Tomorrow's energy: when industrial buildings become energy producers
For over two centuries, coal, oil, gas, and then nuclear power have been the engine of our prosperity. Today, the context has changed: faced with climate challenges, the energy transition is no longer a simple ambition but a collective obligation, translated into regulations, building standards, and CO₂ emission reduction targets. Industrial buildings, long simple energy consumers, are now at the heart of this evolution.
From consumer to producer
The first step is always to consume less. A well-insulated, airtight building, bathed in natural light and equipped with high-performance equipment naturally uses less energy throughout its life, and every euro invested intelligently at the design stage generates savings for decades. But even the most energy-efficient buildings will always need electricity – lighting, production, IT, heating, air conditioning, charging stations. The question then becomes obvious: why not produce some of it on-site? It is this shift that transforms the building into an active participant in the energy system. Several technologies will contribute to this: wind power, which is promising but still complex to integrate into business parks, battery storage, whose costs are rapidly decreasing, and above all solar photovoltaics, which is today the simplest, most accessible, and most profitable solution.
The roofing, a productive asset
One only needs to look at the vast roofs of commercial buildings to understand their potential: where a home might accommodate a few dozen panels, an industrial building can have several hundred, or even several thousand square metres. Today, the economics of photovoltaics have transformed in twenty years – higher yields, significantly lower costs, and panel lifespans regularly exceeding twenty-five to thirty years. What once seemed experimental has become a mature solution. Therefore, the roof ceases to be a mere cost factor and becomes an asset. The electricity produced can be consumed on-site, reducing purchases from the grid, or fed back to generate additional income. And the most often underestimated aspect is the duration: once the investment is amortised, the panels continue to produce for many years. Each kilowatt-hour self-consumed is no longer purchased; each kilowatt-hour fed back becomes revenue. For the investor, the building is no longer just a leasable area in square metres: its roof directly contributes to the project's profitability.
A vision already integrated at PSI
At PSI, this reflection is not a projection: it is already integrated into projects being developed today. When technical, environmental, and economic coherence is achieved, the integration of photovoltaic solutions is systematically studied. The Églantier project is a concrete example of this: an installation of 222 panels of 450 Wp was carried out there, representing a total power of 99.9 kWp. A roof that was once passive thus becomes a genuine production tool. Beyond reducing CO₂ emissions, the equipment decreases users' energy dependence, enhances the building's asset value, and controls long-term operating costs. The panels then become more than just technical equipment; they are an economic asset integrated into the building.
Towards the energy-efficient buildings of the future
Tomorrow's buildings will be better insulated, produce some of their own energy, be able to store it, and actively participate in the transition – all while becoming tools for long-term value creation. This transformation is no longer the domain of a few pilot projects: it is establishing itself as a new way of designing corporate real estate. After two centuries spent consuming energy, industrial buildings are becoming producers and full participants in the energy system. A quiet revolution, which is currently being built on the rooftops of thousands of companies in Europe – and which PSI intends to help shape: higher-performing, more autonomous, more sustainable buildings that create value for their users and their investors alike.