A lively discussion has emerged across the UK concerning the most effective and sustainable locations for solar panel installations. The debate, sparked by a reader’s query from Middlesbrough, highlights a popular internet meme suggesting car parks as an alternative to green spaces for solar farms.
While the idea of covering car parks with solar panels has gained traction, experts and public contributors emphasise that the choice isn't necessarily an either/or scenario. Many argue that a comprehensive approach, incorporating both large-scale ground-mounted solar farms and smaller, distributed installations on existing infrastructure, is the most beneficial strategy for national energy needs. Large installations are crucial for the National Energy System Operator (NESO) to manage the national grid's balance and frequency, allowing for efficient switching of generation sources throughout the day.
Conversely, installing solar panels on car parks, warehouses, and other structures offers significant advantages for local electricity generation. This distributed model helps alleviate strain on the national grid and can be particularly effective when paired with battery storage, which has seen a dramatic price reduction in recent years. Some contributors point out that solar panels are now more cost-effective per square metre than traditional roof tiles, removing a key barrier to widespread deployment on buildings.
However, the cost factor remains a critical consideration. Ground-mounted solar farms are generally the most affordable source of new electricity because they require less steel and are less susceptible to wind load compared to elevated structures. While covering car parks is technically feasible, the additional construction costs make it less attractive for companies to undertake voluntarily. Several contributors suggested that legislative measures, similar to those introduced in France requiring solar on car parks, might be necessary to drive wider adoption.
Indeed, some legislative changes are already on the horizon. From 2028, new homes built in England will be required to have 40% of their ground-floor area equivalent roof space covered by solar panels. Beyond car parks and roofs, other innovative suggestions for solar deployment include floating panels on reservoirs to reduce evaporation and generate power, and integrating wind turbines along motorways, where the landscape is already altered by infrastructure.