Global Energy: Surplus, Deficit & Insecurity
Energy: Why Demand Keeps Rising
Global energy use has roughly doubled since 1980 and shows no sign of stopping. Three main drivers explain why. Economic development raises living standards: as countries industrialise, factories, transport and air conditioning consume more power. Rising population simply means more people to feed, light and move — the world reached 8 billion in 2022 and is forecast to reach over 9.5 billion by 2050. Technology creates new demand: data centres for streaming and AI, electric vehicles and bigger fridges all consume more electricity than the equipment they replace.
Three drivers of rising global energy demand: economic development (industrialisation in China and India), population growth (world reached 8 billion in 2022), and technology (data centres, electric vehicles and air conditioning). Together they push demand upward by roughly 1–2% a year.
Where Energy Is — and Where It Is Used
Energy supply does not match demand. The wealthy regions of North America, Europe, the Gulf and East Asia consume the most energy per person, while sub-Saharan Africa and parts of South Asia use the least. Yet many of the largest reserves sit in countries that consume relatively little: roughly 50% of the world’s known oil reserves lie in the Middle East, while Russia, Qatar and the United States hold the largest natural gas reserves. This mismatch creates global trade in energy — oil tankers crossing the Indian Ocean, gas pipelines crossing Eurasia, electricity flowing across European interconnectors.
A typical American consumes around 75 megawatt-hours of energy a year — roughly ten times the figure for a typical Indian and a hundred times that of someone living in rural Ethiopia. As poorer regions develop, their per-person demand will rise sharply, even if total population growth slows. Climate-policy debates often centre on whether richer countries should reduce their high consumption while emerging economies catch up.
Surplus, Deficit and Energy Security
Geographers describe countries as having an energy surplus when they produce more than they use, or an energy deficit when they produce less. Saudi Arabia, Russia, Norway and Qatar are surplus countries that export oil and gas. Japan, the UK and Germany are deficit countries that depend on imports. Energy security is the goal: enough energy, reliably available, at a price an economy can afford.
Factors Affecting Energy Supply
Energy supply is shaped by several factors:
- Physical: climate (sun for solar, wind speeds), geology (oil and gas formations, suitable rivers for hydro), and the existence of reserves (Saudi oil, Norwegian gas, Icelandic geothermal).
- Cost of exploitation: oil from shallow Gulf wells is cheap to extract; deep-water Atlantic oil and Canadian tar sands cost two to three times as much per barrel.
- Technology: hydraulic fracturing (‘fracking’) unlocked US shale gas; modern wind turbines have made offshore wind cheaper than gas in the UK.
- Political factors: wars and sanctions (the 2022 invasion of Ukraine cut Russian gas to Europe), nationalisation of resources (Venezuela), or political alliances (the OPEC group of oil-exporting countries) can rapidly change supply.
Consequences of Energy Insecurity
When supply does not meet demand, the consequences ripple through whole economies and ecosystems. Five impacts are commonly listed:
- Exploration of difficult areas: insecurity drives drilling into the Arctic, the deep Atlantic and tar sands — risky, expensive and damaging to fragile ecosystems.
- Economic costs: when fuel is short, prices spike. UK gas prices in 2022 reached over five times their 2020 level, raising costs for households and factories alike.
- Environmental costs: turning to alternatives like coal, lignite or burning wood imports raises air pollution and greenhouse-gas emissions.
- Food production: modern farming depends on fertilisers, irrigation pumps and refrigeration. Energy shocks raise food prices — the 2022 spike pushed up bread, milk and meat costs across Europe.
- Industrial output: factories close or cut hours when energy is rationed. UK steelworks, ceramics and chemical plants warned of closures during the 2022–23 gas crisis.
In some cases, severe insecurity drives conflict between countries over disputed pipelines, oil fields or electricity infrastructure.
Before 2022, Europe imported around 40% of its natural gas from Russia. After Russia’s invasion of Ukraine, the EU committed to cutting Russian gas drastically, while sanctions and pipeline sabotage (Nord Stream) cut flow further. Wholesale gas prices in Europe rose more than fivefold in 2022, fuel poverty surged, and governments rushed to find alternative supplies (US LNG, Norwegian pipelines, Qatari gas) and to accelerate renewable-energy roll-out. The crisis showed how quickly energy security can be rewritten by political events.
Energy insecurity drives rising prices for households, slowing factories, falling food output, exploration in fragile regions like the Arctic and, in extreme cases, conflict between rival states.
Why This Matters
Global energy use sits at the heart of three of the biggest stories of the 21st century: climate change, geopolitical conflict, and the rise of electric and digital economies. Understanding why demand is rising, where supply sits and what insecurity does to people prepares you for the final lesson, which moves from the global picture to a single small-scale renewable scheme that shows what a low-carbon energy future can look like.