X-Energy Secures $700 Million to Accelerate Advanced Nuclear Reactor Deployment

Nuclear startup X-energy has raised $700 million in fresh funding. The massive Series D round was announced on November 24, 2025. This investment will fuel the company’s ambitious plans to build a supply chain for its small modular reactors (SMRs).This new capital injection comes less than a year after the company expanded its Series C round. According to TechCrunch, X-energy has now secured $1.4 billion in just over a year. The company’s total funding to date stands at an impressive $1.8 billion.

A Surge in Demand for Advanced Nuclear Power

X-energy is capitalizing on a wave of interest from major corporations. The company reports it has orders for 144 of its small modular reactors. These orders represent a potential 11 gigawatts of electricity generation capacity.Key customers include corporate giants like Amazon and Dow. British energy company Centrica is also a client. This broad demand highlights the growing corporate push for reliable, carbon-free power.

X-Energy’s Pebble Bed Reactor Technology

The company is developing a specific type of advanced nuclear reactor. Its Xe-100 design is a high-temperature, gas-cooled reactor. This technology has seen recent use in countries like Japan and China.Each reactor can generate 80 megawatts of electricity. They are fueled by unique, billiard ball-sized pebbles. These carbon-coated pebbles contain uranium particles and are cooled by helium gas.Amazon’s Climate Pledge Fund previously led an earlier funding round for the startup. The tech giant also plans to buy over 600 megawatts of nuclear capacity from X-energy. This deal could eventually expand to 5 gigawatts by the end of the next decade.X-energy faces competition from other SMR developers. The race is on to build the first operational small modular reactor in the United States. Success would mark a significant revival for the American nuclear industry.

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This latest funding round underscores the immense financial and corporate backing flowing into advanced nuclear technology. The substantial investment in X-energy signals a strong vote of confidence for a carbon-free energy future.

Info at your fingertips

What is a small modular reactor (SMR)?

SMRs are advanced nuclear reactors with a smaller power output than traditional plants. They are designed to be factory-built and then transported to a site for installation. This approach can reduce both cost and construction time.

How does X-energy’s reactor technology work?

The Xe-100 reactor uses helium gas to transfer heat from nuclear fuel. The fuel consists of uranium particles encased in carbon pebbles. This heat is then used to generate electricity through a steam turbine.

Who are X-energy’s main customers?

Major customers include Amazon, the chemical company Dow, and Centrica. Amazon alone has a deal for up to 5 gigawatts of capacity. These partnerships are primarily to power data centers and industrial facilities.

When will these reactors be operational?

The first reactors are projected to come online in the early 2030s. The full build-out for large orders like Amazon’s could extend to 2039. This timeline depends on regulatory approval and supply chain development.

Why is there so much investor interest in nuclear power now?

Investors are targeting reliable, 24/7 carbon-free energy to meet climate goals. Data center operators and tech companies are driving demand for clean, baseload power. Advanced nuclear designs promise enhanced safety and lower costs.