Monetize Solar Surplus with Bitcoin Mining

January 30, 2026 · 5 min read

Many countries face a luxury problem: Too much solar power. On sunny days, PV systems produce more energy than the grid can absorb. The result? Systems are curtailed – with no compensation for the operator.

In 2024, over 8 TWh of renewable electricity was curtailed in Germany alone. That's equivalent to the annual consumption of 2 million households. Waste on a massive scale.

The Problem: Grid Full, System Off

As a PV system owner, you know this: The sun shines, your system runs at full capacity – and then comes curtailment. The grid operator shuts you down because the grid can't absorb the energy.

• No compensation for curtailed power
• Grid expansion takes years
• Battery storage is expensive and limited
• Feeding in at negative prices makes no sense

The Solution: Bitcoin Mining as Flexible Load

Bitcoin miners are the perfect complement for solar systems:

How It Works in Practice

1. Detect surplus: A simple sensor measures when your PV system produces more than house and grid can absorb.

2. Start miner: The Bitcoin miner automatically starts and converts surplus into Bitcoin.

3. Use heat: The miner's waste heat (95% of energy) heats your water, pool, or workshop.

4. Shut down when needed: As soon as surplus drops or grid becomes receptive again, the miner shuts off.

Economics: An Example

Assume you have a 30 kWp PV system and 4 hours daily surplus averaging 10 kW:

• Daily surplus: 40 kWh
• Annual surplus: ~14,600 kWh
• Mining yield (conservative): ~0.00001 BTC/kWh
• Annual yield: ~0.15 BTC
• At $80,000/BTC: ~$12,000/year

Plus: Waste heat replaces heating energy worth another $1,000-2,000.

What You Need

• Miner: A modern ASIC miner (e.g., Antminer S19) for $2,000-4,000
• Controller: Raspberry Pi or Node-RED for automation
• Heat exchanger: Optional, for hot water integration
• Internet: Minimal data usage (~100 MB/month)

Conclusion

Bitcoin Mining isn't a gimmick – it's the most economical way to monetize surplus solar power. While others wait for grid expansion, you're already earning from every sunray.