The IEA DHC Annex XIV FlexVal one‑pager presents four key messages about the role of flexibility in future district heating (DH) systems. First, flexibility is becoming a core feature, emerging from coordinated use of thermal storage, demand response, heat pumps, electric boilers, combined heat and power, low‑temperature operation and smart control, driven by rising variable renewable electricity and heat electrification. Second, the value of DH flexibility must be assessed systemically and locally, as it depends on the surrounding energy system, electricity market conditions, taxation, regulation and existing infrastructure; modelling shows benefits vary by context and year, requiring case‑specific analysis. Third, buildings are a central enabler: improved building‑level controls, digital diagnostics, lower return temperatures and advanced domestic hot‑water substations can support low‑temperature DH without extensive retrofits, but tariffs, ownership models and incentives must align for all stakeholders. Fourth, flexibility should be integrated early in planning, network design and pricing, as early smart‑control and peak‑shaving assumptions can reduce over‑dimensioning and total system costs, while appropriate pricing mechanisms steer operators and customers toward efficient operation. The brief directs readers to the project website for further details.
Topics
Flexibility as a Core Feature of Future District Heating
Flexibility arises from coordinated use of thermal storage, demand response, heat pumps, electric boilers, CHP, low‑temperature operation and smart system control.
Systemic and Local Assessment of Flexibility Value
The value of flexibility depends on energy system context, electricity market conditions, taxation, regulation and existing DH infrastructure; modelling shows variable cost and robustness benefits.
Buildings as Key Enablers of Low‑Temperature, Flexible DH
Building‑level controls, digital diagnostics, lower return temperatures and advanced hot‑water substations enable flexibility, but require aligned tariffs, ownership models and incentives.
Early Integration of Flexibility in Planning, Design and Pricing
Incorporating flexibility early reduces over‑dimensioning, lowers system costs, and pricing mechanisms can steer efficient operation across the value chain.
Systemic and Local Assessment of District Heating Flexibility
The value of flexibility depends on the surrounding energy system, electricity market conditions, taxation, regulation, and existing DH infrastructure; modelling shows benefits vary by context and operational year, highlighting the need for case‑specific analysis.
Buildings as Key Enablers of Low‑Temperature Flexible District Heating
Demand‑side measures such as improved building‑level control, digital diagnostics, lower return temperatures, and advanced domestic hot‑water substations enable low‑temperature DH, but require aligned tariffs, ownership models, and incentives for building owners, tenants, and DH operators.
Early Integration of Flexibility in Planning, Design, and Pricing
Integrating flexibility early in system planning, network design, and business model development reduces over‑dimensioning and total system costs; smart control and peak‑shaving assumptions, together with appropriate pricing mechanisms, steer operators and customers toward efficient operation.