Energy systems across Europe are under pressure. As more renewables connect to the grid and heating and transport electrify, the question is no longer if we need flexibility — but where it should come from. Increasingly, the answer lies in our buildings.
While the UK is still developing its frameworks for flexibility in smart buildings, France is already showing what that future looks like. In Normandy, Voltalis has helped the Syndicat Départemental d’Énergies de la Manche (SDEM50) transform its new headquarters into a living model of energy intelligence — one that doesn’t just consume power efficiently but actively supports grid stability.
For UK sustainability and energy leaders, this project shows that flexibility in smart buildings isn’t theoretical. It’s working today, at scale, and it’s shaping how the next generation of energy systems will operate.
A public building designed to lead by example
SDEM50 coordinates energy strategy for 441 municipalities across the Manche region, overseeing procurement, renewables, and grid modernisation. When building its new headquarters in Saint-Lô, the goal was clear: create a positive-energy building that demonstrates what’s possible when digital management and renewable generation work hand in hand.
“The new SDEM headquarters was designed to be exemplary — a model for renewable energy integration and intelligent control.”
– Director, Pascal Deboislorey
That vision led to a 1,000 m² site that embodies flexibility in smart buildings:
- On-site solar generation covers most daily consumption.
- Battery storage captures surplus power for use when needed.
- Smart control systems optimise comfort and efficiency in real time.
- Grid-interactive design enables export of clean energy back to the network.
The building has achieved both R2S 1★ (Ready2Services) and 4GRIDS certifications — the first in France to do so — recognising its digital readiness and flexibility performance.
Where Voltalis adds value
Voltalis was chosen to integrate its flexibility technology directly with the building’s Schneider Electric GTB (building management system) and Microgrid Advisor platform. The result is a closed-loop system capable of autonomous energy decisions.
At the core sits Voltalis’ AI-driven flexibility agent, which analyses live data from both the building and the grid, making micro-adjustments to balance comfort, efficiency, and system stability.
In action:
- During national peaks, the system can discharge a few kWh from the battery to ease grid strain.
- When solar output exceeds demand, power is stored or reinjected into the grid.
- When supply tightens, non-critical loads can pause automatically.
This combination of automation and intelligence demonstrates flexibility in smart buildings at its most effective — seamless, invisible, and beneficial to all.
Early results from SDEM50 show that automated flexibility events can offset up to 10% of daily demand fluctuations, offering a glimpse of how aggregated buildings could stabilise local grids.
A step change for building flexibility
Until now, flexibility has been largely associated with industry or distributed household networks. Embedding it within complex commercial buildings marks a new phase.
By integrating demand-side control with a building’s own optimisation systems, Voltalis’ approach ensures that flexibility in smart buildings enhances — rather than disrupts — existing comfort and performance goals. The AI learns behavioural patterns, forecasts grid needs, and acts precisely when the building can offer the most value.
This makes SDEM50 one of the first real-world examples of flexibility being designed in, not bolted on.
Why it matters for the UK
The UK is moving in the same direction. Smart meters, local flexibility markets, and building standards such as NABERS UK and BREEAM In-Use are laying the foundation for widespread flexibility in smart buildings.
France’s experience shows what happens when policy, technology, and intent align:
- Flexibility that’s automated, not manual.
- Integration that’s built into existing systems, not retrofitted.
- Value that’s shared between consumers, suppliers, and the grid.
For housing providers, local authorities, and sustainability teams, the lesson is clear — the technology is ready, and the benefits are measurable.
A blueprint for Europe’s next-generation buildings
The SDEM50 project may be based in Normandy, but its implications stretch across Europe.
As electrification accelerates and renewables expand, every building that can store, shift, and share energy will strengthen the system as a whole.
With over 250,000 buildings already connected to Voltalis’ technology, the company is demonstrating how flexibility in smart buildings can scale across markets — supporting grid stability, reducing emissions, and making energy systems more resilient.
As the UK prepares for new market reforms and regional flexibility schemes, the SDEM50 example offers a clear vision of what’s achievable when innovation moves from concept to construction.
