The energy debate

In plain words

Mining uses electricity on the scale of a mid-sized country. That's by design: the cost is what makes rewriting Bitcoin's history unaffordable. Critics call it waste and point at emissions. Supporters answer that miners chase the world's cheapest power — often surplus or renewable — can switch off instantly to help the grid, and that neutral money is worth the bill. The facts are mostly agreed; the fight is over values — what deserves energy.

Why it matters

• The most common outside criticism of Bitcoin — worth understanding first-hand.
• The energy IS the security: a cheap-to-attack money would be weak money.
• Miners can run anywhere and shut off instantly — unusual, and it shapes where mining happens.

Go deeper

• Proof of work
• Hashrate
• ASIC miners