Every year, the International Atomic Energy Agency (IAEA) releases its updated projections for nuclear power, often sparking debate. But these numbers are widely misunderstood. They are not a prediction of a single, fixed future, but a range of possibilities.
The Latest Projections
In its most recent annual report released in September 2026, the IAEA once again raised its outlook for nuclear energy, marking the sixth consecutive year of upward revisions. The report, which now extends to 2060, presents two main scenarios. The 'high case' projects that global nuclear capacity could reach 1,284 gigawatts (GWe) by 2060, roughly 3.4 times the level at the end of 2025. Conversely, the 'low case' sees a more modest, though still significant, rise to 696 GWe. These figures, especially the ambitious high case, attract significant attention as indicators of nuclear power's potential role in the global energy transition. For the first time, the projections also highlight a major role for Small Modular Reactors (SMRs), which could account for nearly 30% of new capacity in the high case scenario.
Forecast vs. Target: A Crucial Difference
This is where the core misunderstanding lies. An energy forecast, like the IAEA's projections, is an evidence-based estimate of what might happen under specific conditions. It uses historical data, current policies, market trends, and technological developments to model a range of potential outcomes. Think of it as a weather forecast: it tells you what is likely to happen based on existing atmospheric conditions, not what the weather has been ordered to do. A target, on the other hand, is an aspirational goal set by a government or organization. For example, the pledge by over 20 countries at COP28 to triple nuclear capacity by 2050 is a target. It is a statement of intent, designed to drive policy and investment. The IAEA's projections might show a pathway to that target, but they are not the target itself.
How the IAEA Builds Its Scenarios
The IAEA’s projections are not simply pulled from thin air. They are built using a detailed 'bottom-up' methodology. Experts analyse country-by-country data, considering all operating reactors, planned shutdowns, potential lifetime extensions, and construction projects deemed plausible. The 'low case' generally assumes a continuation of existing market and policy trends with few significant changes. The 'high case' is more optimistic, factoring in the stated national ambitions and policies aimed at combating climate change or enhancing energy security. Therefore, the projections are a reflection of current realities and stated political intentions, aggregated to a global level. They illustrate what is possible if certain conditions are met, from a 'business-as-usual' continuation to an accelerated push for decarbonization.
Why Projections Change
The fact that the IAEA has revised its projections upwards for six straight years demonstrates that forecasts are dynamic, not static. The initial upward revision in 2021 was the first since the 2011 Fukushima Daiichi accident, reflecting a renewed global interest in nuclear power amid rising climate concerns. This growing consensus that nuclear energy is a vital tool for a clean energy future has influenced national policies, which in turn feeds back into the IAEA's models. Factors like the global energy crisis, commitments made at climate conferences like COP28, and technological advancements in areas like SMRs all cause these projections to evolve. They are a snapshot in time, offering a plausible range of futures based on the information available today.
What This Means for Energy Policy
Understanding the distinction between a forecast and a target is vital for policymakers, investors, and the public. Treating a high_case forecast as a guaranteed outcome can lead to poor decisions. For instance,' it could create complacency,' assuming the growth will happen automatically without the necessary policy support and financial investment.' The IAEA itself notes that reaching its high_case scenario requires significant action,' including supportive government policies and massive investment—potentially over USD $1$ $2$ $5$ billion annually.' These projections are not a passive prediction of the future;' they are a tool.' They help stakeholders understand the scale of the challenge and the opportunity,' providing a data_driven basis for the ambitious targets needed to transition to a low_carbon global economy.
