For many property owners, energy has traditionally been treated as a cost to be managed once a month through bills, contracts and efficiency measures. That is changing. As electricity systems become more renewable, more electrified and more capacity-constrained, buildings are becoming active parts of the energy system.
The question is no longer only how much energy a building uses. Increasingly, the question is also when it uses energy, how fast demand changes, and whether the building can shift part of its load without affecting comfort, operations or tenant experience.
This is the core idea behind energy flexibility.
What does energy flexibility mean?
Energy flexibility means the ability to adjust, shift, store or optimise energy use in response to electricity prices, grid conditions, weather, renewable generation and building demand. In practice, this can mean using more electricity when it is cheap or abundant, using less when the grid is stressed, storing energy for later use, or coordinating different assets such as solar PV, batteries, heat pumps, EV chargers and thermal storage.
The Swedish Energy Agency describes flexibility as an important part of a secure, efficient and sustainable energy system. A flexible system can better handle variation in production and demand, use the grid more efficiently and support a higher share of renewable energy.
For a property owner, this means that the building can move from being a passive consumer to becoming a controllable energy asset.
Why flexibility is becoming important for property owners
There are several reasons why energy flexibility is becoming more relevant for commercial buildings, real-estate portfolios and local energy hubs.
1. Electricity prices are becoming more dynamic
With more wind and solar power in the system, electricity prices can vary significantly between hours. A building that can shift part of its demand from expensive hours to cheaper hours can reduce exposure to price volatility. This does not require reducing comfort. It requires smarter timing, storage and control.
2. Grid capacity is becoming a local constraint
Many regions face grid-capacity limitations. Even if annual electricity use is reasonable, short peak periods can create high costs and capacity challenges. For property owners, managing peak demand can become as important as reducing total energy consumption.
3. Solar PV needs better self-consumption
A building with rooftop solar may produce electricity at times when the building cannot use it directly. If surplus electricity is exported at low value while the building later imports electricity at higher cost, part of the local value is lost. Flexibility allows more of the locally produced electricity to be used on site.
4. EV charging adds new peaks
Electric vehicle charging can be valuable for tenants and visitors, but unmanaged charging can increase peak loads. Smart charging can shift part of this demand to better hours, coordinate with solar production and avoid unnecessary grid stress.
5. Heating is a major flexibility opportunity
Buildings often have thermal inertia. In simple terms, they can store heat for a period of time in the building structure, water tanks or dedicated thermal storage systems. This makes heating one of the most practical areas for flexibility, especially when combined with smart control and thermal energy storage.
Practical examples of flexibility in a building
Energy flexibility can sound abstract, but in buildings it usually comes down to practical actions:
- charging thermal storage when electricity is cheap or solar production is high,
- reducing electric heating or heat-pump load during expensive peak hours,
- charging EVs when grid load and electricity prices are lower,
- using batteries for fast electrical peak shaving,
- using thermal storage for longer-duration heat shifting,
- coordinating solar PV, storage, heating, ventilation and EV charging through smart control.
Svenska kraftnät gives simple examples of demand flexibility, such as charging an electric vehicle when electricity prices are low or reducing heat-pump operation when prices are high. For property owners, the same principle can be applied at building or portfolio level.
Why thermal storage is different from batteries
Batteries and thermal storage solve different problems. Batteries are strong for fast electrical response, short-term balancing and power quality. Thermal storage is strong when the final need is heat or cold, especially when larger amounts of energy must be stored at lower cost per stored thermal kilowatt-hour.
For a building, the best solution is often not battery versus thermal storage. It is a hybrid approach where each technology does what it does best: batteries handle fast electrical peaks, while thermal storage shifts heating or cooling demand over longer periods.
This is why the future of building energy flexibility will likely be based on coordinated systems, not isolated devices.
The business value for property owners
Energy flexibility can create value in several ways:
- Lower energy costs by shifting demand away from expensive hours.
- Reduced peak demand and better use of grid capacity.
- Higher solar self-consumption by storing surplus local generation.
- Improved energy resilience through storage and smarter operation.
- Lower emissions by using more renewable electricity and reducing fossil backup.
- Future readiness for dynamic tariffs, local flexibility markets and new grid requirements.
The European Commission has also highlighted the need for electricity markets to adapt to more renewable energy and attract investment in fossil-free flexible technologies such as demand response and energy storage. This means that flexibility is becoming part of the policy and market direction in Europe, not only a technical optimisation topic.
What data is needed to evaluate flexibility?
A useful flexibility assessment does not start with hardware. It starts with site data. For a commercial building or property portfolio, the most important inputs are:
- hourly or 15-minute electricity consumption,
- solar PV production, self-consumption and export data,
- heating and hot-water demand profile,
- electricity tariff and grid-fee structure,
- peak demand and capacity charges,
- EV charging plans or existing charging data,
- space and technical access for storage and integration,
- existing heating system and hydronic connection points.
With this information, it becomes possible to identify whether the site has a real flexibility case, what type of storage is relevant, and which value drivers are strongest.
When is a building a good candidate?
A building is usually a stronger candidate for flexibility when it has several of the following characteristics:
- significant heating or hot-water demand,
- solar PV with regular export to the grid,
- high electricity-price exposure,
- peak-demand charges or grid-capacity constraints,
- planned EV charging expansion,
- interest in reducing emissions and improving energy resilience,
- a property owner willing to use the building as a controlled validation environment.
Not every building needs advanced energy flexibility immediately. But for properties with local generation, heating demand, electrification plans and exposure to price or grid constraints, flexibility can become a strategic asset.
Conclusion
Energy flexibility is becoming a new layer of value for property owners. It connects cost control, solar self-consumption, grid efficiency, EV charging, heating optimisation and decarbonisation into one strategic question: how can the building use energy at the right time?
In the coming years, the most valuable buildings will not only be energy-efficient. They will also be flexible, controllable and able to interact intelligently with the wider energy system.
For property owners, energy flexibility is moving from a future option to a practical business opportunity.
References
- Swedish Energy Agency, Flexibilitet i energisystemet. https://www.energimyndigheten.se/energisystem-och-analys/energisystem-och-analys/flexibilitet-i-energisystemet/
- Svenska kraftnät, Om flexibilitet. https://www.svk.se/om-kraftsystemet/om-flexibilitet/
- European Commission, Electricity market design. https://energy.ec.europa.eu/topics/markets-and-consumers/electricity-market-design_en
- International Energy Agency, Flexibility – Electricity 2026. https://www.iea.org/reports/electricity-2026/flexibility
- European Commission, EU electricity trading in the day-ahead markets becomes more dynamic, 2025. https://energy.ec.europa.eu/news/eu-electricity-trading-day-ahead-markets-becomes-more-dynamic-2025-10-01_en