Regenerative braking explained for learner drivers

Regenerative braking is a feature of electric cars that slows the car when you release the accelerator, while recovering some of the energy that would otherwise be wasted. For a learner, the biggest difference is that you may use the brake pedal less often, but you need to be more aware of when, and how quickly, the car slows down.

I teach automatic lessons in Rene, my electric Renault 5 E-Tech, and one of the things I like most about it is that I can adjust the strength of the regenerative braking, so learners feel the difference for themselves. Here's how it works, what it feels like and how to use it safely.

What is regenerative braking?

In a petrol or diesel car, you slow down by lifting off the accelerator and, when you need to, pressing the brake. The brakes work by friction, turning the car's movement into heat, and that energy is wasted.

An electric car can do something cleverer. When you lift off the accelerator, the electric motor works as a generator. Instead of using electricity to drive the wheels, it uses the car's movement to make electricity, which goes back into the battery. That process creates resistance, which slows the car.

It doesn't recover all the energy, and it won't mean the car never needs charging. But it does make the car more efficient, particularly in stop-start traffic.

What does it feel like?

Imagine driving at 30mph and lifting your foot off the accelerator. In a petrol car, you'd gradually lose speed and keep rolling for some distance. In an electric car with strong regenerative braking, you feel the car slow straight away, almost as if someone had gently pressed the brake for you.

How strong that feels depends on the car and its settings. With mild regenerative braking, it feels much like a petrol automatic. With strong regenerative braking, lifting off completely slows you quite noticeably.

It can feel a little odd the first time, but most people adapt quickly. What matters is learning to control how quickly you slow down, rather than lifting off and letting the car decide.

Can you adjust it?

In many electric cars, yes, though how much varies. Rene has paddles behind the steering wheel to change the strength. At the lowest setting, the car rolls on fairly freely when I lift off. At higher settings, it slows much more noticeably, and the strongest setting gives you one-pedal driving (more on that below).

That's very useful when teaching, because you can feel the difference rather than just hear about it. It also shows something important: not every electric car behaves the same way. If you learn in one and later buy another, it may feel quite different.

How I teach regenerative braking

My priority isn't to turn you into an expert on electric cars. It's to make you a safe, confident, independent driver.

That's why I start learners with strong regenerative braking. It shows you exactly what your right foot is doing: press and the car goes, ease off and it slows. Once that's second nature, we move to a more conventional mode, closer to how a petrol automatic behaves, and you use the brake pedal more. That way, your skills transfer to whatever you drive next.

Along the way, we work on easing off the accelerator progressively. Rather than lifting your foot off in one go, you ease off gradually, so you control how quickly you slow down. It makes all the difference when you're following another car, approaching a junction or slowing for a bend. Done well, your passengers should barely notice you're slowing down.

Using it on Sevenoaks roads

Sevenoaks is a great place to see what regenerative braking can do.

• Steep hills, like Hubbards Hill and River Hill. Going down, regenerative braking does a lot of the work of holding your speed steady, and recovers plenty of energy while it does. But keep a close eye on your speed and be ready to use the brake, because on a steep hill the car can still gather speed. And if the battery is fully charged, there's less room to store energy, so the car may not slow as much as you expect.
• London Road, with its busy pedestrian crossings. You're driving slowly anyway, so one-pedal driving makes it easy to ease your speed smoothly without moving your foot between pedals. But if someone is waiting at a crossing, cover the brake and be ready to stop.

Practising on roads like these, with me beside you, is the best way to get a feel for it before you drive them on your own.

Junctions, roundabouts and crossings

Approaching a junction safely still means observation, anticipation and the right speed. Regenerative braking doesn't change that. It changes how you reach that speed.

If you spot the junction early, regenerative braking can do most of the slowing, with just a touch of the brake at the end. But timing matters:

• Lift off too early, and you'll slow down too soon, crawling while you're still some distance away.
• Lift off too late, or rely on it too much, and you'll arrive too fast.

Roundabouts work the same way. You can often adjust your speed just by easing off, then accelerate smoothly if it's clear. But slowing down isn't the same as being ready to stop. If you might need to give way, be ready on the brake. The same goes for pedestrian crossings, traffic lights and junctions where you can't see well.

What is one-pedal driving?

One-pedal driving is a stronger form of regenerative braking. You control most of your speed with the accelerator alone: press to go, ease off to slow, and in some cars, lift off completely and the car comes to a stop. In Rene, lifting off slows you right down but doesn't bring the car to a complete stop, so you still use the brake pedal to stop.

It's handy in slow traffic, because you're not constantly moving your foot between pedals. But the name is a little misleading. One-pedal driving doesn't mean you stop using the brake pedal. If a pedestrian suddenly steps out, brake immediately and firmly. Don't wait for the car to slow itself. Renault's own handbook says the Renault 5's one-pedal function isn't suitable for an emergency stop.

Why it doesn't always feel the same

Regenerative braking isn't always the same strength:

• A full battery has less room to store energy, so the car may slow less.
• A very cold battery can also limit it.

So the car may not slow as strongly as you expect. Never come to depend on one particular level of regenerative braking. You must always be able to control the car with the brake pedal.

Do the brake lights come on?

In many electric cars, strong regenerative braking does turn the brake lights on, even though you haven't touched the brake pedal. Light regenerative braking may not. So never assume that lifting off will warn the driver behind. Check your mirrors, plan ahead and avoid slowing more sharply than you need to.

Does regenerative braking affect your driving test?

No. Regenerative braking is perfectly acceptable on your test. You don't have to switch it off, and you won't lose marks just because your car uses it.

The examiner is looking at whether you drive safely and control the car well: sensible speeds, good junction approaches, effective observations and safe responses to hazards. Using regenerative braking badly could contribute to a fault, for example lifting off sharply and slowing harshly, or arriving at a junction too fast because you left it to the car. The technology isn't the issue. It's how you use it.

My advice

Regenerative braking is one of the things that makes electric cars interesting to drive. It's efficient, it saves wear on the brakes and it makes everyday driving feel smoother. But I wouldn't focus on recovering energy. That comes second.

The skills that matter most are still observation, anticipation, planning and smooth control. If you spot a junction early, read what's happening and adjust your speed gently, you're already driving well. Regenerative braking just gives you another way to do it.

The best drivers anticipate what's coming next. Regenerative braking rewards exactly that.

The settings described are for my Renault 5 E-Tech. Other electric cars work differently, so check your car's handbook.