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Plug-in hybrids are the next big wave in automotive technology, as the slew of concepts being released in anticipation of the Frankfurt auto show attest. Yesterday, Volvo announced its ReCharge plug-in hybrid concept. Today, it’s Opel’s turn to join the ranks.

The Opel Flextreme shares some technology and a similar frame with the Chevy Volt, although the Euro version uses a diesel motor to charge the batteries. Range on battery power alone is expected to be in the neighborhood of 100km (62 miles). Combined range is an impressive 775km (480 miles). Once the lithium-ion batteries are sufficiently depleted, the diesel motor will kick in to top them up.

A completely unique feature of the Flextreme is the storage compartment designed to hold two Segway scooters. And don’t worry if your Segways need some more juice to make it from the lot to the shops: the Flextreme can charge them on the spot, directly from its electrical system.

An electric motor driving the front wheels generates up to 120kW and 320Nm, and is also capable of regenerative braking. The generator connected to the diesel engine provides 53kW of charging power. The fossil-fuel motor is a 1.3L turbodiesel with intercooler. When functioning solely to maintain the charge level, the motor can be adjusted to maintain between 1,500rpm and 1,800rpm. However, if the batteries are sufficiently depleted, and the entire power of the diesel is required, it can increase up to 3,200rpm.

The Flextreme’s futuristic looks blur the line between hatchback and micro-van. The extensive glasswork should provide excellent forward and side visibility, although the blocky C-pillars and a pillar down the center of the rear window may hinder rearward vision. Expect more details and photos to come next week.