Physical factors determining the supply of energy

The supply of energy is fundamentally shaped by physical factors, including geology, climate, and geography. Geology determines the availability of fossil fuels like coal, oil, and natural gas, as well as uranium for nuclear power. For example, the UK's North Sea oil and gas reserves are trapped in porous sedimentary rocks, while coal seams are found in Carboniferous strata. Climate influences renewable energy potential: solar power requires high insolation, wind power needs consistent strong winds, and hydropower depends on reliable precipitation and relief. Geography affects accessibility and transport costs; remote or mountainous regions may have high potential but low exploitation due to infrastructure challenges.

Understanding these physical factors is crucial because they dictate a country's energy mix and its vulnerability to price volatility or supply disruptions. For instance, Iceland's volcanic geology provides abundant geothermal energy, while Saudi Arabia's vast oil fields shape its economy. In the UK, the shift from coal to renewables is partly driven by physical constraints—coal reserves are depleting, while wind and tidal resources are abundant. This topic also links to energy security, climate change policy, and sustainable development, making it central to A-Level Geography.

Physical factors interact with human factors (technology, economics, politics) to determine energy supply. For example, fracking has unlocked shale gas in the US, but its viability depends on geological conditions and water availability. Students should appreciate that physical factors are not deterministic; they create opportunities and constraints that societies respond to. This topic is assessed through case studies, such as the UK's energy transition or the development of solar power in the Sahara, requiring application of concepts to real-world contexts.