Bitcoin, Energy & the Renewable Revolution

Every few months, a new headline declares that Bitcoin is going to cook the planet. And every few months, Bitcoin miners quietly set up shop next to a wind farm, a volcano, or a gas well that would otherwise be flaring methane into the atmosphere.

Both things are happening. The question worth asking isn't is Bitcoin using energy — of course it is — but what kind of energy, and what happens when you use it well?

Let's start with the honest number

According to the Cambridge Centre for Alternative Finance — the most widely cited independent research body on this topic — Bitcoin mining consumed roughly 138 to 211 terawatt-hours (TWh) of electricity in 2025, depending on the estimate and the time of year. That's approximately 0.5–0.8% of global electricity consumption.

To put that in country terms: it's comparable to the electricity use of Thailand or Poland. For some people, that number ends the conversation. For others, it's where the conversation gets interesting.

The energy mix is changing — fast

In 2022, roughly 37.6% of Bitcoin's energy came from sustainable sources. By 2025, that number had climbed to 52.4%, according to Cambridge's Digital Mining Industry Report — the most comprehensive survey of actual mining operations ever conducted, covering nearly half of global hashrate.

That sustainable 52.4% breaks down as:

• Hydropower: 23.4% — the single largest renewable source
• Wind: 15.4% — growing quickly as miners co-locate with wind farms
• Nuclear: 9.8% — zero-emissions baseload power
• Solar: 3.2% — still small but expanding
• Other renewables: 0.5% — geothermal, tidal, and emerging sources

Coal — once the dominant source when most mining happened in China — has collapsed from 36.6% of the mix in 2022 to just 8.9% in 2025. Natural gas has largely replaced it as the primary fossil fuel, at 38.2%.

That's not a perfect story. Natural gas still produces emissions. But the trajectory — coal collapsing, renewables rising — is real and measurable, not marketing spin.

Let's put Bitcoin's footprint in context

Context doesn't excuse problems, but it does help us understand where to focus. Here's how Bitcoin's energy use compares to some other industries we rarely question.

* Banking has two footprints worth separating. The operational footprint (branches, ATMs, data centers) is ~263 TWh — comparable to Bitcoin. But banks' financed emissions — the CO₂ from the industries they lend to — represent roughly 99% of their total carbon impact, according to Bank.Green. The $869 billion the top 65 banks directed to fossil fuel companies in 2024 enabled far more emissions than their own servers ever could. Bitcoin has no equivalent financed emissions.

The fashion industry comparison deserves a moment. According to the UN Environment Programme and multiple peer-reviewed studies, the global fashion industry — the clothes we wear and discard — produces roughly 1.2 billion tonnes of CO₂ per year, accounting for 8–10% of global carbon emissions. That's more than international aviation and maritime shipping combined. One rubbish truck's worth of textiles goes to landfill every second.

Bitcoin's entire network produces an estimated 39.8 million tonnes annually, according to Cambridge. The fashion industry's footprint is roughly 30 times larger.

The problem no one talks about: stranded energy

Here's something genuinely counterintuitive. A significant amount of renewable energy is generated and then wasted — not because we don't want to use it, but because there's no one nearby to use it yet.

Solar farms and wind installations often produce more electricity than the local grid can absorb, especially during peak generation hours. That surplus electricity either gets curtailed (turned off at the source) or transmitted at a loss over long distances. Either way, the clean energy goes to waste.

Bitcoin miners have discovered that they can set up shop right next to these curtailed renewable sources — buying the surplus power at very low cost before it's ever connected to the grid. In this model, the miner isn't competing with your home's electricity. They're consuming power that would otherwise be discarded.

A 2024 study in the journal Heliyon took this further: a solar-powered Bitcoin mining system could achieve a return on investment in 3.5 years, compared to 8.1 years for selling electricity to the grid — while preventing an estimated 50,000 tonnes of CO₂ annually. The math of renewable energy gets better when Bitcoin is in the equation.

The flared gas problem — and Bitcoin's surprising role

When oil is extracted, natural gas often comes up alongside it as a byproduct. In remote locations without pipelines, that gas has historically been burned off in a process called flaring — a wasteful practice that sends methane and CO₂ directly into the atmosphere. Methane is a particularly potent greenhouse gas: over 80 times more warming than CO₂ over a 20-year period.

The World Bank estimates that roughly 14 billion cubic feet of gas is flared globally every day. Crusoe Energy, a company co-founded in the U.S., pointed out something striking: if all that flared gas could be captured and used for computing, it could theoretically power the entire Bitcoin network eight times over.

