Nuclear power

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Nuclear power is the second-largest source of low-carbon electricity today, supplying 10.5% of global electricity

Nuclear power is generated by a controlled chain reaction inside a nuclear reactor, most commonly in a process called nuclear fission. In fission, neutrons collide with uranium or plutonium atoms, causing the atoms to split and release additional neutrons and energy in the form of heat. This heat is used to convert water into steam, which drives turbines to produce electricity. A nuclear reactor was first used to produce electricity in the 1950s, in light of discoveries made through research efforts previously focused on developing nuclear weaponry. A series of commercial reactors for electricity production have since been developed. Today, nuclear power is gaining importance driven by the climate change agenda since it emits minimal greenhouse gases, at levels similar to renewable energy in terms of total life cycle emissions per unit of energy generated. Nuclear power projects are heavily dependent on government policy due to their capital-intensive nature, and are strictly regulated as they deal with radioactive materials.

Nuclear power is controversial in some locations due to these radioactive materials and the potential health hazards they pose. A number of destructive accidents have occurred in the history of nuclear power; these include the Chernobyl disaster in the Soviet Union in 1986 and the Fukushima disaster in Japan in 2011. Different nations have widely different visions for the deployment of nuclear power, ranging from France’s 75% dependence on nuclear power for electricity generation to Germany having announced decision to shut down all of its nuclear power plants by 2022. Another important aspect is the disposal of nuclear waste; spent fuel remains active for tens of thousands of years and a proven long-term solution for safely managing and disposing of this radioactive waste is yet to be developed. Although newer, safer and more efficient reactor designs are being constructed today, nuclear power has an uncertain future challenged by public acceptance, costs, fuel resource sustainability and nuclear waste management.

As a potentially safer and less waste-generating type of reaction than fission, nuclear fusion is an ongoing area of research. Several experimental reactors exist, but commercial-scale results remain far from realisation. Small modular reactors are also attracting interest, as they allow for greater flexibility with potential benefits particularly for developing countries with limited grid capacity.

Learn more about nuclear power by reading our Energy Insights.

For the latest news and articles on the transport sector read New Energy World.

Read energy professional's thoughts on the future of nuclear in our Energy Barometer.

What's new?

UK eyes future of nuclear power with fuel cycle and fusion investments


First, it has announced a £196mn plan to develop a new nuclear fuel plant for advanced nuclear fission reactors. The high-assay low enriched uranium (...

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UK electricity networks accelerate grid connections of more than 200 energy projects


The Technical Limits programme is a collaborative project from National Grid Electricity Transmission, Energy Networks Association, the Electricity Sy...

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India sets new record for monthly renewables installation


The increase in installations helped India reach its highest-ever annual installed capacity of 18.5 GW for the fiscal year ending on 31 March 2024, th...

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US government offers Palisades nuclear plant $1.52bn loan guarantee to help fund restart


The project aims to bring back online the single-unit Combustion Engineering-designed pressurised water reactor and upgrade it to produce baseload pow...

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Blueprint to decarbonise the UK’s electricity grid published


The report outlines a plan to connect a further 21 GW of offshore wind in development off the coast of Scotland to the grid in ‘an efficient and coord...

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Events and training

Human Factors Foundation - November 2024

04/11/2024 - 08/11/2024

This 5-day course delivers a comprehensive introduction into human factors for non-specialists. It provides a practical, engaging and interactive back...

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Technical guidance publications

Guidance on quantified human reliability analysis (QHRA)


This document is free to download for all registered users of this site.EI Guidance on quantified human reliability analysis (QHRA) (second edition) p...

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Guidance on ensuring control room operator (CRO) competence


This publication is free to download for registered users.Control room operators (CROs) perform a critical role in running normal operations, infreque...

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Research report: Modelling toxic hazards of sour water releases – consolidated knowledge of sour water releases physics and chemistry


The EI's Process Safety Committee (PSC) has identified that many petroleum refinery and gas separation plant process operations generate aqueous solut...

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Engaging contractors: Partnership approaches to improving safety in the power industry


This publication was developed in response to demand from operators and contractors within the power generation sector, recognising that the safe and ...

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Research report: Achieving greater resilience to major events – Organisational learning for safety risk management in complex environments


This document is free to download for registered users.This report has been split into the following three sections:Part 1: Cultural precursors to maj...

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