Nuclear stocks gained on Thursday. Oklo up 14.5%; NANO Nuclear Energy up 12.7%; NuScale Power up 9%; Vistra Energy up 8%; Centrus, Constellation Energy Corp up more than 3%.

The rally came after concerns emerged over the potential impact of Chinese AI start-up DeepSeek on the projected surge in U.S. electricity demand and tech spending. This surge in nuclear stocks was driven by investors re-evaluating the potential demand for electricity from data centers powering AI technologies.

Power producers were among the biggest winners in the S&P 500 last year, as expectations of ballooning demand from energy-intensive data centers to scale AI operations fueled optimism. However, the emergence of DeepSeek's new AI technology has cast doubt on these projections, leading investors to recalibrate their positions in the nuclear energy space.