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Clear out junk files and repair common Windows errorsFree Scan →Scan for outdated or missing drivers - takes under a minuteDriver Scan →Repair Windows errors before they cause bigger problemsFix Now →Bitcoin mining energy costs shape miners’ operating margins, which can influence how much computing power stays online. A miner earns the block subsidy and transaction fees, then pays for electricity and other costs. Cheaper power or more efficient machines can help a miner withstand weaker revenue, but neither guarantees a profit. If enough miners leave, hashrate can fall; Bitcoin’s difficulty adjustment responds to that change to keep blocks arriving at roughly 10-minute intervals on average. It does not keep mining profitable.
How electricity costs affect mining profitability
A miner’s basic operating question is whether expected revenue covers the costs of running its machines. Revenue comes from the block subsidy and transaction fees. Electricity is a major cash expense, alongside hardware, facilities, cooling, maintenance, staffing, hosting, financing and downtime.
The power bill depends on a machine’s draw, how long it runs and the price the operator actually pays under its electricity contract and local market conditions. A lower electricity price can improve margins, but it is only one part of the calculation. Bitcoin’s price, transaction-fee revenue and network difficulty can change, too.
Why hardware efficiency matters
Mining machines perform computations using specialized ASIC hardware. Their efficiency is commonly expressed in joules per terahash (J/TH): a lower figure means less energy is used for a given amount of computational work. Efficiency can affect how much electricity an operator spends to contribute a given amount of hashrate, but it does not by itself establish whether a machine is profitable.
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A comparison between two miners or sites should account for more than efficiency. Relevant factors include electricity price and contract structure, machine power draw and uptime, cooling and other facility expenses, hardware purchase and financing costs, pool fees and payout terms, expected subsidy and transaction fees, Bitcoin price exposure, and the possibility of power curtailment.
How miner economics feed back into the Bitcoin network
Miners compete to find a valid proof of work. A miner’s chance of earning a block reward is related to its share of the network’s computational power. Mining pools combine participants’ work and distribute proceeds according to contributed shares, as described in the Bitcoin developer guide to mining.
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When expected revenue improves relative to costs, miners may add capacity or keep less efficient machines running. When margins deteriorate, an operator may curtail equipment or retire it. If network hashrate changes, Bitcoin’s difficulty adjustment changes the work required to find blocks, helping restore the target pace of roughly one block every ten minutes on average. Difficulty does not set electricity prices, guarantee miner profits or ensure that every machine remains online.
The subsidy, fees and miners’ revenue
After the April 2024 halving, the block subsidy is 3.125 BTC per block. Miners may also receive transaction fees included in a block. The subsidy declines at successive halving events; the next scheduled reduction follows another 210,000 blocks. As subsidy revenue changes, fees and operating costs are among the factors affecting the revenue available to miners. The future value of mining rewards cannot be inferred from today’s subsidy alone because Bitcoin’s price, transaction demand and fees, hashrate and costs are uncertain. See the Bitcoin developer guide for an explanation of mining and rewards.
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How much electricity does Bitcoin mining use?
There is no single exact, directly metered figure for the entire network in the Cambridge estimates. Cambridge’s Bitcoin Electricity Consumption Index (CBECI) uses a hybrid top-down model based on estimated hashrate, hardware efficiencies and an assumed electricity price. The model uses profitability assumptions to estimate which devices could remain in operation, and models a mixed hardware fleet because a complete, reliable time series of manufacturers’ market shares is unavailable. Its results are estimates tied to dates and methodology, not a fixed electricity requirement per bitcoin mined or transaction processed. The CBECI methodology explains the approach.
Cambridge’s 2025 report estimated annualized Bitcoin mining electricity consumption at 138.2 TWh on June 30, 2024, about 0.54% of global electricity use. Its model series reached 183 TWh by December 31, 2024. The latter is a modeled annualized estimate, not a total measured by meters across all mining operations. The two figures are date-specific estimates and should not be treated as current readings for 2026. See the Cambridge Centre for Alternative Finance’s 2025 Bitcoin mining industry report.
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A site’s electricity bill and the network’s estimated consumption answer different questions. The bill reflects that operator’s equipment, power use and contract; a network estimate combines assumptions about the mining fleet and its activity. Neither tells a reader how much electricity is inherently required to produce one bitcoin or process one transaction.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What Cambridge’s cost and energy figures do—and don’t—show
Cambridge’s 2025 report surveyed 49 mining firms. At the report’s June 2024 data snapshot, their operations represented about 48% of network hashrate. Within that sample, electricity accounted for over 80% of cash-based operating expenses. The median electricity-only cost was $45/MWh, while the median all-in cost was $55.5/MWh.
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These are survey benchmarks, not a universal tariff or a live estimate of every miner’s costs. They describe the surveyed firms and the report’s snapshot, not all operators worldwide. The all-in figure also reflects costs beyond electricity, which is why it differs from the electricity-only median.
Energy mix adds context to consumption
Electricity consumption alone does not describe environmental impact: generation mix and geography matter. In its 2025 report, Cambridge found that surveyed miners’ 2024 energy mix included a 52.4% sustainable-energy share—42.6% renewables and 9.8% nuclear. The same survey reported 38.2% natural gas and 8.9% coal. For comparison, the report’s 2022 estimate put natural gas at 25.0% and coal at 36.6%. These are survey results, not a universal measurement of every mining operation’s power supply. Cambridge researcher Alexander Neumueller notes that “electricity consumption is crucial to understanding Bitcoin’s environmental footprint” but “is only one element.” Details and qualifications appear in the Cambridge report.
Does cheaper electricity make Bitcoin more secure?
Not by itself. Mining expenditure supports proof-of-work competition, but an electricity price or consumption estimate alone does not measure network security. Security also depends on hashrate, the value of mining rewards, the distribution and control of mining capacity, and the cost and feasibility of an attack. The figures above do not quantify attack cost, and low power prices for an individual operator do not establish that the network is secure or that the operator is profitable.
What to compare when evaluating mining economics
- Electricity: the actual price paid, contract terms and exposure to changing power-market conditions.
- Equipment: efficiency in J/TH, power draw, uptime and acquisition or financing cost.
- Operating overhead: cooling, facility costs, maintenance, staffing, hosting and pool fees.
- Revenue assumptions: the subsidy, transaction fees, Bitcoin price and the miner’s share of total hashrate.
- Operating flexibility: whether equipment can be curtailed when power costs rise or expected revenue falls.
An ASIC model such as the Antminer S21 is an industrial example of the hardware used in Bitcoin mining; manufacturer documentation includes S21 support materials. A model’s efficiency specification alone cannot establish its profitability for a particular reader, site or electricity contract.
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