That's 0.07% of global energy use (comparable to many other random industries, and often using otherwise wasted/stranded energy). Its service is that it gives people an alternative for when the IMF comes and makes a deal with your country's govt to devalue your currency. 😉
IMF
IMF31.7.2025
Bitcoin consumes as much electricity as Argentina but isn't counted in GDP because it doesn't create traditional goods or services. The updated System of National Accounts classifies crypto assets as national wealth for better economic measurement. 
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