Crusoe's model is simple. They deploy mobile data centers onto oilfield sites where flaring occurs. The stranded gas that would otherwise be flared is instead fed to a generator, which produces electricity to power Bitcoin mining. Unlike open flaring — which is incomplete and releases methane — this process burns the gas cleanly and converts it to useful work. ExxonMobil has partnered with Crusoe for exactly this purpose in North Dakota.

Other companies have followed. Upstream Data operates in Canada. Marathon Digital Holdings uses excess natural gas from U.S. shale operations. Argentina's state-owned YPF Luz has partnered with Genesis Digital Assets to reduce emissions from stranded wells. In this framing, Bitcoin mining isn't adding to emissions — it's capturing waste that was going to happen anyway and doing something productive with it.

The pioneers: companies changing the equation

The grid stability argument: miners as shock absorbers

There's a less-discussed way that Bitcoin mining can benefit energy systems: demand response.

Unlike a hospital, a factory, or a home, a Bitcoin miner can turn off instantly — within 5 to 15 seconds — when the grid is under stress. Miners enrolled in demand response programs voluntarily curtail their operations during peak demand events, selling that capacity back to the grid operator.

In Texas, Riot Platforms earns significant revenue from exactly this: reducing demand during grid stress events and providing power back to ERCOT. During a heat wave or cold snap, Bitcoin miners essentially become a reserve buffer — flexible load that can disappear on command to protect the grid's stability.

This is almost the opposite of the narrative that Bitcoin mining destabilizes grids. When structured with proper power purchase agreements and curtailment contracts, mining facilities become some of the most responsive and cooperative participants in a modern energy system.

The honest counterargument

This wouldn't be a complete picture without acknowledging the genuine criticisms. Some are well-founded.

A 2025 study in Nature Communications found that the 34 largest U.S. Bitcoin mines consumed 32.3 TWh between 2022 and 2023 — with 85% of that increased demand coming from fossil fuel power plants. Not all mining is clean mining, and the industry's rapid growth has outpaced its renewable transition in some regions.

The argument that Bitcoin mining supports renewable energy by buying curtailed power only holds when miners actually do that — and some operate on coal or natural gas grids with no curtailment program whatsoever. The picture is genuinely mixed.

Electronic waste is also a real concern. Bitcoin mining hardware (ASICs) becomes obsolete as the network's difficulty rises. Cambridge estimates roughly 2,300 tonnes of e-waste annually in 2024 — though the same report notes that 87% of hardware is recycled, sold, or repurposed, a higher rate than consumer electronics broadly.

And the water footprint — cooling data centers requires water. This is a localized problem that depends heavily on how a facility is cooled and where it's located.

Energy begets energy — when you do it right

Here's the concept Natalie Brunell explores in her work: when Bitcoin mining is paired thoughtfully with renewable infrastructure, something interesting happens to the economics.

Renewable energy projects — solar farms, wind installations, geothermal plants — face a chicken-and-egg problem. They need guaranteed buyers to justify construction, but buyers only show up once the power is flowing. Bitcoin miners can be the guaranteed anchor buyer, providing revenue during the early years of a project before the grid connection is complete or fully utilized.

That anchor revenue makes the project bankable. The project gets built. The grid eventually absorbs the clean energy. The miner moves on to the next curtailed project. Clean energy infrastructure that might have waited years gets built years earlier — because Bitcoin provided the economic bridge.

This is what "energy begets energy" looks like in practice. The first investment — the one that seemed too risky — gets made because a Bitcoin miner needs cheap power. The clean energy gets built. The next investment is easier. The grid gets cleaner. The miner keeps moving to wherever the next stranded renewable source is waiting.

What does this mean for a small merchant?

If you're accepting Bitcoin at your counter, you're participating in a network that uses energy — there's no way around that. But you're also participating in a network that is measurably, verifiably becoming more renewable every year. The Cambridge numbers aren't spin — they're survey data from actual miners.

You're participating in a network that has never required a bailout, never printed more of itself to solve a financial crisis, and whose security comes from the honest expenditure of real-world resources. Whether that trade-off is worth it is a question only you can answer.

What's worth knowing is that the people building this industry at its edges — the ones co-locating with solar farms before they're connected to the grid, capturing gas that would otherwise be flared, mining with Icelandic geothermal heat — are working on exactly the right problem. Energy begets energy, when you do it right.