Densely populated areas in Finland are typically heated with district heating, rather than each house individually. https://en.m.wikipedia.org/wiki/District_he

Densely populated areas in Finland are typically heated with district heating, rather than each house individually. https://en.m.wikipedia.org/wiki/District_heating https://en.m.wikipedia.org/wiki/District_heating Right now the energy for district heating in Helsinki is a mix of fossil fuels and using waste sources of heat like data centre heat. Renewable energy sources are currently being evaluated for this, with deep geothermal (up to several kilometres deep) being one source. https://www.hel.fi/uutiset/en/helsinki/helen-investigates-possibilities-of-geothermal-heat-in-helsinki https://www.hel.fi/uutiset/en/helsinki/helen-investigates-po...