Buildings that think ahead: shifting electricity use sensibly

Efficiency and flexibility are different tasks

Efficiency means providing a desired service with less energy. Flexibility, by contrast, concerns the timing of consumption and, where relevant, the power demand. A well-insulated home may need little energy for heating; it may also be possible to control the timing of its heat pump's operation within certain limits. The International Energy Agency describes grid-interactive buildings as a combination of an efficient envelope, electrified applications and digital controls. It remains important to assess these two contributions separately. Shifting consumption can support the electricity system even if the total energy used remains unchanged or increases slightly. Conversely, a lasting reduction in consumption is valuable even when it cannot be called upon flexibly. Good planning therefore begins by avoiding unnecessary loads and then examines which remaining uses can sensibly be shifted without compromising the building's use.

Not every load can be shifted at will

The most suitable uses are those that offer some flexibility in timing. These may include hot water production, thermal storage or charging a connected electric vehicle. However, room temperatures, hygiene requirements and the need for a vehicle to be ready on time impose limits. Controls must reliably account for these conditions and allow safe settings in the event of faults. Nor does the electricity grid automatically benefit when many devices respond to an identical price signal at the same time. This can create new peaks in consumption. Coordination that considers technical connection requirements as well as the energy supply is therefore sensible. Users should be able to see which function is currently being shifted and how they can intervene. A system that works only with constant manual readjustment may not deliver its theoretical benefits consistently in everyday use, or may do so only to a limited extent.

Data and comfort are part of the environmental assessment

Digital building technology requires sensors, communication and reliable software. This entails additional material and energy use, which should be justified by the benefits achieved. Data protection and long-term maintainability also matter: consumption data can reveal a great deal about how a building is used, while discontinued services can render a control system unusable. The IEA emphasises the role of connected controls for flexible heat pumps, rather than treating the most extensive possible automation as an end in itself. In practice, straightforward operating modes, documented settings and open connectivity options are often more important than a large number of digital functions. Success should be evident in measured results: appropriate comfort, understandable consumption and load shifting that can actually be used. A polished user interface alone demonstrates neither efficiency nor a positive contribution to integrating renewable energy.

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