By Ramachandran Rajeev Kumar — 2025-12-22
In 2004, it took the world an entire year to install one gigawatt of solar power.
Today, we install twice that amount every single day.
This isn't a projection. It's not a policy goal. It's happening right now, measured in steel and silicon and glass, in panels going up on rooftops from Rajasthan to Rotterdam.
Science magazine has named the unstoppable rise of renewable energy its 2025 Breakthrough of the Year. For a journal that typically celebrates discoveries in labs - gene therapies, particle physics, artificial intelligence - this is a remarkable choice. The breakthrough isn't a finding. It's a transformation.
And it's already won.
The Numbers That Changed Everything
The first half of 2025 saw 380 gigawatts of new solar capacity installed globally - a 64% increase over the same period in 2024. The world is on track to add over 750 GW of solar this year alone.
For context: the entire installed solar capacity of the planet in 2015 was 227 GW. We now add more than three times that amount in a single year.
Renewables crossed a historic threshold in 2025: for the first time, they produced more electricity than coal globally. Solar and wind generation grew fast enough to cover the entire increase in global electricity demand from January to June.
Investment tells the same story. Clean energy technologies will attract $3.3 trillion in capital this year. Solar alone drew $554 billion in 2024 - 69% of all renewable financing.
The cost curves that made this possible are brutal for incumbents. Since 2010, solar costs have fallen 90%. Wind is down 70%. Batteries have dropped 90%. Further declines of 10-40% are expected by 2035.
China: The Factory of the Future
Behind every statistic is a supply chain, and one country dominates it completely.
China manufactures 80% of the world's solar cells. 70% of its wind turbines. 70% of its lithium batteries. At prices no competitor can match.
This isn't the result of some invisible hand. For years, Beijing patiently subsidised an industry that seemed perpetually uncompetitive. Now those subsidies have created a manufacturing juggernaut that's reshaping global energy.
In the first half of 2025, China installed 256 GW of new solar capacity - more than all other countries combined. India came second with 24 GW, a 49% year-over-year increase.
The geopolitical implications are profound. The fossil fuel century was defined by control over oil reserves in the Middle East. The clean energy century may be defined by control over manufacturing capacity in East Asia.
The Uncomfortable Truth
Science magazine's editors were careful to include a caveat. Despite the renewable surge, global carbon emissions continue to creep up. The 1.5-degree warming target of the Paris Agreement now seems out of reach.
The numbers are sobering. The remaining carbon budget for limiting warming to 1.5 degrees is approximately 130 billion tonnes of CO2 from the beginning of 2025. At current emission levels, that budget exhausts in about three years.
Human-induced warming has already reached 1.36 degrees Celsius. Global surface temperatures in 2024 rose 1.52 degrees above pre-industrial levels.
This is the paradox of the energy transition: renewables are growing faster than anyone predicted, yet not fast enough to prevent dangerous warming. The growth is unstoppable. It's also insufficient.
India's Bet
India added 45 GW of renewable capacity between January and November 2025, led by 35 GW of solar installations. The country's total non-fossil fuel capacity now stands at 243 GW.
The 500 GW target by 2030 once seemed aspirational. Now it appears achievable - if challenging. Solar alone will need to contribute nearly 300 GW to that total.
The investment requirement is staggering: Rs 30.54 lakh crore (approximately $365 billion) between 2023 and 2030. But the economics increasingly favour the transition. Solar power purchase agreements in India now regularly come in below Rs 3 per unit - cheaper than new coal.
India's domestic carbon market launches in January 2026. The regulatory framework is being built in parallel with the infrastructure.
The Decline That's Already Begun
The IEA's World Energy Outlook 2025 confirms what markets have already priced in: coal has peaked. Global demand for the dirtiest fossil fuel is now in structural decline, displaced by cheaper alternatives.
Oil is next, with demand set to peak around 2030. Natural gas follows by 2035.
The projections assume only current stated policies - no new climate ambition. Under more aggressive scenarios, the decline accelerates further.
Renewables are forecast to generate more than half of global electricity by 2035, up from one-third today. Nuclear power rises 39%. Solar grows 344%. Wind increases 178%.
This is not a plan. It's a trajectory already underway.
What Victory Looks Like
Science magazine's choice reflects a shift in how we understand breakthroughs. The discovery has already happened - decades ago, in laboratories working on photovoltaic efficiency and battery chemistry. What's happening now is deployment at a scale that changes everything.
The energy transition will not be reversed. Too much capital has been committed. Too many factories have been built. Too many jobs depend on it. The question is no longer whether fossil fuels will decline, but how fast.
That pace matters enormously for the climate. The difference between a 1.5-degree and 2-degree world is measured in millions of lives, trillions of dollars, and irreversible changes to Earth's systems.
But the direction is clear. The fossil fuel century is ending. The renewable century has begun.
Science magazine just named it the breakthrough of the year. History will name it something larger: the inflection point when human civilisation began to power itself differently.
The panels keep going up. Two gigawatts today. Two gigawatts tomorrow. Unstoppable.
The Global Carbon Budget 2025 estimates approximately three years remain at current emission levels before the 1.5-degree carbon budget is exhausted. India's domestic carbon market is scheduled to launch in January 2026.