Nuclear startup X-energy raised $700 million in a Series D found, the company told TechCrunch.

The new fundraise comes less than a year after it expanded its Series C from $500 million to $700 million, bringing the total raised in the last year or so to $1.4 billion, a sizable amount even in the heady world of nuclear power startups. X-energy has raised $1.8 billion, to date.

X-energy said the new infusion will help build the supply chain for its small modular reactors (SMR). So far, the startup says it has orders for 144 SMRs capable of generating 11 gigawatts of electricity. Customers include Amazon, Dow, and British energy company Centrica.

The new round was led by Jane Street, which joined as an investor in the expanded Series C. Other investors participating include Ares Managemen

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