Four nuclear power stocks rallied on AI data center power demand tailwinds through 2027 and beyond.

The electricity demand from artificial intelligence has created an immense power problem, and nuclear energy has emerged as one of the best solutions. Hyperscalers require constant, carbon-free electricity to operate their data centers, and nuclear developers and providers are now among the most important AI infrastructure stocks.

**Oklo** (NYSE: OKLO) is one of the most discussed pure-play small modular reactor (SMR) developers. Though technically pre-revenue, the company has multiple agreements in its pipeline, including a 1.2-gigawatt system for Meta Platforms in Ohio. Oklo has also acquired Atomic Alchemy, a radioisotope producer, to expand its capabilities beyond selling SMRs. The stock surged in 2025 on enthusiasm for SMRs and nuclear's role in the AI renaissance but has since pulled back dramatically, declining more than 35% over the past 12 months—creating a more appealing entry point for opportunistic investors. The company is not expected to produce significant revenue until the end of 2027 or 2028. While Oklo has promising technology, it remains largely unproven and requires full approval from the Nuclear Regulatory Commission. This stock is best suited for investors with higher risk tolerances and an appetite for near- and intermediate-term volatility.

**Constellation Energy** (NASDAQ: CEG) occupies the opposite end of the risk spectrum. It is already the largest owner and operator of nuclear generation in the U.S. and has long-term power purchase agreements in place with hyperscalers such as Meta and Microsoft. Constellation acquired Calpine earlier this year for $26.6 billion, doubling its footprint to approximately 55 gigawatts and further positioning the company to capture AI-related demand. Though trading at a premium reflecting its sector leadership, Constellation carries far less risk than smaller companies like Oklo. The stock appeals to both income and growth investors, paying $1.70 per share annually with a consistently growing dividend.

**Vistra** (NYSE: VST) also holds long-term power purchase agreements with hyperscalers and operates a diversified business spanning nuclear, natural gas, and retail electricity. Second-quarter results missed analyst expectations, yet the company posted 30% growth in Ongoing Operations Adjusted EBITDA compared with the prior year and reaffirmed its fiscal-year guidance. Vistra plans to acquire Cogentrix by year's end, substantially expanding its natural gas fleet; the acquisition recently received approval from the Federal Energy Regulatory Commission. The stock has fallen more than 25% over the past 12 months but pays a reasonable quarterly dividend of $0.23 per share. Its expanding footprint and reasonable valuation make it a solid buy in the energy sector.

**Cameco** (NYSE: CCJ) plays a distinct role by supplying uranium to nuclear operators. The Canada-based company holds long-term contracts to deliver approximately 230 million pounds of uranium through 2030 and owns a 49% stake in Westinghouse, a reactor-services giant. Cameco is the second-largest uranium miner globally, having mined 15% of all uranium in 2025. Though momentum has pushed the stock to an incredibly high valuation, the company recently missed expectations. Cameco trades at a premium, and investors should maintain a longer time horizon to benefit from sustained high nuclear demand. The company pays a modest dividend of approximately $0.18 per share in U.S. dollars. While not as exciting a growth prospect as some peers, Cameco's role in the industry is crucial.

These four companies are positioned to capitalize on AI's insatiable power requirements. Nuclear must play a significant part in meeting energy demand, and each company fills a different yet crucially important role. While Oklo is the most speculative, each offers upside potential and reasons for long-term investors to be optimistic.