Bitcoin Mining Electricity Costs: What You Really Pay

In short. An Antminer S21 Pro draws 2,527 kWh per month, the equivalent of an electric heater that never stops. At the US residential average of about $0.16/kWh, that is $404 per month of electricity alone. Hosted at $0.07/kWh, $177. That nine-cent gap is worth roughly $2,700 of margin per year on a single machine.

2026 ballparks

Model	Power	kWh per month	Cost at $0.16	Cost at $0.07
Whatsminer M60S	3,240 W	2,333	$373	$163
Antminer S21 Pro	3,510 W	2,527	$404	$177
Antminer S21 XP Hyd	5,676 W	4,087	$654	$286
Whatsminer M66S Hydro	5,364 W	3,862	$618	$270
Antminer S23 Hyd 3U	11,020 W	7,934	$1,269	$555

The calculation fits on one line: power in W × 24 × 30 ÷ 1000 = kWh per month.

The metric that counts: J/TH

Joules per terahash measures the energy consumed to produce one terahash of compute. The lower it is, the higher the rate a machine tolerates before going cash-negative.

J/TH	Category	Representative models
Under 12	Top of the 2026 market	S23 Hyd 3U at 9.5, S21 XP Hyd at 12
12 to 17	Current generation	S21 Pro at 15
18 to 25	Previous generation	M60S at 18.8
Above 25	Economically outdated	S19j Pro+ at 27.5

At equal hashrate, a 10 J/TH machine costs 40 % less in electricity than a 17 J/TH machine. Over four years of operation, the cumulative gap far exceeds the purchase price difference between them, which is why J/TH outranks the sticker price.

The full calculation method

Step 1, monthly consumption. Multiply power in watts by 24 hours and 30 days, then divide by 1,000 for kWh.

Step 2, monthly cost. Multiply those kWh by your real rate, meaning your bill divided by the kWh consumed, rather than the rate printed on a commercial schedule.

Step 3, annual cost. Multiply by twelve, then subtract about 5 % for outages, reboots, and interventions. A 100 % uptime does not exist, and counting on it distorts any comparison between two hosting offers with different availability commitments.

kWh rates in 2026

US residential

Region	Indicative rate
National average	about $0.16
California and the Northeast	$0.30 and above
Texas	about $0.12
Washington and Idaho	about $0.10

European residential

Country	Equivalent rate
Germany and United Kingdom	$0.30 and above
France, regulated blue tariff	about $0.22
Spain	about $0.25

Professional hosting

Location	Indicative rate
Continental United States	$0.055 to $0.075
Iceland and Norway, hydro	$0.06 to $0.08
France and EU	$0.07 to $0.10
Paraguay, Itaipú hydro	$0.05
Texas industrial, volatile	$0.055 to $0.075

Time-of-use plans deserve a note: off-peak windows typically cover eight hours out of twenty-four. A machine that only runs off-peak produces a third of the hashrate for a third of the revenue, without the purchase price being divided by three. Payback stretches accordingly.

What one cent on the kWh is worth

An S21 Pro draws 2,527 kWh per month, so 30,324 kWh per year.

Rate difference	Annual saving
$0.01	$303
$0.05	$1,516
$0.09, moving from $0.16 to $0.07	$2,729
$0.15	$4,549

One cent negotiated on a hosting contract is therefore worth about $300 per year per machine. Across a ten-machine fleet, that is $3,000 annually for a negotiation that takes an hour. It is the best return on time invested in the whole operation, and colocation costs covers what is actually negotiable.

The heat

One kilowatt electric produces one kilowatt thermal. All the energy an ASIC consumes ends up as heat, since computation is dissipative. For an S21 Pro that means 3.5 kW continuously.

In winter, in an electrically heated house, that heat replaces a radiator's. The kWh then counts twice, for heating and for the BTC produced, which is the only configuration where a residential rate becomes defensible.

In summer, the same heat becomes a problem to evacuate, and any air conditioning added charges straight against your margin.

In an apartment, 3.5 kW dissipated continuously is unlivable, noise aside.

Four levers for cutting the bill

Model choice, by far the most powerful. Moving from an S19 at 27.5 J/TH to an S21 Pro at 15 J/TH cuts the electricity bill by 45 % at equivalent hashrate. No setting closes a generational gap.

Underclocking. Reducing frequency and voltage lowers consumption faster than hashrate. On an S21 Pro, running at 80 % of nominal power costs about 15 % of hashrate for 25 % less consumption, which improves the net result as soon as the kWh is expensive. See the precautions in clock, voltage, and risks.

Peak-hour standby. Scheduling the machine to stop during peak hours is possible on most current-generation ASICs, through firmware or an external controller. The gain depends entirely on the spread between your two rates, and should be computed before anything is installed.

Correctly sized cooling. Insufficient cooling causes thermal derating: the machine loses hashrate without reducing consumption, degrading real J/TH without appearing anywhere. Efficient cooling, conversely, holds the nominal power mode permanently.

Further reading

• ASIC miner ROI calculator guide
• Is bitcoin mining profitable in 2026?
• Hosted bitcoin mining
• Bitcoin mining colocation cost

Rates cited are 2026 orders of magnitude, to verify against your own contract and bill. Mining involves a risk of capital loss.