The new Range Rover Hybrid and Range Rover Sport Hybrid, the first hybrid models in Land Rover’s history, will go on sale next month with first deliveries in early 2014.

Power is supplied by a combination of the familiar 3.0-litre V6 diesel engine assisted by a 35kW electric motor to produce a total output of 340PS and 700Nm of torque.

Performance is a touch more brisk than the existing diesel models, with the Range Rover Hybrid achieving 0-62mph in 6.9 seconds (down from 7.4 secs), and the Range Rover Sport Hybrid completing the same sprint in 6.7 seconds (down from 6.8 secs).

Top speeds are slightly higher at 135mph and 140mph for the Range Rover and Sport models respectively.

Of course, the big news is the effect on the fuel economy and emissions figures, with both Hybrid models achieving 44.1mpg on the combined cycle while emitting just 169g/km of CO2 – an improvement on the purely diesel Range Rover’s 37.7mpg and 196g/km.

The powertrain, which is identical on both models, drives the wheels through an eight-speed ZF automatic transmission.  The combination of electric motor, inverter and battery pack adds just under 120kg to the overall weight of the vehicle.

The 35kW electric motor can deliver 170Nm of torque to boost acceleration, or drive the vehicle in a pure EV mode.  The motor also acts as a generator, charging the battery during braking.

In pure EV Mode, the Range Rover Hybrid can travel at speeds of up to 30mph for about one mile before the diesel engine kicks in to top up the batteries.

Land Rover say the new Range Rover models were designed with a hybrid powertrain in mind, and this has allowed them to integrate the liquid-cooled lithium-ion battery pack into the floor of the vehicle without impacting on cabin or luggage space.  In addition, the vehicle’s wading depth rating and ground clearance remain unaffected, and even the full-size spare wheel is retained.

Order books for the Range Rover Hybrid and Range Rover Sport Hybrid open on 10th September, with first deliveries expect in early 2014.

Prices are still to be confirmed.