Fossil fuels supply about 86% of the world’s energy. Oil, coal, and natural gas together remain the dominant energy sources by a wide margin, a fact that surprises many people given the rapid growth of solar and wind power in recent years. The gap between fossil fuels and everything else is smaller for electricity specifically, but for total energy (which includes transportation, heating, and industrial processes), the picture is still heavily tilted toward burning hydrocarbons.
The Global Energy Mix
Oil is the single largest energy source worldwide, primarily because it fuels nearly all road, air, and sea transportation. Coal comes second, still heavily used for electricity generation and steelmaking, particularly in Asia. Natural gas rounds out the top three and is the fastest-growing fossil fuel. In the United States alone, natural gas consumption hit record highs in 2025, reaching 91.8 billion cubic feet per day, the highest level since tracking began in 1949.
Beyond fossil fuels, the remaining 14% of global energy comes from a mix of nuclear power, hydroelectricity, wind, solar, and biomass. Traditional biomass (wood, charcoal, and animal waste burned for cooking and heating) still accounts for roughly 7% of primary energy worldwide, though it rarely appears in energy charts because it isn’t bought and sold in formal markets. Over 2 billion people still depend on it daily.
Why Renewables Seem Bigger Than They Are
Renewables generated a third of the world’s electricity in 2024, which sounds impressive. But electricity is only one slice of total energy use. When you factor in transportation fuel, industrial heat, and building heating, renewables met just over 8% of total global energy demand. That disconnect explains why headlines about solar records can coexist with data showing fossil fuels still at 86%.
The confusion comes from conflating electricity with energy. Electricity generation is roughly 20% of total energy consumption. So even a massive shift in how we generate electricity doesn’t immediately transform the full energy picture, which includes the diesel in cargo ships, the natural gas heating homes, and the coal used in blast furnaces.
How Electricity Generation Differs
The electricity grid looks very different from the total energy mix. Coal and natural gas are still the two largest sources of electricity globally, but hydropower is the third largest, supplying about 17% of the world’s electricity. Nuclear power provides another significant chunk. Wind and solar have grown rapidly and now contribute a meaningful share, particularly solar, which added nearly 452 gigawatts of new capacity in 2024 alone, growing by 32%.
Hydropower is a good example of how context matters. Its total capacity has risen 70% over the past two decades, but its share of global electricity generation has stayed roughly flat because coal, gas, wind, and solar were all growing at the same time. A source can expand dramatically in absolute terms while holding steady or even shrinking as a percentage of the total.
Renewables Are Growing Fast, From a Small Base
Global renewable power capacity grew by 585 gigawatts in 2024, a record 15.1% annual growth rate that topped the previous year’s 14.3%. Solar and wind together accounted for 96.6% of that new capacity. Solar was the standout, reaching 1,865 gigawatts of total installed capacity worldwide.
When looking at where new energy supply is coming from, the balance is shifting. In 2024, renewables accounted for the largest share of growth in total energy supply at 38%, followed by natural gas at 28%, coal at 15%, oil at 11%, and nuclear at 8%. So while the installed base is still overwhelmingly fossil fuel, the new additions are increasingly renewable. The transition is real but gradual, because the existing infrastructure (power plants, vehicles, industrial equipment) was built to run on fossil fuels and takes decades to turn over.
Why Fossil Fuels Are Hard to Displace
Three characteristics keep fossil fuels dominant. First, they’re energy-dense. A gallon of gasoline or a ton of coal packs an enormous amount of energy into a small, easily transported package. Second, the entire global economy was built around them over 150 years, from refineries and pipelines to engines and furnaces. Third, some uses are particularly difficult to electrify. Aviation, shipping, cement production, and steelmaking all rely on fossil fuels in ways that don’t have simple renewable substitutes yet.
Transportation alone consumes roughly a quarter of global energy, and the vast majority of that is oil. Even as electric vehicles grow rapidly, the global fleet of over a billion cars, trucks, ships, and planes turns over slowly. Industrial heat is another stubborn category. Many manufacturing processes require temperatures above 1,000°C, which is difficult and expensive to achieve with electricity.
The Short Answer
Oil, coal, and natural gas provide 86% of the world’s energy. Renewables are the fastest-growing source and dominate new capacity additions, but they still supply just over 8% of total energy demand. The gap is closing, particularly in electricity generation, where renewables now produce a third of global power. But for the full picture, including transport, industry, and heating, fossil fuels remain overwhelmingly dominant.