26
feature
sustainability & energy saving solutions
the untapped asset on every commercial roof
Dr Phil Wu at Absolar looks at why solar has the potential to make a huge difference to commercial buildings ...
One of the most overlooked assets on any commercial balance sheet is sitting in plain view: the roof. Across the UK, millions of square metres of industrial, retail and office rooftop space remain unused, even as energy costs and carbon targets climb the boardroom agenda. Solar has quietly become one of the most reliable ways to convert that dead space into a revenue-generating asset, yet a surprising number of businesses still treat rooftop solar as a nice-to-have rather than a core part of their energy strategy. Why the hesitation? In our experience
working with commercial property owners across sectors, from logistics warehouses to research laboratories to independent farms, the barrier is rarely appetite. It is data. Decision makers are asked to commit capital to a 20 to 25 year asset based on incomplete information about
their roof’s structural capacity, their site’s actual energy consumption profile, and the true payback period once degradation, maintenance and export tariffs are factored in. Without that data, solar gets parked as something to revisit next year, and next year’s energy bill arrives regardless. This is where the picture is changing.
Remote assessment tools, satellite and LiDAR-based surveys, and better monitoring data mean businesses no longer need to commission an expensive site visit just to find out whether solar is viable. A building’s solar potential, structural feasibility and indicative payback period can now be modelled remotely, often within a day, giving finance teams the numbers they need before committing to a full engineering survey. Grant schemes and asset finance options have also
matured alongside the technology, further shortening the gap between a promising survey and a signed-off budget. And the numbers, when they are good,
tend to be very good. A 520kW installation across two industrial warehouses can save well over 100 tonnes of CO₂ a year while cutting a meaningful chunk off the site’s electricity bill, savings that compound as grid prices remain volatile. Smaller sites see the same pattern at a different scale: a 50 to 60kW system on an office building can save 8 to 12 tonnes of CO₂ annually and pay for itself well within six years; and the performance data now makes that payback period far more predictable than it once was. One retailer measured a saving of £1,700 in electricity costs at a single branch in its first month with panels installed, a figure concrete enough to justify a second and third site.
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