In engineering, you’re cautioned against making sweeping generalizations and you try not to engage in hyperbole. Having said that, it would be silly not to show enthusiasm about the recent efforts shown by automakers moving to extended-range electric vehicles (EREVs) as an answer to sway buyers having range anxiety.
EREV technology uses a small, efficient internal combustion engine (ICE) only to generate electricity for the battery, not to drive the wheels directly. EREVs allow for smaller, lighter batteries while still offering high-range capability, solving concerns regarding long-distance travel and charging infrastructure.
An EREV system essentially consists of an additional electric motor that acts as a generator, an inverter for voltage conversion, and a small combustion engine that powers the generator, which in turn charges the high-voltage battery when needed. The gasoline engine acts as an on-board generator employed to charge the moderately sized battery to handle heavy loads and long distances.
In short, EREVs promise all of the benefits of regular EVs, but without range anxiety or charging concerns.
Range extenders make sense because a pure EV would require a much larger battery to deliver a comparable driving range, increasing weight. Intended largely to meet the needs of the Chinese electric car market, EREVs also have the potential to enhance the electric mobility markets in Europe and North America. As many as 15 EREVs are expected in the U.S. by 2028.
1400-km Range Extension by 2030
The Renault Rafale PHEV, launched in 2024, is a midsize crossover that will be built on the RGEV medium 2.0 platform. It offers a range-extender option to reduce range anxiety and convince more buyers to switch from pure combustion-engine vehicles. The RGEV medium 2.0 platform brings 800-V fast charging, up to 750-km range with the generator providing roughly 600 km of additional driving, a 4x4 EV option with 2-ton towing, and a range-extender variant capable of 1,400 km.
Renault has laid out its futuREady strategy, with 26 new products coming by 2030, including 1,400-km range-extender capability. The brand is aiming to sell more than two million vehicles worldwide by 2030, with half of those sales generated outside Europe.
Through its Horse Powertrain Limited 50-50 joint venture with China’s Geely, aimed at developing next-generation hybrid and ICE technologies, the company is creating compact, suitcase-sized ICEs that act solely as generators to power the battery.
The Horse C15 System, revealed at IAA Mobility 2025, is a compact 1.5-liter generator that can be fitted in the "frunk" (front trunk) or under the hood to act as a range-extender EV boosting range to around 500 miles.
The new range-extender platforms and vehicles are scheduled for introduction by 2028-2030, as part of a 36-model launch aimed at hitting 100% electrified sales in Europe by 2030.
VW’s EREV SUV
Volkswagon’s ID. Era 9X is a spacious full-size SUV with three rows of seats. Derived from the concept vehicle unveiled at the 2025 Shanghai auto show, it’s intended for China and is its first model featuring range extender technology.
Developed together with China’s SAIC via the local VW-SAIC joint venture, it uses a 1.5L gasoline engine as a generator for the battery, delivering about 300-km EV range and more than 700 km of additional range.
The four-cylinder unit belongs to the EA211 family. It runs on the Miller cycle, an ICE thermodynamic cycle patented by Ralph Miller in 1957 that reduces fuel consumption by roughly 15% compared to conventional engines. It works by leaving the intake valve open during part of the compression stroke, allowing air to push back into the intake, which results in a higher expansion ratio than compression ratio. The extended-range engine/generator also features variable-geometry turbocharger technology.
The combustion engine produces 141 hp and works in tandem with either one or two electric motors. The base model uses a single rear-mounted motor delivering 295 hp. The dual-motor, all-wheel-drive version raises total output to 510 hp. The single-motor model comes with a 51.1-kWh battery; a larger 65.2-kWh battery pack is also available and will be standard on the dual-motor configuration.
The EREV employs either a 65.2- or 51.1-kwh lithium-iron-phosphate (LFP) battery, delivering a pure electric range of 300–350 km. It features a 15.6-in. central control screen, a 21.4-in. rear roof-mounted screen, and a 12.8-meter ambient lighting system, with LiDAR for advanced driver assistance.
