2010 Bitcoin Mining Estimates Revealed: $5.68 Electricity Cost for 50 BTC Reward

In 2010, Bitcoin miners estimated that mining a block using a 140-watt CPU would cost around $5.68 in electricity for an expected reward of 50 BTC.

This calculation reflected the probabilistic nature of mining, where the $5.68 was an expected cost over an average 14-day wait, not a guaranteed expense or profit.

The low market price and liquidity at the time made this operation a 'net loser.'

Since then, Bitcoin mining has evolved with specialized ASIC hardware and reduced block rewards, making home CPU mining uneconomical.