Solar experts debate benefits and hurdles of car park energy projects

The movement to install solar canopies over existing parking infrastructure is gathering momentum as businesses, developers, and policymakers seek to expand renewable energy production without relying exclusively on greenfield sites. While solar farms on open land remain a common method for utility-scale generation, utilizing underused car park space has moved to the forefront of the national conversation regarding land use and energy independence.

Proponents describe solar canopies as a beneficial strategy. By covering asphalt — which often serves as a heat-absorbing surface — these structures generate electricity near high-demand urban centers, such as shopping malls, hospitals, and office complexes. Beyond power generation, the canopies provide shade that protects vehicles from weather, potentially extending their lifespan, and can integrate directly with electric vehicle charging infrastructure to support the rising demand for transport electrification.

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The cost of progress

Despite the functional appeal, the deployment of solar car parks faces distinct economic and logistical challenges compared to traditional ground-mounted solar. Constructing a canopy requires substantial steel structural support and concrete foundations. Developers and landowners often contend with complex zoning regulations and building codes that vary by region. Financial hurdles also persist; while large organizations such as the Bentley car factory in Crewe have implemented projects with significant capacity, smaller businesses may find the upfront investment difficult to justify. Many are now turning to power purchase agreements to manage these costs, allowing third-party entities to fund installations in exchange for long-term energy savings.

However, advocates argue that these projects provide a greater-than-four-percent return on a guaranteed infrastructure investment that can last for 25 years minimum.

Grid and policy limitations

National Energy System Operator (NESO) guidelines require the balancing of generation sources across the country, and stakeholders note that it is easier to manage a few large installations than a thousand small ones scattered across urban areas. Policy approaches to these hurdles differ globally. In France, legislation mandates solar installations on car parks over a certain size. In contrast, the United Kingdom currently lacks a national mandate, though government consultations have indicated a growing appetite for planning reforms that could eventually require solar panels on new car park developments. This approach is supported by organizations like Cpre, who suggest that the built environment could deliver a significant portion of the country's necessary solar capacity.

Alternative sites and future outlook

As the debate continues, experts emphasize that there is no singular solution to the nation's energy needs. Research into "floatovoltaics", solar panels on reservoirs, continues to be monitored as a way to maximize land use while potentially reducing water evaporation. Other proposed sites include land alongside railways and motorways.

The false dichotomy between greenfield solar and car park solar is frequently challenged by those who argue that a diverse approach, utilizing rooftops, water bodies, and brownfield sites, is necessary to reach long-term climate targets. While car parks may not replace the need for larger, centralized energy installations, they are increasingly viewed as a vital component of the energy mix, transforming previously dormant urban spaces into active nodes of the green economy.

What to watch next

• Planning Reforms: Ongoing government consultations regarding potential mandates for solar requirements in new car park developments.
• Market Growth: Anticipated increases in demand for solar canopy installation services across public and private sectors, including hotels, leisure centers, and transit hubs.