从光伏、核电到煤炭“全线起飞”，美股“AI供电”主题能持续多久？

Core Viewpoint - The surge in the U.S. power sector this year, driven by electricity supply shortages due to artificial intelligence data centers, has led to significant stock price increases across various segments, but with valuations now reflecting most optimistic expectations, investors are expected to focus on companies' actual execution capabilities in the coming year [1] Group 1: Overall Market Performance - The U.S. power sector has experienced a rare comprehensive increase this year, with significant gains across clean energy, coal, mature technologies, and speculative projects, primarily driven by supply shortages from AI data centers [1] - The renewable energy ETF in the U.S. has seen annual gains of 50%-60%, while nuclear and natural gas equipment manufacturers' stock prices have doubled, and fuel cell companies' stock prices have surged threefold [2] Group 2: Specific Sector Gains - Uranium miner Cameco has risen approximately 80%, while nuclear operator Constellation Energy has increased by about 60%, and speculative small modular reactor stocks like Oklo have more than doubled [2] - Equipment manufacturers have also performed strongly, with GE Vernova's stock price doubling, and Caterpillar and Cummins seeing increases of about 60% and 50%, respectively [2] - Coal stocks, including Peabody Energy, have risen about 50%, with the U.S. Energy Information Administration estimating a 9% increase in coal consumption this year compared to 2024 due to rising electricity demand [2] Group 3: Renewable Energy Recovery - The renewable energy sector started the year weakly due to subsidy cuts from the "Inflation Reduction Act," but began to recover in the summer as tax credit reductions and eligibility rules became clearer, leading to a "catch-up trade" driven by investor interest in AI-related electricity demand [3] Group 4: Valuation Concerns - Most power sector valuations have reached historical highs, indicating that further positive news is needed to drive stock prices higher, while negative news could lead to declines [7] - Companies directly associated with AI electricity demand, such as Constellation Energy, GE Vernova, and Cameco, have forward P/E ratios exceeding 30 times [7] - Fuel cell manufacturer Bloom Energy has a forward P/E ratio of 90 times, making it one of the most expensive in the energy sector [8] Group 5: Potential Risks and Supply Constraints - The supply shortage that has benefited energy stocks this year may turn into a disadvantage in the future, as engineering, procurement, and construction contractors face shortages due to commitments to data center and natural gas projects [10] - Companies with little to no revenue, such as small modular reactor startups Oklo and NuScale Power, are at higher risk of price corrections [9]