7.2.4—Country energy choices

A country's energy mix reflects its resource geography, infrastructure, policy and demand, so the same source can have different advantages in different places.

Criterion	China	Iceland
Availability	large coal reserves; imports some oil and gas; very large wind and solar capacity	abundant hydropower and geothermal resources
Cost and infrastructure	coal supports an established, industrial-scale system; transition requires major grid and generation investment	existing hydro and geothermal systems already supply most domestic energy outside transport
Pollution and sustainability	coal combustion produces major GHG and air-pollution pressure; renewables are expanding	renewable supply avoids most fossil combustion, while dams and geothermal plants still have local impacts
Efficiency and reliability	controllable coal output is reliable, while variable wind and solar require grid balancing and storage	geothermal can provide steady output and hydropower can respond to demand
Energy security	domestic coal reduces one import risk, but oil and gas imports create exposure	domestic renewable resources reduce fuel-import dependence, though transport remains a separate constraint

China's choices balance industrial demand, existing coal assets, pollution and rapid renewable expansion. Iceland's geology and water resources support a contrasting hydro-geothermal mix.

Compare both countries against the same criteria and timescale; a benefit under one criterion can create a cost under another.

There is no context-free 'best' energy source, and a national average can hide transport or local environmental impacts.