Household electricity in Bulgaria costs 13.6 cents per kilowatt-hour. That is rank 2 of 27 in Europe. What it means for a mining machine is below.
At 13.6 cents, 3 of the 85 machines pay off, and only the most efficient ones. The margin is thin: if network difficulty rises or the price falls, it tips. Which is why the usual route is a data centre: at around 8 cents in hosting, 57 machines pay off, and that is exactly where professional mining sits.
| Model | TH/s | J/TH | Net/day | Break-even |
|---|---|---|---|---|
| Antminer S23 Hyd 3U | 1,160 | 9.5 | +3.40 € | 14.9 ct |
| Antminer S23e Hyd 2U | 865 | 10.0 | +1.12 € | 14.1 ct |
| Antminer S23 Hydro | 563 | 10.0 | +0.73 € | 14.1 ct |
| Bitaxe Gamma 601 | 1.2 | 15.0 | -0.02 € | 9.4 ct |
| Bitaxe GT 800 | 2.4 | 14.6 | -0.03 € | 9.7 ct |
| NerdQaxe++ | 4.8 | 15.6 | -0.08 € | 9.0 ct |
| Bitaxe Supra Hex | 4.2 | 21.4 | -0.15 € | 6.6 ct |
| NerdOCTAxe | 9.6 | 16.7 | -0.20 € | 8.5 ct |
This figure is the pure electricity input needed to earn one whole bitcoin through the network, calculated with the most efficient machine in the comparison and the tariff above. Hardware, cooling, staff and downtime are not in it. If it sits above the bitcoin price, mining costs more than the result is worth.
Within Europe more than forty cents separate the cheapest household tariff from the dearest. That decides profit and loss far more sharply than any choice of machine. The neighbours by price:
Buy machines, grow hashpower, push power costs down. The same arithmetic as here, only without real money.
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