led by —with an opportunity for an additional $1.7 billion tied to reaching performance milestones

While fusion energy—created when two atoms are merged—has been talked about for a century, many feel that recent tech advancements in things like switches and modeling software have made commercializing fusion energy something that is years away and no longer decades.

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