– In the cold expanses of Finland, where winters reach minus 30°C, crypto mining is becoming a source of heat for thousands of homes. Marathon Digital Holdings has announced the expansion of a project using waste heat from bitcoin farms to heat residential spaces. Now, the heat from the servers warms nearly 80,000 residents of the Satakunta region, while analysts estimate that overall mining heat serves up to 140,000 Finns – 2.5% of the country's population.
The project started in 2024 with 11 000 homes, but quickly expanded due to integration with district heating systems. Hot air from ASIC miners, such as WhatsMiner M63S, passes through heat exchangers, heating water to 70-80°C. This water flows through insulated pipes to homes, hospitals, and schools, replacing fossil fuels: coal (18%), peat (15%), and oil. Finland, where 69% of energy is still non-renewable, sees this as a path to carbon neutrality.
Hashlabs Mining, a partner of Marathon, has already connected three farms to the grid. "Mining is the best source of reliable hot water for heating," said co-founder Jara Mellered. This not only reduces CO2 emissions and the burden on infrastructure but also creates additional income for miners, stabilizing the business after the 2024 halving.
Finnish success inspires: from the Olkiluoto nuclear power plant to a complete transition to green energy. Crypto, once criticized for its energy consumption, now saves from the cold, making mining a part of the sustainability ecosystem.
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