Hamburg has adopted a heat plan aimed at achieving a climate-neutral heat supply by 2040. The plan is based on federal heat planning legislation and Hamburg’s own climate targets. District heating networks are intended to cover 57 percent of heating demand in the future, yet they will still only serve a portion of the city’s buildings. Consequently, around 200,000 houses will require a decentralized solution—typically a heat pump. The current pace of expansion lags significantly behind what is required. Property owners must therefore anticipate high investment costs, long planning periods, and potential bottlenecks in the electricity grid.
Heat plan envisages 22,000 additional grid connections
The plan is intended to provide property owners, businesses, and grid operators with spatial guidance. However, the published map does not guarantee a future district heating connection. While densely built-up urban areas are frequently designated for heating networks, many outlying areas will continue to rely on independent heating systems. Property owners must therefore check with the relevant grid operator before making an investment.
Image: ©Hamburger Energiewerke
District heating networks currently supply just under 35,000 buildings in Hamburg. Plans are in place to connect approximately 22,000 additional buildings by 2040. However, achieving this would require the city to construct around 70 kilometers of new pipelines annually. Furthermore, industrial waste heat, large-scale heat pumps, and energy parks are intended to increasingly replace fossil fuels.
Heat pumps must be installed much faster
The heating plan estimates around 13,400 system conversions per year for decentralized supply. Consequently, heat pumps are slated to replace oil or gas heating systems in many buildings. Yet, by the end of May 2026, only 9,325 heat pumps had been registered with Hamburg’s energy grid operators. This means the current stock already falls short of the calculated annual volume required.
Between January and May 2026, 1,214 new units were installed, compared to 487 during the same period the previous year. While the market is growing, the pace is insufficient to meet the 2040 target. Green Party politician Melanie Nerlich therefore considers an “eightfold increase in the current installation rate” to be necessary.
Grid constraints and costs limit the pace of expansion
An increase in heat pumps drives up electricity demand, particularly in residential areas dominated by single-family homes. Consequently, grid operators must upgrade power lines, local distribution substations, and transformer stations. Furthermore, the heat plan exceeds previous forecasts regarding the future supply structure. Integrated energy infrastructure planning is therefore intended to determine which upgrades are feasible in terms of both technology and timing.
Property owners also face financial and legal uncertainties. Hamburg continues to mandate a share of renewable heat when heating systems are replaced, even as the federal government prepares to amend its own regulations. Consumer protection agencies warn of conflicting signals and the risk of making poor decisions. While subsidy programs can reduce investment costs, they are no substitute for reliable information regarding district heating, grid capacity, and technical suitability.
Author: Blackout News
Sources: Welt (16.06.26) – Hamburg (16.06.26) – Verbraucherzentrale Hamburg (31.03.26) – Hamburger Energiewerke (Stand: 16.06.26)