What is Energy Security — and Why Does It Matter?

Test yourself on Energy Resource Management with exam style questions, marked instantly.

Flashcards that come back just before you would forget them.

A revision plan that remembers what you know and shows what to do next.

See which topics you have nailed and which need another look.

Quiz yourself on Energy Resource ManagementGet your flashcardsBuild my revision planTrack my progress

🔍 What is Energy Security — and Why Does It Matter?

Energy security means having reliable access to sufficient, affordable energy to meet a country's current and future needs. That sounds simple. In practice, it is one of the most complex geopolitical challenges on the planet.

Think about what energy actually powers. At an individual level: lighting, heating, cooking, transport. At a national level: hospitals, schools, factories, communications, water treatment, food refrigeration. Remove energy from any of these systems and societies begin to break down rapidly. This is why governments treat energy supply as a matter of national security, not just economics.

The Energy Mix

Every country uses a combination of energy sources — this is called its energy mix. No two countries have the same mix, because the mix is shaped by geology (what natural resources exist underground), geography (is it sunny? Windy? Mountainous with rivers for hydro?), history (when was the grid built, and with what technology?), politics (is nuclear power acceptable to the public?), and economics (what can the country afford?)

Norway — 98% of electricity from hydropower. Norway has dramatic mountain terrain, abundant rainfall, and fjords that are perfect for reservoirs. Its electricity is nearly carbon-free. But Norway also exports oil and gas from the North Sea — it is simultaneously one of the world's greenest electricity producers and a major fossil fuel exporter.
France — approximately 70% of electricity from nuclear power. France made a deliberate post-1970s political decision to build nuclear capacity to reduce oil dependence after the 1973 OPEC oil embargo caused economic crisis. Its electricity is low-carbon and relatively cheap, but France is now grappling with an ageing nuclear fleet that needs expensive replacement.
China — the world's largest producer of both coal and renewable energy. China burns more coal than the rest of the world combined, because coal powered its economic transformation. But China is also the world's largest investor in wind and solar and is building more renewable capacity than any other country. Its energy mix reflects its contradictions: rapidly growing wealth and rapidly growing emissions.
Nigeria — the 8th largest oil producer in the world, yet 40% of its population has no electricity. Nigeria has extraordinary energy resources but chronic problems of governance, infrastructure investment, and distribution. It is simultaneously energy-rich and energy-poor — a paradox we will explore in the case study below.
UK — approximately 40% renewables (mostly wind), 32% gas, 13% nuclear, rest other sources (2023). The UK has abundant offshore wind and is one of the world's leading wind energy producers. Yet for heating and transport, gas remains dominant — and 40% of that gas is imported, mostly from Norway, with some from Qatar.

Why Energy Insecurity is Dangerous

When a country cannot reliably access affordable energy, the consequences cascade through every part of society:

  • Geopolitical vulnerability — Germany's 55% dependence on Russian gas left it exposed to political manipulation. When Russia restricted supplies in 2022, Germany had no short-term alternative: it could not replace pipeline gas quickly enough and energy prices tripled. The lesson: dependence on a single supplier, especially a politically unreliable one, is a strategic weakness.
  • Economic cost — Energy price spikes ripple through every industry. When gas prices spiked in 2022, European fertiliser plants shut down (fertiliser is made using gas), threatening food production. Steel, aluminium, and ceramics manufacturers reduced output. The economic cost was estimated at hundreds of billions of euros across the EU.
  • Health impacts — the hidden catastrophe — In low-income countries, energy insecurity kills. Indoor air pollution from cooking fires (wood, charcoal, animal dung burned indoors) kills approximately 4 million people per year — more than malaria. Women and children who spend hours collecting firewood are exposed to danger and lose time for education and work. Without electricity for medical equipment and vaccine refrigeration, healthcare standards collapse.
  • Development trap — Access to energy and economic development are directly linked. Countries with reliable electricity grow faster. Businesses that must run diesel generators (because grid power is unreliable) add 40% to their operating costs — a crippling disadvantage in global competition. No country has industrialised without a reliable energy supply.

Make this stick

Signing in gives access to all PrepWise features.

PrepWise is a trading name of A3M Quality Solutions Limited, registered in England and Wales, company number 14959172. Registered office: 202 Stroud Road, Gloucester, GL1 5LA. ICO registration ZC267069.