Advantages of Coal

Why coal worked — an honest list

Coal still supplies roughly a third of global electricity. Understanding why it won in the past helps explain why the transition to cleaner sources is hard, and what cleaner alternatives need to deliver to replace it. The list below is descriptive, not prescriptive.

• 1. High energy densityOne kilogram of coal contains roughly 24–30 megajoules of chemical energy. Per cubic metre, coal stores more energy than nearly any battery technology.
• 2. Storable and transportableCoal can be stockpiled for years without degradation. Trains, ships, and trucks can move it almost anywhere. Stockpiles smooth out supply disruptions.
• 3. Dispatchable baseloadCoal plants run continuously at high output. They do not depend on weather. This was historically very valuable for grid stability.
• 4. Widely distributed reservesCoal is found in many countries — the US, China, India, Russia, Australia, South Africa, Indonesia, Germany. This contributed to energy independence in many economies.
• 5. Low fuel costOnce mining infrastructure is built, the cost per tonne of thermal coal is relatively low compared to oil or gas.
• 6. Mature technologyCoal-fired generation has been refined for over a century. Plant design, operation, and maintenance are well-understood.
• 7. Established supply chainsMining, transport, milling, plant operation, ash handling — all are mature, well-financed, and globally connected.
• 8. Co-product valueBy-products like fly ash and bottom ash have established uses in cement, concrete, and structural fill.

Why those advantages no longer win

Most of the original arguments for coal — baseload, fuel cost, dispatchability — can now be matched or beaten by combinations of solar, wind, storage, and dispatchable renewables like geothermal and hydro. New-build wind and solar are cheaper than new-build coal in most markets even without considering external costs.

The fundamental disadvantages of coal — high CO₂ emissions, air pollutants, water consumption, fly-ash disposal, methane emissions from mining, occupational health impacts — were not given enough weight when most coal capacity was built. Modern carbon pricing, air-quality regulations, and capital-market climate policy now reflect these costs explicitly.

Coal’s share of the energy mix

As of recent IEA data, coal generates approximately 35% of global electricity — down from a peak of around 41% in 2007. The decline is uneven: most OECD economies are retiring coal plants steadily, while several large Asian economies continue to add new coal capacity in the short term while planning long-term phase-out.

The economic reality is that running paid-off coal plants is often cheaper than building new generation — but new-build coal struggles to compete with new-build renewables. The transition is mostly about retirement schedules of existing plants, not new construction.

Honest considerations

• Air pollutionCoal combustion is a primary source of NOₓ, SO₂, particulate matter, and mercury emissions. Health-cost externalities are large.
• CO₂ emissionsCoal emits roughly 820 grams of CO₂ per kilowatt-hour at the plant — about double natural gas and 40x renewables.
• Water consumptionCoal plants are heavy water consumers for cooling. This is increasingly a constraint in water-stressed regions.
• Mining impactSurface mining produces large landscape disruption. Underground mining carries occupational health risks.
• Stranded asset riskCoal plants built today face the risk of being shut down before paying back their capital cost as carbon prices rise and renewables get cheaper.

Frequently asked questions

• Why is coal still used if it’s so polluting?Mostly inertia and economics. Existing paid-off plants are cheap to run, and many economies have invested decades of infrastructure and workforce into coal supply chains.
• Can “clean coal” work?Carbon capture on coal plants is technically possible but expensive enough that new-build clean coal cannot compete with new-build renewables plus storage. Most clean-coal demonstration projects have struggled economically.
• What replaces coal for baseload?A combination of renewables, energy storage, dispatchable renewables (geothermal, hydro), demand-flexibility, and natural gas as a transitional fuel. Nuclear remains an option where political and regulatory conditions support it.
• Is coal cheaper than renewables today?New-build coal is typically more expensive than new-build wind or solar per megawatt-hour in most markets. Running existing paid-off coal plants can still be cheaper than new renewables in specific cases.
• How quickly is coal being phased out?Phase-out trajectories vary widely. Most western European economies are exiting coal by the early 2030s. The US is retiring plants steadily. China and India are continuing to add capacity in the short term while planning peaks.
• What happens to coal-region workers?This is a genuine policy question. Successful transitions pair retirements with retraining, regional investment, and replacement industries. Done poorly, communities are left behind.