The International Energy Agency has confirmed that renewable energy sources — including solar, wind, hydroelectric, geothermal, and biomass — generated more than 50 percent of global electricity for the first time in 2025, crossing a symbolic and practical threshold that marks the irreversible transformation of the world's energy system. Renewables' share reached 52 percent, up from 43 percent just three years earlier, driven by record installations of solar and wind capacity worldwide.
Solar energy was the primary driver of the milestone, with global solar capacity doubling in three years to exceed 3,000 gigawatts. China alone installed more solar capacity in 2025 than the entire world possessed in 2018. Wind energy also grew strongly, particularly offshore wind in Europe and East Asia, while hydroelectric power maintained its position as the single largest renewable source despite vulnerability to drought conditions in some regions.
The Acceleration Effect
"Crossing the 50 percent threshold is not just symbolic — it fundamentally changes the economics and politics of the energy system," said IEA Executive Director Fatih Birol. "When renewables are the majority, they become the default choice for new capacity, and the question shifts from 'can we transition?' to 'how fast can we go?'"
The cost dynamics continue to favor renewables, with solar electricity now the cheapest source of new power generation in 90 percent of the world and onshore wind competitive in most markets. Battery storage costs have fallen below $100 per kilowatt-hour, making solar-plus-storage systems competitive with natural gas peaking plants even without subsidies.
The transition faces ongoing challenges. Grid integration of variable renewable sources requires massive investment in transmission infrastructure, energy storage, and demand management systems. Fossil fuels remain dominant in heating, transportation, and industrial processes, which are harder to electrify than electricity generation. And the mining of critical minerals — lithium, cobalt, nickel, and rare earths — needed for renewable energy technologies and batteries raises its own environmental and social concerns. Nevertheless, the crossing of the 50 percent threshold represents a point of no return in the energy transition, with momentum that makes a return to fossil fuel dominance virtually impossible.