Electricity is 90% of mining economics
Hardware, space, and labor each account for 5-10% of total mining cost. Electricity accounts for 80-90%. Your power rate is the single most important variable in whether mining makes money. A rig that's profitable at $0.05/kWh can be deeply unprofitable at $0.12/kWh for the exact same hash rate and exact same Bitcoin price. This calculator puts a precise annual number on the electricity side so you can compare it directly to expected mining revenue. Use our mining profitability calculator for the full revenue picture.
Real-world wattage vs nameplate
The Antminer S21 is rated at 3,500W nameplate. Actual wall draw after power supply losses is 3,550-3,650W. Add 10-15% for cooling (fans, HVAC, immersion pumps) and your effective draw is closer to 4,000W. Always budget 10-20% above nameplate for real planning. A 10-rig farm nameplated at 35kW actually draws 40-42kW — which matters for circuit sizing, generator backup, and utility contract negotiation.
Electricity rates around the US
Residential: $0.10-0.30/kWh depending on state. Texas residential: ~$0.12. California: $0.25-0.40. Commercial: $0.08-0.15. Industrial (500kW+ contract): $0.04-0.08. Curtailment programs (Texas ERCOT, PJM): $0.02-0.06 effective when you flex off during peaks. The gap between residential and industrial explains why nearly all profitable mining happens in industrial facilities with direct utility contracts, not basements. For hobbyists, cost of power is usually disqualifying.
Natural gas flaring and stranded power
The cheapest electricity in the world goes to Bitcoin miners: waste natural gas that would otherwise be flared off at oil wells. Companies like Crusoe and JAI Energy capture the gas, run generators, and sell the electricity to their own ASICs at $0.01-0.03/kWh effective. Hydroelectric curtailment (excess water in Oregon, Washington, British Columbia) and geothermal (Iceland, Kenya) offer similar rates. If you're serious about mining, you're chasing this kind of power — not paying retail.
Uptime and heat management
Real-world uptime on well-run mining operations is 95-99%. Downtime comes from firmware issues, pool connectivity, power outages, and heat throttling. Uptime below 95% is a red flag for facility problems. Temperature is the silent killer — ASICs throttle performance above 75°C ambient and fail prematurely. Industrial miners run at 18-25°C with forced airflow or liquid immersion, which is why they hit 99% uptime.
Hosted mining: electricity at industrial rates
Hosting services (Compass Mining, Blockware, Luxor) let retail investors deploy ASICs at industrial facilities for $0.065-0.09/kWh all-in. You buy the ASIC, they host and operate it, you pay a monthly fee. This bridges the rate gap for hobbyists. Do diligence: some hosts have folded during bear markets, stranding customer rigs.
Cooling overhead
Air cooling: 10-20% electricity overhead (HVAC, intake fans). Immersion cooling: 3-8% overhead but $500-2,000 upfront per rig. Hydro-cooling (direct-to-chip liquid): 5-10% overhead, similar upfront cost to immersion. In hot climates, cooling can approach 30% overhead in summer — which can flip summer months into unprofitable operation. Calculate cooling by season, not as a single annual number.
The buy-vs-mine decision
For most retail investors, just buying the coin has beaten mining on a risk-adjusted basis for most of the last 5 years. You avoid hardware depreciation, electricity rate risk, operational downtime, and tax complexity. Mining makes sense when you have access to sub-$0.06/kWh power, can operate at scale, and have a multi-year conviction. Otherwise, DCA into the coin and skip the noise. Our dollar-cost averaging calculator runs that alternative.