The company is a leading provider of cash solutions in the UK and runs a fleet of around 2,000 vehicles throughout a network of 44 cash transportation branches and 10 cash and coin centres.

G4S says that because of the number of complex security systems run by its vehicles, each one requires a constant energy input when the couriers are making their cash deliveries and collections, necessitating a feed from the engine when stationary and using additional fuel in the process.

However, through working closely with a leading UK specialist manufacturer, a solar panel has been integrated into the design of its armoured vehicle that is said to be both cost effective and enables the vehicle’s engine to be switched off while ensuring the security systems are fully effective.

The photovoltaic module is incorporated into a panel on the roof of a cash delivery vehicle and will produce enough sustainable energy to power the vehicle’s ancillary electrical energy usage.

John Lennox, head of fleet management, G4S Cash Services (UK), said: 'These solar panels could reduce our carbon emission output by around 900 t/CO2 per year if we incorporate them across the whole of the UK Cash Services fleet.  We estimate that the costs saved on fuel would pay for our initial investment within the first ten months. Providing the three month trial is a success, we’ll introduce the panels to new vehicles in 2010, with a view to retro-fit the current fleet in a planned programme over the following year.'