Calculate bitcoin mining electricity cost per kilowatt hour

05 September 2026

The math connecting electricity rate to mining profit is straightforward, and it is also unforgiving. Every ASIC miner consumes a fixed number of watts. Multiply that by hours run, multiply by your rate per kilowatt-hour, and you get your electricity cost. Subtract that from your Bitcoin revenue. The remainder is your profit or loss.

There is no secret formula. The equation is: Power (kW) × Hours × Rate ($/kWh) = Cost. A 3,250-watt miner running 24 hours uses 78 kWh daily. At $0.12/kWh, that is $9.36 per day; at $0.04/kWh, it is $3.12. The difference is the difference between mining at a profit and mining at a loss.

Residential vs. commercial rates

Residential electricity rates in the United States averaged about $0.16/kWh in 2025. Commercial rates averaged roughly $0.12/kWh, while industrial rates can fall below $0.05/kWh. That range determines who can mine profitably and who cannot.

A residential miner paying $0.16/kWh faces a severe disadvantage. A single Antminer S19 running at 3,250 watts costs roughly $12.48 per day in electricity alone. If that miner produces 0.00025 BTC per day, a rough figure depending on network difficulty, the miner needs a Bitcoin price above roughly $50,000 just to break even. Below that, the operation loses money every day.

Commercial miners negotiate rates based on volume and location. They also avoid the tiered pricing structures that punish residential users who draw high wattage. In many residential plans, crossing a certain usage threshold doubles your rate. That hidden penalty can destroy margins before you account for hardware costs.

The efficiency penalty from cheap power supplies

Not all power supplies deliver the same efficiency. A cheap PSU operating at 80% efficiency wastes 20% of the electricity it draws as heat. That means a 3,250-watt miner actually pulls 3,906 watts from the wall if the PSU is only 80% efficient. Your electricity bill reflects the higher number; your hash rate does not increase.

The difference is substantial. At 80% efficiency, the daily power cost at $0.12/kWh becomes $11.25 instead of $9.36. That is a 20% increase in cost with zero increase in revenue. Over a year, that difference adds up to roughly $690 per miner.

Premium PSUs rated at 92-94% efficiency cost more upfront and waste less electricity as heat. That lower waste means lower cooling costs, since heat must be removed from the mining area. The combination of lower power draw and lower cooling load makes efficient PSUs essential for any operation that intends to run longer than a few months.

240V vs. 120V Circuits for ASIC Operation

ASIC miners draw high current. Running them on 120-volt circuits creates problems. A 120V, 15-amp circuit delivers a maximum of 1,800 watts; a 120V, 20-amp circuit delivers 2,400 watts. Most modern ASIC miners draw 3,000 watts or more. You cannot run a single miner on a standard 120V circuit without tripping breakers.

240-volt circuits solve this. A 240V, 20-amp circuit delivers 4,800 watts, enough for one high-end miner with headroom. A 240V, 30-amp circuit delivers 7,200 watts, enough for two miners on a single circuit.

There is a second advantage: higher voltage reduces current for the same power draw, and lower current means less resistive heating in wiring. Less heating means lower fire risk and less voltage drop over long cable runs. Voltage drop is real. Running a miner at 115V instead of 120V reduces PSU efficiency, which increases the efficiency penalty described above. Many residential buildings lack 240V outlets in convenient locations, and installing one requires an electrician. That cost should be factored into any mining budget.

Practical Takeaway

Calculate your all-in electricity cost per kWh. That includes delivery charges, taxes, and any tiered rate penalties. Do not use the generation rate alone. The difference between $0.10/kWh and $0.12/kWh on a 3,250-watt miner running 24/7 is roughly $584 per year. That is real money.

If your rate exceeds $0.12/kWh, mining at home is likely unprofitable unless Bitcoin prices rise substantially or hardware costs fall. If your rate is below $0.05/kWh and you have access to 240V power, the math shifts in your favor. The electricity rate is the single most important number in mining. Everything else is secondary.

Back to mining