Climate experts have already warned the majority of coal power needs to be retired in just over a decade to avert catastrophic global warming, but many nations continue to lean heavily on this high-polluting substance.
In the first study of its kind, financial think tank Carbon Tracker analysed the profitability of 6,685 coal plants worldwide, representing 95 per cent of all existing capacity.
They found that as prices reach record highs, 42 per cent of coal capacity is already unprofitable.
This figure is expected to rocket upwards in the coming years due to taxes on CO2 emissions and stricter air-pollution laws.
By 2030 the proportion of unprofitable coal will be likely to exceed 70 per cent while the cost of renewable energy sources such as wind and solar is slashed.
The report comes ahead of a major UN climate summit taking place in Poland, a nation that has already proved a controversial choice due to its reliance on coal for 80 per cent of its electricity.
Many countries, including the UK, have already set hard targets to eliminate coal entirely from their energy mix within the next few years.
Elsewhere concerns about economic growth and jobs have both contributed to a dependence on coal, but the new report suggests such worries are misplaced.
Matt Gray, head of power and utilities at Carbon Tracker, said their analysis “provides a blueprint for policymakers, investors and civil society”.
“Lobbying and cronyism, that’s the only thing that can save coal, and we are seeing that from Donald Trump and others throughout the world,” he told The Independent.
The US president has repeatedly emphasised his enthusiasm for “beautiful, clean coal”, but the analysis suggests his country would save $78bn (£61bn) by shutting plants in line with the Paris climate agreement.
In China, by far the world’s biggest coal burner, this figure is $389bn (£304bn).
Currently, consumers and taxpayers are picking up the bill for coal and keeping the industry profitable thanks to government subsidies.
While a phase-out would save these people billions, it would be a massive financial hit for coal-owners’ profits.
Earlier this week, the UN warned that nations needed to drastically increase their commitments to cutting carbon emissions, increasing them up to fivefold if some of the worst effects of climate change are to be avoided.
Carbon Tracker recommended that governments that have not already done so must implement plans to phase out coal rapidly, beginning with the least economic plants.
Sebastian Ljungwaldh, Carbon Tracker energy analyst and co-author of the study, said it was clear that coal “should be seen as an economic inevitability rather than a clean and green nicety”.
More about: coalplants