Stellantis is testing synthetic e-fuels, which are made with renewable energy, on 28 types of its internal combustion engines, a step it said could help decarbonize its existing European fleet.

The announcement comes just weeks after the European Union opened a legal route in its phase-out of carbon dioxide-emitting cars from 2035 which would allow those models with combustion engines running on e-fuels to remain on sale.

The exemption, championed by Germany, was hailed by some as preserving technological freedom but viewed by others, flagging e-fuel’s low availability and high cost, as a dangerous loophole for potentially polluting combustion engines.

Solutions being tested could apply to up to 28 million Stellantis vehicles, with a potential reduction of CO2 emissions in Europe of 400 million tons from 2025 to 2050, the automaker said.

Read the full article here.