Energy resources are the sources we use to generate electricity, heat homes, and power industry. They divide into two fundamental categories — renewable and non-renewable — and the choices countries make about their energy mix carry profound social, economic, environmental, and political consequences that geographers analyse using the SEEP framework.
What is the difference between renewable and non-renewable energy?
The most important distinction in energy geography is between resources that can be replenished naturally and those that cannot.
Non-renewable energy sources are finite: once used, they are gone. The three main fossil fuels — coal, oil, and natural gas — formed over hundreds of millions of years from the compressed remains of dead organisms. They currently supply around 80 per cent of global energy demand. Nuclear energy also uses a finite fuel (uranium) and is classified as non-renewable, though it produces very low carbon emissions.
Renewable energy sources are replenished naturally on a human timescale and do not run out through use. They include solar, wind, hydroelectric, tidal, wave, geothermal, and biomass energy.
The key distinction for KS3 is not just the timescale but the environmental impact: burning fossil fuels releases carbon dioxide and other greenhouse gases that drive climate change, whilst most renewables generate electricity without direct carbon emissions.
Why are fossil fuels a problem?
Fossil fuels power the modern world, but their use creates problems across the SEEP framework.
Environmental: Burning coal, oil, and gas releases carbon dioxide and methane — the primary drivers of global warming. Coal combustion also produces sulphur dioxide (causing acid rain) and fine particulates harmful to health.
Social: Air pollution from fossil fuels causes millions of premature deaths annually, with the burden falling disproportionately on lower-income communities near power stations and roads.
Economic: Fossil fuel prices are volatile. Countries dependent on imported gas are exposed to price spikes — the UK discovered this in 2022 when Russian gas supply disruptions caused wholesale prices to rise over 400 per cent.
Political: Control of oil and gas has driven geopolitical conflict throughout the twentieth and twenty-first centuries, from the 1973 OPEC oil embargo to the 2022 Ukraine conflict.
What are the main types of renewable energy?
| Type | How it works | UK suitability |
|---|---|---|
| Solar (photovoltaic) | Panels convert sunlight into electricity | Moderate — UK receives less sun than Mediterranean countries, but solar is viable at scale |
| Onshore wind | Turbines capture wind energy | High — the UK is one of the windiest countries in Europe |
| Offshore wind | Turbines mounted in the sea | Very high — the UK has the largest offshore wind capacity in the world |
| Hydroelectric | Flowing water drives turbines | Limited — requires large rivers and elevation changes; mainly viable in Scotland |
| Tidal | Sea tides drive turbines or lagoon generators | High potential — the UK has some of the largest tidal ranges in the world (Bristol Channel) |
| Geothermal | Heat from inside the Earth is extracted | Low in most of UK; some potential in Cornwall (hot granite rocks) |
| Biomass | Organic material is burned or converted to biogas | Controversial — can be renewable if managed sustainably, but land use is a major concern |
What is an energy mix and why does it matter?
No country relies on a single energy source. The energy mix is the combination of different energy sources used by a country to meet its total energy demand.
The energy mix a country chooses depends on:
- Physical geography — the availability of wind, sun, rivers, and fossil fuel reserves
- Level of economic development — richer countries can afford renewable infrastructure; poorer countries often rely on cheaper coal
- Technology — the falling cost of solar panels (down over 90 per cent since 2010, according to the International Renewable Energy Agency) has transformed what is economically viable
- Politics and policy — government decisions on subsidies, planning, and carbon pricing shape private investment
How has the UK's energy mix changed?
The UK's energy transition over the past two decades is one of the most dramatic in the developed world and a useful case study for KS3.
In 2012, coal provided around 40 per cent of UK electricity. By 2024, the UK had periods of zero coal generation for days at a time, and coal's share of electricity had fallen to under 1 per cent. In September 2024, the UK closed its last coal-fired power station (Ratcliffe-on-Soar), formally ending coal power generation.
Offshore wind has driven most of this transition. The UK's offshore wind capacity grew from virtually nothing in 2000 to over 14 gigawatts by 2024, making the UK the global leader in this technology. On windy days, wind energy can supply over 50 per cent of UK electricity demand.
This transition has reduced the UK's carbon emissions from electricity generation by over 70 per cent since 1990, demonstrating that economic decarbonisation is technically achievable.
What is energy security and why is it a geopolitical issue?
Energy security is a country's ability to access reliable, affordable energy. Countries that import fossil fuels are geopolitically dependent on the producers. The 1973 OPEC oil embargo — in which Arab states cut oil supplies to countries supporting Israel — caused fuel shortages and economic crises across the Western world, permanently changing how governments think about energy.
Domestic renewables reduce this dependency: the UK's offshore wind farms generate electricity without relying on foreign suppliers. However, renewable supply chains create new dependencies — solar panels and turbine components rely heavily on Chinese manufacturing, whilst lithium, cobalt, and rare earth elements for batteries are concentrated in a small number of countries.
What are the SEEP impacts of different energy choices?
Geographers assess energy decisions through four lenses:
- Social: Does the energy source create local air pollution? Does it create or destroy jobs? Is it affordable for all income groups? Are communities consulted about new wind farms or solar parks?
- Economic: What is the cost per unit of electricity? Does the investment stay in the local economy or leave as profit? Does it reduce or increase vulnerability to global price shocks?
- Environmental: What are the greenhouse gas emissions? What is the land or seabed footprint? Does construction affect biodiversity?
- Political: Does the energy source increase or reduce dependence on foreign governments? Is it supported or opposed by powerful lobby groups? Who benefits from the current energy system and who benefits from changing it?
Frequently asked questions
What is the difference between renewable and non-renewable energy?
Renewable energy comes from sources that are naturally replenished — such as wind, sunlight, and tides — and does not run out through use. Non-renewable energy comes from finite sources, chiefly fossil fuels (coal, oil, gas), which took millions of years to form and will eventually be exhausted. The other critical difference is that burning fossil fuels releases carbon dioxide that drives climate change, whilst most renewable sources generate electricity without direct carbon emissions.
Is nuclear energy renewable?
Nuclear energy is not classified as renewable because it relies on uranium, a finite mineral that must be mined. However, nuclear power produces very low carbon emissions during operation and provides reliable, large-scale baseload electricity that does not depend on weather conditions. Some geographers and policymakers argue it should be treated as a "low-carbon" rather than a "renewable" energy source — a distinction that matters for climate policy debates.
Why can't we just switch immediately to 100% renewable energy?
The main challenge is that wind and solar energy are intermittent — they only generate electricity when the wind blows or the sun shines. Without sufficient energy storage (batteries at grid scale, or hydrogen production), a grid powered entirely by renewables needs backup generation for calm, cloudy periods. Grid-scale storage technology is improving rapidly, but costs and capacity remain challenges. The UK's approach has been to retain gas power stations as backup whilst building out renewables as quickly as possible.
How does energy access vary globally?
Approximately 700 million people worldwide lacked access to electricity in 2022, the vast majority in sub-Saharan Africa and South Asia. Energy poverty — the inability to afford adequate modern energy — affects a further 2 billion people who depend on wood or charcoal for cooking. This creates a core tension in global sustainability debates: low-income countries argue they should be able to develop using cheap fossil fuels, as wealthy countries did, rather than be asked to finance more expensive low-carbon alternatives.
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