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S650 Ford Mustang Hybrid Currently In Development: Exclusive

At this point, we’ve been waiting on the arrival of a Ford Mustang hybrid for quite a long time now, and in fact, The Blue Oval even officially announced that such a thing was in the works way back in 2017. At that time, FoMoCo stated that it would be investing $700 million in the Flat Rock Assembly plant in Michigan, where the pony car is built, in part to support production of a Ford Mustang hybrid V8 model slated to debut in 2020.

That never happened, but now, sources familiar with the matter have told Ford Authority that The Blue Oval currently has an S650 Ford Mustang hybrid model in operation – known internally as S650E. It’s unclear what sort of hybrid powertrain is present in this pony car – it could be a traditional hybrid or plug-in hybrid, however. It’s also unclear if this project will ever see the light of day, given the fact that the Trump administration has worked to relax fuel economy and emissions regulations for vehicles as of late, in general. That said, S650E prototypes are running around and have entered the Technology Prove-Out stage, meaning there’s mules being tested that likely feature some form of electronification.

The new Ford Mustang GT Performance in Argentina.

Regardless, The Blue Oval previously announced that it planned to add some sort of hybrid powertrain option to every model in the ICE-focused Ford Blue lineup by 2030, and the Mustang just so happens to fall under that umbrella, making such a thing seem likely to happen. There are also a couple of other indicators that a Ford Mustang hybrid will eventually become a reality, based on comments from Ford CEO Jim Farley over the course of the past few months.

Back in August 2023, Farley poured cold water on a potential all-electric version of the iconic pony car, saying that the automaker would “probably not” go that particular route. However, at the same time, the exec also said that a “partially electrified Mustang coupe” was a strong possibility, too. Then, in August 2024, Farley revealed that Ford Performance (now known as Ford Racing) was working on testing hybrid powertrains, saying “we really do believe partial electric powertrains work well for performance drivers.”

Brett's lost track of all the Fords he's owned over the years and how much he's spent modifying them, but his current money pits include an S550 Mustang and 13th gen F-150.

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