What, then, for countries that do not have long-established roots with district heating? The most efficient way is to use heat sources that are available locally, says Jardfelt, such as datacentres or flue gases from waste incinerators. But, she warns, it depends on property owners being willing to replace their existing boilers with district heating plants that draw heat from hot water in the district heating network. “Do you dare to trust that you will really get the heat you need and at a reasonable price? This may require government price regulation.”
At Stockholm Exergi’s pioneering power station in Norra Djurgårdsstaden they burn forestry waste to produce district heating. The company, which is half-owned by the city of Stockholm, plans to build a bio-energy with carbon capture and storage (BECCS) plant close to the site to produce negative emissions. They have already set up a research facility there and calculate that there is potential to capture 800,000 tonnes of CO2 a year at the plant. If this was emulated across the city, they claim that figure could rise to 2m tonnes. “This is the beginning,” says Persson, a company spokesperson. “But we hope that lots of others will follow.”
But there is no perfect or permanent solution to energy transition, says Dzebo. “It requires constant reconfiguration and agile decision-making. But, often the trade-offs can be perceived as being too high.”