How Tallinn Reinvented District Heating: From Fossil Dependency to a Resilient Renewable Energy System

Less than two decades ago, Tallinn’s district heating system was almost entirely dependent on imported natural gas. Today, 90% of the city's district heating is already produced from renewable and recovered energy sources. By replacing imported fossil fuels with local energy sources, Tallinn has made decarbonisation and energy security part of the same strategy. This case study explores how Tallinn has transformed its existing district heating infrastructure into a modern and flexible urban energy system, integrating innovative solutions such as large-scale heat pumps, thermal storage and sector coupling. The result is a cleaner and more resilient system, less exposed to imported fuel dependency and price volatility, while ensuring reliable and affordable heat for the city. Tallinn’s experience demonstrates how cities can move towards fully fossil-free heating while strengthening their energy independence.