Solar is Establishing its Dominance Among Energy Sources

Solar power has surged from supplying 1% of global electricity in 2015 to roughly 10% today, outpacing nuclear generation and growing faster than any other energy source this century. Worldwide capacity reached approximately 2,900 gigawatts in 2025, and if current expansion rates continue, installations could hit 9,000 gigawatts by 2030, meeting over 20% of planetary energy demand.

What started as expensive technology limited to space missions now generates the cheapest electricity across much of the world. China dominates both production and deployment, manufacturing over 80% of all solar panels while installing 315 gigawatts of new capacity in 2025 alone.

Total Chinese installations now exceed 1,300 gigawatts, with solar providing 11% of the country’s electricity as coal’s share dropped from 70% to 56% over the past decade. The European Union is second after China with 406 gigawatts, covering roughly 13% of electricity needs while coal fell to just 9%. Hungary, Cyprus, Greece, and Spain each generate over 20% of their power from solar.

The United States holds third position at 267 gigawatts, supplying approximately 8% of total electricity compared to just 1% in 2015. Coal generation halved over ten years, dropping from 34% to 17%. India ranks fourth with 136 gigawatts serving 1.45 billion people, while Japan’s 103 gigawatts meet 11% of domestic demand. Pakistan and South Africa each produced under 1% of electricity from solar in 2015 but now generate 20% and 10% respectively.

Economics are driving the transition from fossil fuels to solar and other renewable sources of energy. Production improvements and manufacturing scale pushed solar costs down roughly 90%, making it the cheapest power source in many regions.

Large installations in sunny areas produce electricity for approximately one euro cent per kilowatt-hour, while German systems cost four to five cents. Battery storage adds just two to three cents. Nuclear costs range from 14 to 49 euro cents, coal runs 15 to 29 cents, and natural gas sits between 15 and 33 cents per kilowatt-hour.

In 2024, solar accounted for 72% of the 632 gigawatts added to global grids, followed by wind at 18%. Cheap solar is reshaping transportation and heating. Electric vehicles charged from home rooftop systems cost over 80% less to operate than diesel or gasoline cars in Germany. Heat pumps typically save European households more than 30% on heating bills compared to oil or gas systems.

While the International Energy Agency predicted 120 gigawatts of new solar capacity for 2024 in its 2020 analysis, actual installations reached 597 gigawatts, nearly five times the projection. Experts now expect solar to become the world’s dominant power source, with researchers modeling a cost-optimal global system where solar provides 76% of energy and wind supplies 20%.

Transitioning to electric vehicles and heat pumps will likely double worldwide electricity demand by 2050, requiring massive grid expansion and battery storage development. Rapid digitalization will prove crucial for coordinating consumption and generation, enabling vehicles to charge automatically when abundant cheap solar floods grids.

As companies like Vision Marine Technologies Inc. (NASDAQ: VMAR) also make progress in transforming maritime transport to run on electricity instead of fossil fuel, the electrification of the transport industry could accelerate at an even higher rate.

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