Bitcoin Energy Consumption: Facts Instead of Headlines

Short answer: Bitcoin's energy consumption is around 120 to 200 terawatt hours a year, about 0.5% of the world's electricity. That is a quarter to a good third of Germany's consumption. According to the University of Cambridge, a little over half comes from renewable and nuclear energy. The consumption depends on the miners' reward, not on the number of transactions.

"Bitcoin uses as much electricity as all of Argentina." "A single transaction eats as much as your household in two months." You have surely read headlines like these, and maybe someone brought them up at the family dinner table. Part of it is true, part of it is miscalculated. This article shows you Bitcoin's energy consumption with figures you can check: how much it really is, where the electricity comes from, why it is needed and which popular comparisons mislead.

How high is Bitcoin's energy consumption really?

Nobody measures Bitcoin's electricity use directly. The miners are spread across many countries and don't report their meter readings. What can be measured is the hashrate: the number of attempts all miners together compute per second. From it and the power draw of the machines, consumption can be estimated soundly.

On Nov 13, 2026, the hashrate according to mempool.space was around 929 EH/s, that is 929 quintillion attempts per second. Modern machines need around 12 to 18 joules per trillion attempts (J/TH), older ones considerably more. Across the global fleet, an average of 15 to 25 J/TH is realistic.

Hashrate 929 EH/s, mempool.space, as of Nov 13, 2026. Our own calculation.

In its industry report of April 2025, the University of Cambridge arrived at 138 TWh a year, around 0.5% of global electricity consumption. Its running index (CBECI) has moved with the hashrate since. A range is therefore the only honest answer, not a figure to the decimal point.

Bitcoin's electricity compared: countries and data centres

A figure like 163 TWh tells you little on its own. Only a comparison shows the order of magnitude:

So Bitcoin uses about as much electricity as Austria and Switzerland together, considerably less than Germany and less than half of all data centres. The last row is the most revealing: world electricity consumption grew by that much in 2024 alone, six to nine times Bitcoin's entire consumption.

That doesn't mean Bitcoin's consumption is small. It is large, but it is no reason for an energy crisis. Country comparisons in headlines are usually calculated correctly; they just leave out the question of what the electricity is used for.

Why Bitcoin needs so much electricity

Bitcoin has no bank that decides which entries are valid. Instead, miners write the blocks, and every block costs real work. This work is called proof of work. How mining works step by step is explained in the guide Bitcoin mining explained.

The electricity is not a waste product here, it is the purpose. Anyone who wanted to reverse an already confirmed payment would have to redo the work of all following blocks and overtake the honest miners. At 929 EH/s that means gigawatts of power and millions of specialised machines, just to reverse your own payments.

Rule to remember: The electricity is the price of nobody being able to rewrite Bitcoin's past, not even a government or a bank.

Gold is similar: its value as money rests on the fact that it can't be produced cheaply. Why exactly this property makes good money is shown in the article What is good money?. Whether this security is worth the electricity to you is your own decision. But the question is "Is the purpose worth it?", not "Is this waste?".

Consumption follows the reward, not usage

Miners are businesses. They only switch machines on when the reward is higher than the power bill. That gives Bitcoin's energy consumption a built-in ceiling: in the long run, the industry can't spend more on electricity than the entire reward.

Two things follow from this. First, consumption only grows if the bitcoin price rises. Where the price currently stands against its long-term trend is shown by the Power Law analysis. Second, every halving shrinks the share of new bitcoin in the reward. How the issuance of new bitcoin falls until 2140 is explained in the beginner's guide What is Bitcoin?.

By the way, your purchase on an exchange doesn't trigger any additional electricity use. The coins just change owners. Blocks are built every 10 minutes anyway, no matter how many people buy.

The "electricity per transaction" myth

The best-known headline divides annual consumption by the number of transactions. With the figures from Nov 13, 2026, you arrive at around 770 kWh per transaction, as much as a two-person household uses in three months.

The division is correct, the statement is still wrong. The electricity doesn't depend on the transactions:

• A block costs the same, whether it holds 900 or 7’000 transactions. In the last 15 blocks, the range was exactly that wide.
• One transaction can contain hundreds of payments. Exchanges pay out many customers in a single transaction.
• The Lightning Network handles any number of payments and only writes the opening and closing of a channel to the blockchain.
• More usage doesn't mean more electricity. If twice as many people used Bitcoin, consumption would stay the same as long as the reward and the price stay the same.

A different comparison is more accurate: the electricity secures the entire stock of around 20.1 million bitcoin, not the individual payment. At 163 TWh, that is around 8’100 kWh per bitcoin per year. At 5 cents per kWh, that costs around €405, about 0.7% of the value of one bitcoin.

Where the electricity comes from: the energy mix

In 2025, the University of Cambridge surveyed mining companies about where their electricity comes from. The result doesn't match the picture of the coal power plant:

Cambridge Digital Mining Industry Report, April 2025. Survey of 49 mining companies.

The figures have limits. Those surveyed were mainly large, often listed companies in the US. Cambridge itself points out that this can skew the results. The direction is clear nonetheless: since 2022 the coal share has shrunk to less than a quarter, and gas and hydropower have taken over. Cambridge estimates emissions at around 39.8 million tonnes of CO₂ a year, about 0.1% of global energy-related emissions.

Mining as a flexible electricity customer

A miner differs from almost every other large consumer: it doesn't have to be near people and can switch off within seconds. A factory or a data centre can't do that. This leads to three areas of use:

1. Using surplus power. Wind and solar parks often produce more than the grid can take at that moment. Instead of curtailing, they sell the electricity to miners on site. Hydropower plants in remote regions find a buyer this way.
2. Relieving the grid. In Texas, miners switch off during heat waves and free up their capacity for households. The miner Riot Platforms received around $31.7 million in credits from the grid operator for this in August 2023.
3. Using flared gas. According to the World Bank for 2024, oil fields worldwide burn around 150 billion cubic metres of associated gas a year unused. Some miners turn this gas into electricity right at the wellhead. Compared with poor flaring, that lowers methane emissions.

These examples are real, but they don't explain the entire consumption. Most mining runs on normal grid connections at cheap industrial rates.

Efficiency: more security per kilowatt hour

The machines have become many times more economical within a few years. The popular model of 2016 needed around 98 joules per TH; a current machine with 200 TH/s and 3.5 kW needs around 17.5 J/TH. That is more than five times as efficient.

But Bitcoin doesn't use less electricity because of it. Because the mining budget follows the reward, miners connect more machines until the electricity barely pays off again. The difficulty adjustment ensures that it still stays at one block every 10 minutes. How exactly that works is in the article Difficulty adjustment: the heart of Bitcoin.

Whether a machine makes a profit or a loss at your electricity price, you can calculate here. In Germany and Switzerland, household prices usually show quickly why miners go where electricity is cheap:

What this means for you as a bitcoin holder

You don't have to defend Bitcoin's electricity use or play it down. Three sentences are enough when someone brings it up:

• It is large: around 0.5% of the world's electricity, about Austria and Switzerland together.
• It has a purpose: it makes the blockchain tamper-proof without you having to trust a bank.
• It has a limit: it follows the miners' reward, not the number of users, and every halving squeezes the budget.

If you want to learn the basics of mining, nodes and the blockchain step by step, you'll find them in the academy under Basics. How we calculate with price data and models on this site is in the methodology. The category Mining & Technology collects more articles on Lightning, nodes and fees.