Definition
Electricity Cost is the price you pay for the energy an ASIC consumes while mining, normally expressed per kilowatt-hour (kWh). It is the single largest recurring expense in Bitcoin mining and the number that decides whether a machine earns more than it burns.
Also known as: power cost, energy cost, electricity rate ($/kWh).
How electricity cost is calculated
A miner draws a steady load measured in watts at the wall. Multiply that load by the hours it runs to get kilowatt-hours, then multiply by your rate. A machine pulling roughly 3,000 watts running all month consumes about 2,160 kWh; at 10 cents per kWh that is about $216 in power alone. Your real number depends on local tariffs, which often layer in delivery charges, demand fees, and time-of-use pricing that swings between cheap overnight rates and expensive daytime peaks.
Because the load is continuous, small rate differences compound dramatically. The same rig that prints profit at 5 cents per kWh can bleed money at 15 cents. This is why miners obsess over stranded energy, flared gas, curtailed grid power, and any source where the marginal Electricity Cost approaches zero.
Why efficiency changes the math
The bridge between electricity cost and hashrate is efficiency (J/TH) — joules of energy spent per terahash of work. A more efficient machine produces the same hashing for fewer watts, so it survives at a higher rate per kWh before hitting break-even. Modern hardware built on chips like the BM1370 pushes efficiency far lower than older silicon, which is why an aging unit may stop paying for its own power long before it physically fails.
You can also shift efficiency yourself. Undervolting and underclocking trade raw hashrate for better J/TH, lowering your electricity cost per unit of work. Note that voltage adjustment on these machines happens per voltage domain, not per individual chip, so tuning targets a whole region of the board at once.
Why a home miner cares
For a sovereign miner running gear in a garage or basement, electricity cost is the difference between a hobby that pays for itself and one that quietly drains your wallet. Knowing your rate lets you size loads to your power circuit, decide between a 240V outlet and standard household power, and choose a tuning target that fits your budget rather than chasing maximum hashrate.
There is a clever way to claw the cost back. When an ASIC mines, nearly all the electricity it consumes becomes heat. If that heat displaces a furnace or electric baseboard you would have run anyway, the effective electricity cost of mining drops sharply — you were going to pay to heat the room regardless. This is the logic behind space heater mining and broader heat recovery setups. For Canadians weighing local rates and a long heating season, the Bitcoin mining in Canada guide walks through how this plays out in practice.
Managing it with firmware and scheduling
An open tuning stack and custom firmware can make electricity cost an active dial rather than a fixed bill. Board-level power metering reports true watt draw, scheduling lets you mine hard during cheap overnight windows and ease off during peak pricing, and electricity-price awareness can curtail intensity automatically when rates spike. Combined with knowing your machine’s firmware-tuned efficiency, this turns a passive expense into something you steer — one more layer of control handed back to the operator. Tools like the DCENT_OS tuning project (currently in closed beta, GPL-3.0, public beta planned for summer 2026) aim to expose exactly these levers.
Related terms: Efficiency (J/TH), Break-Even, Mining Profitability, Hash Price, Stranded Energy, Space Heater Mining
In Simple Terms
The cost of power for mining, measured in $/kWh. The biggest ongoing expense, varying greatly by location.
Electricity Cost is the price you pay for the energy an ASIC consumes while mining, normally expressed per kilowatt-hour (kWh). It is the single largest recurring expense in Bitcoin mining and the number that decides whether a machine earns more than it burns.
Also known as: power cost, energy cost, electricity rate ($/kWh).
How electricity cost is calculated
A miner draws a steady load measured in watts at the wall. Multiply that load by the hours it runs to get kilowatt-hours, then multiply by your rate. A machine pulling roughly 3,000 watts running all month consumes about 2,160 kWh; at 10 cents per kWh that is about $216 in power alone. Your real number depends on local tariffs, which often layer in delivery charges, demand fees, and time-of-use pricing that swings between cheap overnight rates and expensive daytime peaks.
Because the load is continuous, small rate differences compound dramatically. The same rig that prints profit at 5 cents per kWh can bleed money at 15 cents. This is why miners obsess over stranded energy, flared gas, curtailed grid power, and any source where the marginal Electricity Cost approaches zero.
Why efficiency changes the math
The bridge between electricity cost and hashrate is efficiency (J/TH) — joules of energy spent per terahash of work. A more efficient machine produces the same hashing for fewer watts, so it survives at a higher rate per kWh before hitting break-even. Modern hardware built on chips like the BM1370 pushes efficiency far lower than older silicon, which is why an aging unit may stop paying for its own power long before it physically fails.
You can also shift efficiency yourself. Undervolting and underclocking trade raw hashrate for better J/TH, lowering your electricity cost per unit of work. Note that voltage adjustment on these machines happens per voltage domain, not per individual chip, so tuning targets a whole region of the board at once.
Why a home miner cares
For a sovereign miner running gear in a garage or basement, electricity cost is the difference between a hobby that pays for itself and one that quietly drains your wallet. Knowing your rate lets you size loads to your power circuit, decide between a 240V outlet and standard household power, and choose a tuning target that fits your budget rather than chasing maximum hashrate.
There is a clever way to claw the cost back. When an ASIC mines, nearly all the electricity it consumes becomes heat. If that heat displaces a furnace or electric baseboard you would have run anyway, the effective electricity cost of mining drops sharply — you were going to pay to heat the room regardless. This is the logic behind space heater mining and broader heat recovery setups. For Canadians weighing local rates and a long heating season, the Bitcoin mining in Canada guide walks through how this plays out in practice.
Managing it with firmware and scheduling
An open tuning stack and custom firmware can make electricity cost an active dial rather than a fixed bill. Board-level power metering reports true watt draw, scheduling lets you mine hard during cheap overnight windows and ease off during peak pricing, and electricity-price awareness can curtail intensity automatically when rates spike. Combined with knowing your machine's firmware-tuned efficiency, this turns a passive expense into something you steer — one more layer of control handed back to the operator. Tools like the DCENT_OS tuning project (currently in closed beta, GPL-3.0, public beta planned for summer 2026) aim to expose exactly these levers.
Related terms: Efficiency (J/TH), Break-Even, Mining Profitability, Hash Price, Stranded Energy, Space Heater Mining