Regenerative Braking

How it works

When you lift off the accelerator in an EV, the electric motor switches roles and becomes a generator. The car’s forward momentum turns the motor shaft, which generates electricity. That electricity flows back to the battery. The resistance created by this generation is what slows the car down.

In a petrol car, braking converts kinetic energy to heat through friction - energy that’s just lost. Regenerative braking captures a portion of that energy instead. You don’t get it all back; some is still lost to heat and drivetrain friction. But recovering 15–25% of the energy used in a typical urban cycle is meaningful.

The regen dial

Most modern EVs let you adjust regenerative braking intensity. The lightest setting (“coasting”) feels like a petrol car - when you lift off, the car rolls freely. The strongest setting creates significant deceleration the moment you release the accelerator - experienced drivers use this to drive largely one-pedal, braking with the accelerator pedal and only using the brake pedal for hard stops.

Which setting to use is personal preference, though stronger regen is generally more efficient in stop-start traffic. On a long downhill, moderate regen may be better - you want to slow the car progressively rather than saturating the battery.

One-pedal driving

One-pedal driving is the technique of using the regenerative braking alone (without the friction brakes) to control speed and come to a complete stop. Some EVs implement this natively at maximum regen - the Hyundai IONIQ 5 and 6 can come to a complete stop from highway speeds on regen alone. Others slow to a crawl and then engage the friction brakes for the final metres.

It takes about a week to retrain the muscle memory from petrol driving, but most EV owners quickly find one-pedal driving more intuitive in traffic.

The brake pad benefit

Friction brake pads in EVs last dramatically longer than in petrol vehicles. Some EV owners report brake pads lasting well over 100,000 km - some never needing replacement in the first seven years of ownership. The flip side: in some vehicles, if the brakes are used so infrequently that the discs don’t get properly worked, surface rust can develop on the rotors. It burns off quickly once the brakes are applied, but it’s worth giving the brakes a proper application every few weeks.

City vs highway range

Regenerative braking is why EVs often do better in city driving than on the highway, reversing the fuel economy pattern of petrol cars. Stop-start traffic gives constant opportunities to recover energy. A freeway cruise at constant speed has almost no regen events. This is why an EV’s real-world urban range can match or exceed its WLTP combined figure, while the highway figure is typically 15–20% worse.