Six different Evoque development cars spotted testing have been registered as using a 2.0-litre diesel-hybrid engine, according to an online database.
The plans tally with Jaguar Land Rover's announcement last year that it wanted to electrify all of its models by 2020.
We know the Evoque is set to launch with 1.5-litre plug-in hybrid, but previous research projects by Jaguar Land Rover suggest the 2.0-litre diesel powertrain is likely to use a 48V mild-hybrid set-up.
We expect it to echo a JLR prototype called Concept_e MHEV. This mild hybrid is based on a Range Rover Evoque donor vehicle and features a prototype 89bhp diesel engine with a 48V electrical system.
It incorporates a 15kW crank-integrated motor with a disconnect clutch within a hybrid module sandwiched between the engine and a nine-speed transmission. The motor-generator is powered by an advanced 48V electrical system and a 48V lithium ion battery.
The brand’s decision to use diesel power in its hybrid Evoque contrasts a move it made with the larger Range Rover hybrid, which swapped from diesel-electric to petrol-electric power in its latest update.
Diesel has come under pressure in recent months, with the UK Government announcing raised taxes for diesel models in a bid to lower the number of them on the road. But diesel cars, particularly those assisted with electric power, are still considered among the most efficient for long distance drivers.
The mild hybrid Evoque will likely offer the very best economy figures and lowest CO2 output in its range. It will lend its electrified diesel powertrain to sibling models in the Discovery Sport and Jaguar E-Pace ranges.
Jaguar Land Rover’s wide-ranging adoption of electric power comes as part of a heavy push towards electrification. JLR CEO Ralf Speth confirmed last year that its electrified model range would "embrace fully electric, plug-in hybrid and mild hybrid vehicles".