Electricity Price Arbitrage with Bitcoin Mining

March 9, 2026 · 6 min read

Electricity prices fluctuate – sometimes drastically. What's frustrating for households is an opportunity for Bitcoin miners: Through strategic arbitrage, you can drastically reduce your effective electricity cost.

The Spot Market: Prices by the Second

At the electricity exchange (EPEX Spot), prices change hourly:

• Night (2-5 AM): Often below 3 ct/kWh
• Midday (summer): Sometimes negative (PV surplus)
• Evening (6-8 PM): Peak, up to 30 ct/kWh
• Storm/calm: Extreme fluctuations possible

The Arbitrage Strategy

The principle is simple: Mine when electricity is cheap. Pause when it's expensive.

• Set threshold: e.g., "Mine only below 8 ct/kWh"
• Automation: Software switches based on price signal
• Leverage flexibility: No penalty for interruption

In the above example, the miner would run ~12 hours at an average of 4.5 ct/kWh instead of 24 hours at 11.6 ct/kWh.

Access to the Spot Market

As a private individual or small business, you have several options:

1. Dynamic Electricity Tariffs

• Tibber, aWATTar, Ostrom, Rabot Charge
• Hourly billing
• Automation via smart home/API

2. Direct Exchange Access

• Makes sense from ~100 MWh/year
• Via energy trader or aggregator
• More complex, but maximum control

Technical Implementation

For automatic arbitrage you need:

• Price data API: e.g., from aWATTar or ENTSO-E
• Control software: Node-RED, Home Assistant, custom script
• Switchable outlet: Tasmota, Shelly, or direct miner control

Example logic:

• Every hour: Retrieve price
• If price < threshold → Miner on
• If price > threshold → Miner off
• Optional: Moving average for stability

Example Calculation

Assumption: 3 kW miner

Without arbitrage (24/7 operation):

• 72 kWh/day × €0.12 = €8.64/day electricity costs
• Mining revenue: ~€9.50/day
• Profit: €0.86/day

With arbitrage (12h/day during cheap electricity):

• 36 kWh/day × €0.05 = €1.80/day electricity costs
• Mining revenue: ~€4.75/day (half time)
• Profit: €2.95/day

Result: Despite half the mining time, almost triple the profit!

Negative Electricity Prices

Particularly interesting: Negative prices. Yes, sometimes you get paid for consuming electricity:

• 2024: Over 300 hours with negative prices
• Record: €-0.50/kWh (you receive 50 cents per kWh)
• Typical: €-0.01 to €-0.05/kWh

At negative prices, you earn double: Bitcoin PLUS electricity compensation.

Risks and Limitations

• Grid fees: Remain fixed, even with negative prices
• Minimum purchase: Some tariffs have minimum quantities
• Hardware stress: Frequent on/off (not a problem for ASICs)
• Forecast uncertainty: Day-ahead prices can deviate from actual

Optimization: Heat as Buffer

Even smarter: Heat storage as buffer:

• During cheap electricity: Full heating + storage
• During expensive electricity: Draw from storage
• Result: Continuous heat despite intermittent mining

Conclusion

Electricity price arbitrage is one of the biggest levers for profitable mining. The volatility of the electricity market, which others see as a problem, becomes a revenue source. Automation is key – once set up, the system optimizes autonomously.