Some headlines are more wishful thinking than fact. The cited 2025 breakdown from Steptoe, which references the Cambridge Digital Mining Industry Report from April 2025, still shows natural gas as Bitcoin mining’s largest energy source, not hydropower.
- Natural gas leads Bitcoin mining’s energy mix at 38.2%.
- Hydropower is second at 23.4%.
- 52.4% of mining power now comes from non-fossil sources.
- The real story is not “clean won”, it’s that Bitcoin mining is getting less cartoonishly dirty.
That matters because Bitcoin mining is one of the most argued-over uses of energy in finance. Critics still like to paint it as a carbon bonfire with a ticker symbol. Supporters argue it can monetize stranded power, support grid flexibility, and pull investment toward infrastructure that would otherwise sit idle. Both sides have a point. Neither gets to declare victory and go home.
Bitcoin mining, in plain English, is the process that secures the network and confirms transactions. Miners compete using computing power, and that means electricity, lots of it. That energy cost is not some accidental flaw bolted onto the system. It is the mechanism that makes the network expensive to attack. Bitcoin does not run on good intentions and marketing decks.
The headline claim that hydropower has overtaken natural gas does not hold up in the cited data. According to the Cambridge Digital Mining Industry Report, as cited by Steptoe, the global Bitcoin mining energy mix breaks down like this:
- Natural gas: 38.2%
- Hydropower: 23.4%
- Wind: 15.4%
- Nuclear: 9.8%
- Coal: 8.9%
- Solar: 3.2%
- Oil: 0.5%
- Other renewables: 0.5%
That means hydropower is a major source, but not the top one. Natural gas still leads by a meaningful margin.
The broader picture is still worth paying attention to. The same breakdown shows that 52.4% of Bitcoin mining power now comes from non-fossil sources. That category includes renewables plus nuclear. It does not mean “renewable only, ” and it does not mean “carbon-free.” Nuclear is low-carbon, yes, but it is not renewable. Fossil fuels still account for 47.6% of the mix, which is hardly a rounding error.
That nuance matters because the Bitcoin energy debate is often mangled by lazy slogans. The old “all miners burn coal” line is stale. It ignores the growing share of hydropower, wind, and nuclear in the mix. But the opposite claim, that Bitcoin mining is basically green now, is just as sloppy. Natural gas remains the biggest single source, and nearly half the network’s energy still comes from fossil fuels.
Natural gas deserves a careful take rather than a knee-jerk one. Yes, it is a fossil fuel, so pretending it is environmentally neutral is nonsense. But some mining operations use gas that would otherwise be flared, meaning burned off at the wellhead when it cannot be captured or transported. In those cases, mining can turn wasted fuel into usable work. That is not a magic clean-energy loophole, but it is also not nothing.
Bitcoin mining can also act as a flexible load. In simple terms, that means miners can ramp activity up or down depending on power prices and grid conditions. In theory, that can help stabilize electricity systems by soaking up excess supply when power is abundant and shutting down when the grid is stressed. Some miners genuinely do this. Others are just power-hungry operators with a better press kit.
The network itself is still getting more competitive, too. The cited material says the block reward is now 3.125 bitcoins per successfully mined block. It also says hash rate reached 1.12 billion terahashes per second on September 12, and mining difficulty hit 136.04 trillion at block 914, 374, up 7.62% over the preceding 90 days.
For readers who do not live and breathe mining jargon: hash rate is the total computing power securing Bitcoin, while difficulty is the rule that keeps block production on schedule even as more machines join the race. Higher difficulty means miners need more effort to win rewards. Translation: the competition is brutal, and the system is designed that way on purpose.
That is not a bug. It is the point of Proof of Work, Bitcoin’s security model. Miners spend electricity to compete for block rewards, and that real-world cost makes attacks expensive. Supporters see that as a feature: a monetary network secured by physics, not by trust in some central operator’s good mood. Critics see waste. The more useful view is less dramatic and more honest: Bitcoin trades energy use for security, and whether that trade is worthwhile depends on how you value censorship resistance, neutrality, and sovereignty.
The environmental conversation is shifting, but slowly. The data cited here shows a mining mix that is more diversified than the stale “coal-powered crypto” caricature suggests. Hydropower is a major contributor. Wind and nuclear also matter. Still, natural gas remains the largest single source, and fossil fuels are far from gone.
So the sharpest reading is not that hydropower has won. It is that Bitcoin mining is becoming less dirty than critics claim, but not clean enough to earn a victory lap. That is a more useful conclusion than the headline’s easy brag.
Key takeaways
-
Has hydropower overtaken natural gas in Bitcoin mining?
No. The cited 2025 breakdown still puts natural gas first at 38.2%, with hydropower at 23.4%. -
What percentage of Bitcoin mining is powered by non-fossil sources?
52.4%, according to the Cambridge Digital Mining Industry Report as cited by Steptoe. That includes renewables and nuclear, so it is not the same thing as “renewable-only.” -
Is Bitcoin mining still dependent on fossil fuels?
Yes. Fossil fuels still make up 47.6% of the mix, with natural gas alone larger than any other single source. -
Does Bitcoin mining waste energy for nothing?
Not exactly. Mining is the mechanism that secures Bitcoin through Proof of Work, so the electricity cost is part of the security model. -
Can Bitcoin mining help power grids?
Sometimes. Flexible miners can turn down during peak demand or absorb excess power when supply is abundant, but not every operation behaves that way.
The bigger lesson is that Bitcoin keeps forcing uncomfortable questions about how energy should be used. Should power sit idle if nobody can profit from it? Should wasted gas be captured or left to burn off? Should a monetary network be judged like a social app, or like a hard industrial system protecting billions in value?
Bitcoin does not answer those questions politely. It drags them into the open and makes everyone argue about electrons, emissions, economics, and sovereignty at the same time. That is annoying. It is also the point.
Further reading
A few related takes and data points worth keeping on the desk while the mining-energy debate keeps pretending it’s simpler than it is.
- Hydropower overtakes natural gas as Bitcoin mining’s top energy source
- Bitcoin Mining: Energy Mix, Policy Developments, and Legal
- Bitcoin Mining's Energy Mix in 2026: Renewables, Stranded
- Bitcoin Mining’s Future: From Proof of Work to Proof of Value for Commerce
- Hydropower Overtakes Gas as Bitcoin Mining Power Demand Hits 190 TWh
- U.K. Energy Firm Reabold Tests Bitcoin Mining with Gas to Fund Projects
