Stored potential: making on-site solar work harder

26 November 2025

As organisations navigate an increasingly complex energy landscape, two technologies –solar PV and battery energy storage systems – are proving especially powerful. For energy managers, understanding and integrating these solutions isn’t just an advantage; it’s becoming essential for controlling costs, improving resilience and meeting sustainability targets, says Christofer Fisher, senior technical product manager at UK renewables distributor Segen Ltd.

The UK’s drive toward net zero is accelerating, and energy managers have a key role to play in supporting this transformation. As organisations face mounting pressure to cut emissions, manage rising energy costs and build resilience against grid instability, two technologies are proving particularly powerful when combined: solar photovoltaic (PV) systems and battery energy storage systems (BESS).

Together, these technologies offer energy managers a strategic pathway to greater energy independence, operational efficiency and long-term savings. At the same time, they provide the foundation to move toward full building electrification powered by clean, self-generated energy, supporting applications such as heat pumps, electric vehicle charging and more.

Solar PV: the first step to sustainable energy management

Solar PV remains one of the most accessible and effective ways to decarbonise an organisation’s energy supply. By generating clean electricity on-site, solar system owners can offset a sizeable portion of their grid consumption, protect against volatile retail electricity prices, and demonstrate visible progress toward sustainability targets.

The economics of solar PV are also increasingly compelling. Over the past decade, the cost of solar panels has fallen sharply, even as retail electricity prices continue to fluctuate. At the same time, rapid technological advances—particularly in solar inverters, the “brains” of PV systems that optimise energy production—have transformed what’s possible. Modern inverters can maximise energy output from rooftops once deemed too small, shaded or poorly oriented. The result? Sites once written off as unsuitable for solar are now viable, and the opportunities for clean energy generation have expanded dramatically.

For energy managers, this combination makes solar PV one of the most cost-effective tools for delivering measurable returns and carbon savings. However, because solar generation is limited to daylight hours, energy production doesn’t always align with building demand. Peak output may occur when occupancy—and therefore consumption—is lower, meaning that without a strategy to store or redistribute surplus electricity, a portion of that renewable potential can go untapped.

Storage: unlocking the full potential of solar

This is where battery energy storage systems come into play. Batteries bridge the gap between generation and demand by storing excess solar electricity produced during the day for use at other times.

For energy managers, storage introduces a new level of flexibility and control into what was once a rigid supply-and-demand relationship. Battery systems enable load shifting and peak shaving, allowing stored energy to be drawn on during periods of high demand or when electricity tariffs are at their peak. This allows system owners to significantly increase their solar self-consumption rate, which directly contributes to a shorter ROI period.

Additionally, when paired with a backup interface, batteries can deliver reliable backup power, keeping critical operations running smoothly during power outages or grid disturbances.
By integrating energy storage into their systems, organisations can also participate in demand-side response schemes, optimising when and how they use or export electricity—and, in some cases, even unlocking new revenue streams.

Solar-plus-storage: the foundation for full building electrification

By optimising solar energy production and storing excess energy for use when it is most advantageous, organisations can future-proof their energy use as they transition toward full building electrification.

For example, during daylight hours, solar-generated electricity can be used to directly drive heat pumps, providing low-cost heating or cooling. Heat pumps offer a highly efficient heating solution compared to traditional technologies because they move heat rather than generate it through combustion or resistive electric heating. When powered by solar, rather than energy from the grid, both the financial and environmental benefits of heat pumps are amplified, as the energy that is consumed is both clean and low cost.

While heat pumps can run directly on solar power without a battery, this limits operation to periods when the sun is actively generating enough energy. This means heat pumps cannot operate at night or on cloudy days without drawing additional power from the grid. Integrating a battery closes the loop, enabling heat pumps to operate efficiently for longer periods. This ensures solar energy is more fully utilised and further improves system ROI.

In short, the synergy between solar generation, storage and electrified heating creates a self-reinforcing system, one that helps energy managers balance loads, optimise efficiency and progress toward full electrification of their sites with total confidence.

Breaking down the cost barrier

While the business case for installing solar and storage systems has never been stronger, the upfront cost still presents a barrier for many organisations. In this environment, exploring available grants and subsidies is the smart first step towards making sustainability projects more viable and cost-effective.

Beyond public funding, the solar industry itself is innovating to lower financial barriers. Earlier this year, Segen partnered with BNP Paribas to launch Segen Finance. Through this initiative, Segen’s network of approved installers can now combine finance packages with their technical solutions, making it possible for their customers to move forward with clean energy projects that might otherwise have been delayed by budget constraints. The result is a more inclusive pathway to decarbonisation, one that enables both public and private sector energy managers to start realising the benefits of clean, self-generated power sooner.

A smarter energy future

Organisations now have an unprecedented opportunity to reshape how they produce, store and use energy. By combining solar generation, battery storage and emerging technologies like heat pumps, they can create integrated, future-proof energy systems that cut costs, reduce emissions and strengthen resilience against market volatility. Energy managers play a vital role in this transformation, guiding strategy and ensuring that these solutions deliver maximum impact.

The tools, expertise and financial pathways now exist to make this transformation achievable for almost any organisation. With the right partners, careful planning and a strategic approach, solar and storage are no longer just smart investments; they’re the foundation for long-term energy efficiency and sustained cost savings.

For more information, visit www.segen.co.uk/info