Mining cryptocurrency is a capital-intensive business where profitability hinges on a single factor: electricity cost relative to coin price.
A miner with cheap electricity can profit from old hardware. A miner with expensive electricity cannot profit even with cutting-edge equipment.
Yet most mining calculators emphasize hashrate (computing power) while downplaying electricity cost—creating the false impression that hardware quality is the primary profitability driver.
The Mining Profitability Formula
Net Daily Profit = (Daily BTC Output × BTC Price) - (Daily Electricity Cost)
This simple formula reveals everything:
Daily BTC Output:
Based on hashrate and current mining difficulty. Higher hashrate = more BTC
Daily Electricity Cost:
Daily Electricity Cost = Power Consumption (Watts) × 24 hours ÷ 1,000 × Electricity Rate ($/kWh)
Example calculation:
- Antminer S19 Pro+: 120 TH/s hashrate, 5,445W power
- Bitcoin price: $100,000
- Electricity cost: $0.075/kWh (global average for miners)
- Daily BTC output: ~0.0032 BTC (varies by difficulty)
- Daily electricity cost: 5,445 × 24 ÷ 1,000 × $0.075 = $9.80/day
- Daily revenue: 0.0032 × $100,000 = $320/day
- Daily profit: $320 - $10 = $310/day
This looks profitable at $310/day. But change one variable dramatically:
How Electricity Cost Dominates Profitability
Same hardware, different electricity rates:
Scenario A: $0.04/kWh electricity (cheap, Iceland/hydropower)
- Daily electricity cost: 5,445 × 24 ÷ 1,000 × $0.04 = $5.20/day
- Daily profit: $320 - $5.20 = $314.80/day
Scenario B: $0.12/kWh electricity (expensive, some US locations)
- Daily electricity cost: 5,445 × 24 ÷ 1,000 × $0.12 = $15.60/day
- Daily profit: $320 - $15.60 = $304.40/day
Scenario C: $0.20/kWh electricity (very expensive, Australia/some US)
- Daily electricity cost: 5,445 × 24 ÷ 1,000 × $0.20 = $26/day
- Daily profit: $320 - $26 = $294/day
All three are still profitable, but the $0.20/kWh miner makes 6% less profit for identical hardware.
Now change the coin price:
If Bitcoin drops to $40,000:
- Daily revenue: 0.0032 × $40,000 = $128/day
- At $0.04/kWh: $128 - $5.20 = $122.80/day (profitable)
- At $0.12/kWh: $128 - $15.60 = $112.40/day (profitable but thin)
- At $0.20/kWh: $128 - $26 = $102/day (marginal, approaching break-even)
The electricity-dependent miners start unplugging equipment at lower prices.
The Profitability Threshold: Where Mining Becomes Unprofitable
Global average mining electricity cost is $0.05/kWh according to Cambridge Bitcoin Electricity Consumption Index:
Profitability threshold calculation:
Miners only operate when: Revenue ≥ Electricity Cost
Using the profitability inequality:
Daily BTC Output × Bitcoin Price ≥ Daily Electricity Cost
For an S19 Pro+ at $0.075/kWh:
0.0032 BTC × Bitcoin Price ≥ $10/day
Bitcoin Price ≥ $3,125
Below $3,125 BTC price, the S19 Pro+ is unprofitable at $0.075/kWh electricity
Yet with $0.04/kWh electricity:
Bitcoin Price ≥ $1,625
The cheaper electricity miner remains profitable at Bitcoin prices that force other miners offline
Real-World Implication: Why Large Mining Operations Relocate
Large mining operations don't prioritize newest hardware—they prioritize electricity cost:
Why miners use older hardware:
- Older ASICs cost less upfront
- Electricity cost over miner lifespan dominates total cost
- Old hardware in $0.04/kWh location beats new hardware in $0.15/kWh location
- Payback period improves with cheap electricity, not new hardware
Why mining farms relocate to Iceland, China, Georgia:
- Iceland: Geothermal power = $0.04-0.06/kWh
- China: Coal power historically = $0.03-0.05/kWh (now restricted)
- Georgia: Hydropower = $0.05-0.07/kWh
- These savings compound across thousands of machines
A 1,000-miner farm operating at $0.04/kWh vs. $0.12/kWh saves $240,000/day in electricity.
The Impact of Mining Difficulty
Mining difficulty adjusts every 2 weeks based on total network hashrate:
When many miners plug in:
- Difficulty increases
- Hashrate reward per miner decreases
- Daily BTC output per miner drops
This is deflationary to mining profitability:
Example:
- When BTC = $100,000, miners plug in equipment
- Hashrate increases 20%
- Difficulty increases 20%
- Daily BTC output per miner drops from 0.0032 to 0.0027
- Profitability drops 15-20%
- Expensive-electricity miners unprofitable first
This creates a self-regulating cycle: As price rises, miners turn on. Difficulty rises. Cheap-electricity miners stay profitable longest.
Payback Period: The Real Investment Metric
Payback period = Total Hardware Cost ÷ Daily Profit
S19 Pro+ hardware cost: ~$2,395 (highly variable)
Payback period calculations:
- At $0.075/kWh, $310/day profit: 2,395 ÷ 310 = 7.7 days payback
- At $0.12/kWh, $304/day profit: 2,395 ÷ 304 = 7.9 days payback
- At $0.20/kWh, $294/day profit: 2,395 ÷ 294 = 8.2 days payback
But if Bitcoin drops to $60,000:
- Daily profit drops from $310 to $200
- Payback period: 2,395 ÷ 200 = 12 days
- At high electricity costs and low Bitcoin price: Could exceed 30+ days
Payback period of 7-10 days assumes favorable conditions. Real payback periods are often 15-30+ days depending on:
- Electricity cost
- Bitcoin price when you buy hardware
- Mining difficulty at that time
- Hardware lifespan degradation
The Real-World Trade-off: Cheap Electricity vs. Capital Investment
Location A: Iceland ($0.05/kWh)
- High upfront: $2,500 hardware + $10,000 relocation costs
- Low operating: $5/day electricity
- High profit: $315/day
- Payback: 40 days
Location B: Home ($0.12/kWh)
- Low upfront: $2,500 hardware only
- High operating: $15/day electricity
- Low profit: $305/day
- Payback: 8 days
- But profitability drops quickly at lower Bitcoin prices
Large-scale miners choose Location A (high upfront, cheap electricity) because electricity dominates over time.
Home miners might choose Location B (low upfront, high electricity) if they want quick ROI and accept lower long-term margins.
Actionable Mining Economics Framework
Before buying mining hardware, calculate:
- Your local electricity cost (ask your utility or estimate from bill)
- Current Bitcoin price (will change—model scenarios)
- Current mining difficulty (will change—assume +20% quarterly)
- Hardware payback period at current conditions
- Break-even Bitcoin price for profitability
- Monthly profit at current price vs. pessimistic scenario
Break-even Bitcoin price:
Break-even Price = Daily Electricity Cost ÷ Daily BTC Output
If this calculation shows Bitcoin must stay above $50,000 for profitability, and you're uncertain Bitcoin will stay that high, skip mining.
The Bottom Line: Electricity Cost is Everything
You cannot overcome high electricity cost with better hardware.
A $5,000 cutting-edge miner at $0.20/kWh loses money. A $2,000 used miner at $0.04/kWh prints money.
The mining industry's consolidation to cheap-electricity regions (Iceland, China, Georgia) proves this: Geography beats hardware
For individual miners considering home mining, the unfavorable electricity cost in most locations makes profitability marginal or negative.
The only viable path to mining profitability for individuals: Cheap electricity access (not home mining unless you have hydro/solar generation)