核聚变正在吸引快速增长的公共与私人资本。英国政府承诺在五年内投入25亿英镑，其中13亿英镑将首先用于开发名为 Step 的原型反应堆；全球私人投资已超过100亿美元。尽管聚变研究始于20世纪50年代，且商业化预测长期过度乐观，但当前资金规模表明，投资者正在押注这种模仿太阳与恒星反应的清洁能源开始接近现实。

关键技术门槛仍然极高，但进展已具有可量化的时间框架。研究人员正借助超级计算、AI 和实验反应堆，更好理解如何将等离子体维持在超过1.5亿摄氏度的条件下足够长时间，以支持氘氚聚变。文章判断，聚变发电在约15年内接入电网存在相当机会。最大公共项目 Iter 由33个国家合作建设，但比原始时间表晚了10年；实验现定于2034年开始，使用氘氚燃料发电定于2039年。

政府资金仍是基础，因为它为私人公司建立知识与经验平台。英国的 Step 计划于2030年开工，目标是在2040年投入运行。相比之下，行业预期明显更激进：根据 Fusion Industry Association，89%的私营公司相信聚变将在2030年代并网。统计趋势显示，资本正在接受聚变是高风险、高回报领域这一事实；虽然成功并无保证，但若其实现全天候、低碳、且不产生长寿命放射性废物的供电，潜在回报足以证明投入数百亿美元是合理的。

Nuclear fusion is drawing rapidly rising public and private capital. The UK government has pledged £2.5bn over five years, with an initial £1.3bn for a prototype reactor called Step; global private investment has already exceeded $10bn. Although fusion research began in the 1950s and commercial forecasts have long been overly optimistic, the current scale of funding shows that investors are betting this clean energy source, which replicates the reaction powering the Sun and stars, is moving closer to reality.

The technical barriers remain extreme, but progress now has a measurable time horizon. Researchers are using supercomputing, AI, and experimental reactors to better understand how to keep plasma above 150mn centigrade for long enough to sustain deuterium-tritium fusion. The article argues there is a fair chance that fusion power could reach electricity grids in about 15 years. The largest public project, Iter, is being built by 33 countries, but it is running 10 years late; experiments are now due in 2034, with deuterium-tritium energy generation scheduled for 2039.

Government funding remains foundational because it builds the knowledge and experience base for private companies. The UK’s Step project is due to start construction in 2030 and aims to open in 2040. By contrast, industry expectations are much more aggressive: according to the Fusion Industry Association, 89 per cent of private companies believe fusion will be on the grid in the 2030s. The statistical trend is that capital is accepting fusion as a high-risk, high-reward field; success is not guaranteed, but the potential payoff of round-the-clock, low-carbon power without long-lived radioactive waste is large enough to justify investment of many tens of billions of dollars.