The Helsinki Energy Challenge was a global competition launched by the City of Helsinki in 2020 to find innovative solutions for decarbonising the city's heating system. Helsinki aimed to phase out coal-fired district heating by 2029, and the challenge invited teams worldwide to propose scalable, carbon-neutral heating solutions for an urban environment with harsh Nordic winters.
The competition attracted over 250 registrations from more than 30 countries, with ten finalist teams selected to develop detailed proposals. The winning solutions combined multiple technologies including large-scale heat pumps utilising seawater and waste heat, seasonal thermal energy storage, deep geothermal energy, and smart demand-response systems integrated with Helsinki's extensive district heating network.
Managed by the City of Helsinki in partnership with energy company Helen Oy, the challenge exemplified an open innovation approach to urban energy transition. Its outcomes have directly informed Helsinki's carbon-neutral heating roadmap, positioning the city as a global leader in sustainable urban energy systems and providing replicable models for other northern European cities facing similar decarbonisation challenges.