District Heating & Cooling Networks: Unlocking thermal decarbonization

Heating and cooling account for around 50% of final energy consumption in Europe, making the thermal sector one of the largest and hardest segments of the energy system to decarbonize. Unlike electricity, thermal demand has historically relied on fragmented building-level solutions and fossil fuels, limiting the pace and scale of the transition. In this context, District Heating and Cooling Networks (DHCNs) are emerging as a structural solution: by centralizing production and distributing thermal energy through dedicated networks, they enable the integration of renewable energy, waste heat recovery, and high-efficiency technologies that are often not viable at individual building level.

The European DHC market is entering a phase of renewed growth and transformation. Europe hosts more than 19,000 DHCN, supplying heat to over c.80 million people and producing around 550 TWh per year. The sector is also progressively decarbonizing, with renewable energy sources accounting for around 41% of total district heat supply in 2024. While mature markets in Northern and Eastern Europe are focused on decarbonization and optimization, Western and Southern European countries are expanding from a smaller base, supported by urban density, public policy, and the need for more efficient thermal infrastructure.

Within this context, Spain stands out as an emerging market with significant long-term potential. The sector has grown steadily to 585 networks and more than 1,753 MW of installed capacity in 2025, with strong momentum in biomass-based systems and tertiary-sector applications. However, penetration remains limited and the market still faces barriers such as administrative complexity, fragmented project scale, limited market awareness, and lower heating demand than in Northern Europe. At the same time, Spain offers differentiated growth potential through district cooling, hybrid thermal networks, and renewable and residual heat sources.

DHCNs offer a compelling value proposition for multiple stakeholders. For operators and utilities, they provide a scalable platform to integrate low-carbon heat sources across residential, tertiary, and industrial demand. For public authorities, they support urban decarbonization, energy security, and broader energy policy objectives. For investors, they combine long-life infrastructure characteristics with service-based revenues, contractual visibility, and strong alignment with decarbonization and ESG priorities. This value proposition is being reinforced by low-temperature and 5th Generation District Heating and Cooling (5GDHC) systems, as well as by digitalization through advanced monitoring, digital twins, big data, and AI-based optimization.

Looking ahead, the development of district heating and cooling in Europe and Spain will depend on coordinated action across planning, regulation, investment, and technology. Key priorities include embedding DHCNs in urban and energy planning, accelerating advanced and hybrid technologies, and developing district cooling as a strategic growth vector. As the sector matures, DHCNs are well positioned to become an increasingly relevant pillar of long-term thermal decarbonization in both Europe and Spain.