No official pics of the production version have been revealed, but above is one of three prototypes about to be driven 16,000km from Solihull to Tata Motors HQ in Mumbai

No official pics of the production version have been revealed, but above is one of three prototypes about to be driven 16,000km from Solihull to Tata Motors HQ in Mumbai

Land Rover's first production diesel-electric models will have their international debuts at September's Frankfurt IAA. The Range Rover Hybrid and Range Rover Sport Hybrid are due in UK dealers from early 2014.

Both vehicles' powertrain consists of the existing Ford-sourced 3.0-litre SDV6 and one electric motor which produces 170Nm of torque. Peak power is 340PS at 4,000rpm and 700Nm of torque between 1,500-3,000rpm. The gearbox is a ZF-sourced eight-speed automatic.

In driver-selectable EV mode the vehicle can travel at speeds of up to 30mph (48km/h) for a range of up to one mile (1.6km) before the engine restarts. The CO2 average is 169g/km and the official Combined average is 44.1mpg (6.4l/100km).

The hybrid system, including lithium ion battery pack, inverter and electric motor weighs less than 120kg, Land Rover claims. The Range Rover Hybrid has a full size spare wheel and its five-seat format is unaffected by the addition of the hybrid components. The same applies to five-seat versions of the Range Rover Sport Hybrid, but as is the case with existing 5+2 versions of the RSS, the spare in the RRS Hybrid is not a full size one.

Vehicle weights are quoted as 2,372kg for the Range Rover Hybrid and 2,394kg for the RR Hybrid.

Both new models will go down the same line as the Range Rover and Sport at JLR's Solihull plant in the West Midlands. UK dealers will begin taking orders from 10 September.

Land Rover revealed a prototype Range Rover Sport plug-in diesel-electric hybrid at the Geneva motor show in March 2011. The vehicle, which was called 'Range_e', was claimed to be able to travel 20 miles on electric power alone, with its batteries charged either from the mains or via the vehicle's 3.0-litre V6 diesel engine. Whether or not a PHEV version of either of Land Rover's first production model hybrids will be launched is not yet known.

The first UK market deliveries of the new vehicles will be in early 2014. It is not clear whether either will be sold in North America or China, two markets where only petrol engines are available for the Range Rover and new Sport.

Author: Glenn Brooks