We hear a lot of noise about energy. On one side, you have the “keep it in the ground” activists. On the other, the “drill, baby, drill” crowd. But if you actually sit down and look at the data coming out of places like the International Energy Agency (IEA) or journals like Energy Policy and Applied Energy, you realize the story is way more nuanced—and honestly, way more fascinating—than the screaming headlines suggest.
I spent last weekend falling down a rabbit hole of energy reports, so you don’t have to. Specifically, I was digging through the IEA’s Renewables 2025 report and their Global Energy Review 2025. Here is the reality of where we stand with the global energy mix, stripped of the politics.
The 80% Reality Check
Let’s get one thing out of the way immediately. If you look at the global energy demand today, fossil fuels—oil, coal, and natural gas—are absolutely dominating the conversation. In 2024, they met the vast majority of the world’s needs .
That number often surprises people who only read cleantech blogs. But here is the plot twist: even though the volume of fossil fuels we use is still massive, their share is shrinking. According to the IEA, oil’s share of the global energy mix actually fell below 30% for the first time ever in 2024. Think about that—50 years after the oil shocks of the 1970s, when oil was pushing 46%, we are finally seeing a dent in that armor.
We aren’t “quitting” fossil fuels cold turkey. We are slowly, but surely, diluting them.
The Solar Juggernaut (and the Grid Problem)
If you read the Applied Energy journals, you’ll see a lot of technical talk about “grid integration” . But in plain English, here is what is happening: Solar PV is growing like crazy. The IEA projects that global renewable capacity is going to double by 2030, and solar accounts for almost 80% of that growth .
But here is the kicker that doesn’t get enough attention: We are building solar farms faster than we are building the wires to connect them.
The IEA data shows that “curtailment” levels—that’s industry-speak for turning off solar panels because the grid can’t handle the juice—are rising everywhere from China to Germany to California . We are also seeing negative electricity prices in the middle of the day because suddenly, when the sun is high, everyone is producing power at once.
This is actually a good problem to have. It’s a sign of success. But it highlights a reality that Energy Policy journal has been warning about for years: you can’t just build generation; you have to build storage and transmission, too.
The Geopolitics of “Fuel-Free” Energy
One of the most overlooked angles in this shift is geopolitics. I came across a stat in the IEA’s work that stopped me cold.
Since 2010, the vast majority of new renewable capacity built worldwide was installed in countries that rely on imported fossil fuels . Think about what that means.
Countries like India, Chile, and many European nations have been held hostage by energy prices for decades. If you don’t have your own oil or gas, you are at the mercy of pipelines and tankers. But the IEA report highlights that thanks to wind and solar, these countries collectively avoided importing massive amounts of coal and natural gas in recent years . This isn’t just about saving the planet anymore; it’s about sovereignty. When your energy comes from the wind blowing across your fields or the sun hitting your roof, no foreign leader can turn off the tap.
The “Quiet” Growth of Everything Else
While solar gets the headlines, the Global Energy Review notes that electricity demand itself is exploding. Global electricity use surged in 2024, growing much faster than the overall economy .
Why? Three reasons:
- Heatwaves: We are using way more AC to stay alive .
- Electric Vehicles: Global sales of electric cars rose significantly, accounting for a major share of all car sales .
- Data Centers: We are all streaming, scrolling, and now running AI models that require insane amounts of power. The installed capacity of data centres grew by an estimated 20% in 2024 .
This surge in demand means that even though renewables are growing fast, natural gas is also seeing a resurgence in some areas to keep the lights on 24/7 . The energy transition isn’t a straight line; it’s a messy, complex shuffle.
What Comes Next?
Looking at the forecasts from the IEA, the writing is on the wall. They predict that by 2030, global renewable power capacity will increase by thousands of gigawatts—the equivalent of adding the entire power generation capacity of major economies combined .
We are living in the awkward adolescence of the energy transition. We haven’t fully outgrown our old habits, but we can see the adult we are trying to become. It’s going to be a wild ride.
References
[1] IEA, Global Energy Review 2025. Paris: IEA, 2025. [Online]. Available: https://www.iea.org/reports/global-energy-review-2025
[2] Energy Policy. Elsevier, 2025. [Online]. Available: https://EconPapers.repec.org/article/eeeenepol/default34.htm
[3] H. Asadi Aghajari et al., “Analyzing complexities of integrating Renewable Energy Sources into Smart Grid: A comprehensive review,” Appl. Energy, p. 125317, 2025.
[4] IEA, Renewables 2025. Paris: IEA, 2025.
[5] IEA, “Global trends,” in Global Energy Review 2025. Paris: IEA, 2025.
[6] Applied Energy, “Guide for authors,” Elsevier, 2025. [Online]. Available: https://www.sciencedirect.com/journal/applied-energy/publish/guide-for-authors
[7] IEA, “Key findings,” in Global Energy Review 2025. Paris: IEA, 2025. [Online]. Available: https://www.iea.org/reports/global-energy-review-2025/key-findings