Nuclear energy: Status and future limitations
Michael Dittmar
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In one page
Michael Dittmar is a particle physicist at ETH Zurich who works at CERN, and he spent several years reading the nuclear industry’s own books — the IAEA and OECD Red Book, the World Nuclear Association, the International Energy Agency — to answer a plain question. How much of the world’s energy does nuclear fission actually supply, and what would it take to supply more? His answer here is that fission makes about fourteen per cent of the world’s electricity, that electricity is itself only about sixteen per cent of the energy people finally use, and so nuclear’s share of the whole is small. He then sets out what he counts as unsolved. Reactors cannot follow demand, so they run flat out even when nobody wants the power, and a grid leaning on them needs storage behind it. The highly radioactive waste has had no final store for forty years. Uranium is finite. His conclusion is blunt: fission as it is built today is part of the energy problem rather than the answer to it.
Why it matters hereChapter 1 is about how to score a programme by its unsolved engineering rather than by its press releases, and this is that method applied to the largest energy programme humanity has ever run. Chapter 12 has to answer Dittmar directly, because his sharpest paragraph is about fusion timelines — and the answer the site is built on is that the architecture he audits, the deuterium-tritium tokamak fuel cycle, is not the only architecture on the table.
What it claims
01Nuclear fission contributes only about fourteen per cent of the world’s electric energy mix, and electric energy is itself only about sixteen per cent of end energy use, so on Dittmar’s reading the contribution of nuclear fission to the total energy people actually consume is essentially negligible — a little over two per cent.Abstract, second sentence; the arithmetic is set out in the companion preprint, Chapter I, Summary Part I
Published and peer-reviewed02The least-known limitation is an operational one. Nuclear plants cannot provide power according to need: they have to be operated at full power also during times of low demand, so regions with a large nuclear contribution need backup hydropower storage systems to absorb what the fleet produces anyway.Abstract, third sentence
Published and peer-reviewed03Two better-known problems have gone without a solution for at least forty years, in Dittmar’s account: the final safe storage of the accumulated highly radioactive waste, and the fact that uranium itself is a very limited and non-renewable energy resource.Abstract, fourth sentence
Published and peer-reviewed04The fuel arithmetic is where the limitation bites first. Operating the roughly 370 gigawatts of electrical capacity then installed requires about 65,000 tonnes of natural-uranium equivalent a year, while over the preceding decade the world’s mines produced on average about 40,000 tonnes a year, the difference being made up from secondary stocks — civil and military stockpiles and reprocessed material — which the Red Book 2007 and the World Nuclear Association data indicated would be essentially exhausted within a few years.Companion preprint, Chapter I, Summary Part I, arXiv 0908.0627v1
Published and peer-reviewed05The build rate is tested against the retirement rate, which is the test a renaissance has to pass. In 2009, 48 reactors totalling about 40 gigawatts of electrical capacity were under construction, only about a tenth of them in the OECD countries that host about 85 per cent of the existing fleet, while roughly a hundred older reactors of slightly larger combined capacity were reaching retirement age over the same period.Companion preprint, Chapter I, Summary Part I, arXiv 0908.0627v1
Published and peer-reviewed06What to watch: Dittmar’s hardest paragraph is about fusion, and he states it as a claim about people rather than plasma — that enormous amounts of human resources, which he argues are urgently needed to find a still unknown path to a low-energy future, are blocked by what he calls useless research on fusion energy; in the companion chapter he puts it as commercial fusion power being not fifty years away but always fifty years away. He is auditing one architecture, the deuterium-tritium tokamak with its lithium breeding blanket, and the measurements that would answer him are named in his own Fusion Illusions chapter: a machine that breeds more tritium than it burns, and a first wall that survives fourteen-million-electronvolt neutrons for years.Abstract, fifth sentence, and the companion preprint, Chapter IV, Summary, arXiv 0911.2628v1
What to watch
The way in
https://doi.org/10.1016/j.energy.2011.05.040LICENCE. Published as Energy volume 37, issue 1, pages 35 to 40, January 2012, accepted 2011. Crossref carries only Elsevier’s text-and-data-mining licence; Unpaywall, OpenAlex and OpenAIRE all report the article closed with no repository copy, and no Creative Commons statement exists — checked 2026-09-08. The publisher’s pages decline automated retrieval, so no text is reproduced here and everything on this page is the site’s own summary and claims. WHAT WAS READ. Two things. First, the author’s own abstract for this article, which is public in full in the OpenAIRE record and was read there on 2026-09-08; claims one to three carry locators naming a sentence of it. Second, the open preprint series this paper condenses — Michael Dittmar, ‘The Future of Nuclear Energy: Facts and Fiction’, arXiv:0908.0627 (Chapter I, Nuclear Fission Energy Today), arXiv:0908.3075 (Chapter II, secondary uranium resources), arXiv:0909.1421 (Chapter III, the Red Book resource data) and arXiv:0911.2628 (Chapter IV, breeder reactors and fusion). Chapters I and IV were downloaded and read in full for this sheet, and the four abstracts were read for all of them; claims four to six carry locators naming a chapter and section of that series. The preprints are distributed under the arXiv non-exclusive licence, which is not a Creative Commons grant, so they too are linked rather than quoted. AUTHOR. Michael Dittmar, Institute of Particle Physics, ETH Zurich, working at CERN. HOW THIS PAGE READS IT. The site reports the argument faithfully and treats each limitation as a live engineering target with a named measurement attached; the closing cross-links say where the rest of the debate lives on this site.
How to cite it
Michael Dittmar (2012) Nuclear energy: Status and future limitations. doi:10.1016/j.energy.2011.05.040
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