BMW is evaluating the integration of range extender technology into future electric models, with internal discussions ongoing about launching extended-range electric vehicles (EREVs), according to German publication Automobilwoche. The company is reportedly testing a prototype known as the iX5 REx and may bring it to market as early as 2026.
EREVs are vehicles powered exclusively by electric motors, but equipped with small combustion engines that generate electricity when the battery is depleted—unlike plug-in hybrids, which can directly drive the wheels using either engine. The format has proven especially popular in China, a market where BMW sees strong potential for EREVs, though North America and Europe are also being considered.
According to Autocar, BMW has partnered with German automotive supplier ZF to develop the range extender system. The system is being tested in the iX5 prototype, with a potential electric driving range of up to 1,000 kilometers. ZF has developed two versions of the drive unit—eRE and eRE+—offering between 70 and 150 kW of output.
“The new interest and increased demand for range extenders shows that the potential of this technology is far from exhausted,” said Otmar Scharrer, Head of Development for Electric Drive Technology at ZF. He noted that the platform approach allows for faster development cycles tailored to market needs.
BMW is not new to the concept. Its first application of range extender technology was in the i3, which debuted in 2013 and included an optional generator-powered variant until it was phased out in 2018.
BMW’s move follows a broader industry trend. Volkswagen recently previewed plans for EREV models through its Chinese joint ventures, including the SAIC-Volkswagen ID. ERA SUV, slated for a 2025 release. Xpeng, a former proponent of fully battery-electric models, also announced its entry into the EREV segment in late 2024.