Solar Ireland: The truly electrified building

PRISCILA MC GEEHAN, Director of Communications & Strategy, Solar Ireland, outlines why solar-ready design is becoming central to Ireland’s energy future.

Electricity demand is expected to rise significantly as heating, transport and industry continue to electrify. Heat pumps, EV charging, battery storage and smart energy systems are already becoming more common across residential and commercial developments, while Ireland is working towards much higher levels of renewable electricity generation and lower operational emissions across the built environment.

This shift means buildings will increasingly need to generate, manage and store energy as well as consume it.

For the construction and building services sector, that changes the conversation around solar energy. Rooftop solar is no longer simply an environmental upgrade or optional sustainability measure. It is becoming part of building performance, energy resilience and long-term operational efficiency.

The question is no longer whether buildings should be designed with solar in mind. The question is whether Ireland can afford to continue designing buildings that are not.

Designing for the energy system ahead

Traditionally, buildings were designed around predictable electricity consumption patterns and relatively centralised energy generation. That model is changing quickly.

Future buildings will interact far more dynamically with the electricity system. They will increasingly combine rooftop solar, electrified heating, battery storage, EV charging infrastructure and smart controls to manage energy demand and reduce operating costs. This has important implications for architects, engineers, developers and contractors.

Solar readiness is no longer simply about roof space. It affects structural loading, electrical design, plant space, cable routes, inverter locations and how building systems integrate over the lifetime of the asset.

The earlier these considerations are addressed, the easier and more cost-effective deployment becomes. Retrofitting buildings for solar and electrification after construction is often significantly more expensive than integrating these elements from the outset.

Good design decisions made today can help avoid future retrofit costs while improving energy flexibility and resilience.

Solar-installed, not just solar-ready

There is another important dimension to this discussion – affordability.

As energy costs continue to affect households and businesses, buildings that can generate part of their own electricity will become increasingly valuable, particularly homes, SMEs and public buildings with predictable daytime demand.

For many years, the conversation focused on making buildings “solar-ready”. That was an important first step. But as Ireland moves deeper into electrification, there is a growing case for asking a more fundamental question: should new buildings still be delivered without solar already installed?

Retrofitting solar after construction is almost always more expensive and more disruptive than integrating it during the build phase. Roof access, scaffolding, electrical works and system integration can all be delivered more efficiently when solar is treated as part of the original building design rather than as a future upgrade.

This is especially important in the context of housing delivery. Ireland cannot afford to build a new generation of homes that may require costly energy upgrades within a relatively short timeframe. Integrating rooftop solar from the outset can help reduce future retrofit costs while improving long-term affordability for occupants.

The same principle applies to commercial and public buildings. Solar should increasingly be viewed as part of core building infrastructure, alongside heating, lighting and ventilation systems, rather than as an optional sustainability feature.

When combined with battery storage, heat pumps and smart energy management systems, on-site solar can help create buildings that are better prepared for a more electrified energy system.

Commercial and industrial opportunity

Ireland also has a major opportunity across commercial and industrial buildings.

Warehouses, logistics facilities, factories, retail centres and agricultural buildings often have extensive roof space and significant daytime electricity demand, making them particularly suitable for rooftop solar generation.

For businesses, this can reduce exposure to energy price volatility while supporting sustainability and carbon reduction goals. For the electricity system, distributed generation reduces network pressure by producing electricity closer to where it is consumed.

Unlocking this potential at scale will require coordination across policy, planning, grid infrastructure and building design. It will also require delivery capacity, with engineers, electricians, installers and construction professionals playing a central role in Ireland’s next phase of solar deployment.

The role of building services professionals

Building services engineers are increasingly operating at the intersection of construction, energy and digital systems.

The electrified building will rely on multiple technologies working together efficiently. Solar panels, heat pumps, EV charging infrastructure, battery systems and energy management platforms cannot be treated as isolated components. They must function as part of a coordinated building energy strategy.

This creates a significant opportunity for the sector. The expertise required to design and manage these integrated systems will become increasingly important as Ireland’s building stock evolves.