How Tesla's Regenerative Braking Works

By Kevin Armstrong
Tesla offers three stopping modes
Tesla offers three stopping modes
Not a Tesla App

Braking is essential to the driving experience, but not all systems are created equal. A regenerative braking system (RBS) is the most significant difference people notice the first time they operate an electric vehicle.

Regen, as commonly referred to, makes it possible to drive a Tesla and never touch the brake pedal (along with some brake blending for slow speeds), not only reducing wear and tear on braking components but putting energy back into the battery. There are some estimates that regenerative braking can add 10 percent more range and extend the life of braking mechanisms by more than 50 percent.

What is Tesla's Regenerative Braking?

Unlike traditional brakes, which rely on friction to stop the wheels from turning, regenerative braking uses the vehicle's electric motor to create resistance to slow down the vehicle. In addition to slowing the vehicle down without the use of brakes, the motor running in reverse acts as a generator and captures the kinetic energy that would typically be lost as heat and converts it into electrical energy, thereby increasing your vehicle's range.

How to Activate Regen in a Tesla

In a Tesla, the regenerative braking system is activated by lifting your foot off the accelerator. The more you ease off the accelerator, the stronger the braking force and the more energy is captured.

Tesla's Power Meter (Regen bar)

Tesla's power meter, also known as the regen bar or line
Tesla's power meter, also known as the regen bar or line
Not a Tesla App

All Teslas feature a power meter either in the instrument cluster (Model S and X) or the center screen (Model 3 and Y) that displays the amount of energy being captured through regenerative braking, or the amount of energy being used by accelerating the vehicle.

The center of the line is considered neutral. Anything to the left of the center point means energy is being captured, while anything to the right means that energy is being used.

The further the line grows to the left, the greater the amount of regenerative braking is taking place, and the more it moves to the right, the greater the amount of power is being used.

The regenerative braking line is green, while the power line is black (or white when in dark mode). You may occasionally also see a gray line on the left side. This will appear if the vehicle has the 'Apply Brakes When Regenerative Braking Is Limited' feature turned on. This feature introduces a consistent braking experience when lifting your foot off the accelerator pedal when regenerative braking is limited.

You may also see the gray line appear on the left side of the power meter if the vehicle is in Autopilot. This helps the driver understand when the vehicle is using regenerative braking or physical brakes to slow down.

How Does Regenerative Braking Work?

Without getting too deep into Physics, kinetic energy is energy in motion. Therefore, anytime a car slows down, the kinetic energy that is produced has to go somewhere. With traditional brakes, that is heat from abrasion generated from the brake pads squeezing the rotors. But this energy can be used in a different way. In the words of a Tesla engineer, "kinetic energy stored in a moving vehicle is related to the mass and speed of the vehicle by the equation E = ½mv²."

You can see this equation play out every time you drive your Tesla by looking at the vehicle's power meter.

The motor controller manages the torque of the motor. This action helps with both driving and regenerative braking. The position of the accelerator pedal tells the motor controller how much torque is needed. The motor controller then changes this into a voltage or current that produces the correct torque. The rotating force can be positive or negative. When it is negative, it means the vehicle is slowing down, and energy is returned to the battery.

Regenerative Braking Explained

Regenerative Braking Extends the Life of Your Brakes

One of the benefits of regenerative braking is that it can help to lengthen the life of your brakes. Regenerative braking slows the car reducing the work of your traditional braking system. In fact, Tesla estimates that their cars experience 50 percent less brake wear than conventional gasoline cars. Elon Musk predicted that Tesla's Semi would have brake pads that would "literally last forever" because the regenerative system would save those pieces from being used extensively.

It's estimated that regenerative braking captures up to 70 percent of the kinetic energy usually lost during braking and is put back into the battery. As described above, that energy can then extend the range between needing to charge.

Does Regenerative Braking Activate Your Brake Lights?

During regenerative braking, Tesla will still activate the brake lights when the vehicle is slowing down, even if the brakes aren't being used at all. Tesla determines whether to turn on your brake lights based on your vehicle's rate of deceleration. If you're unsure if your brake lights are on, look at your Tesla screen, the car in the display shows the brake lights lit up when the brake lights are activated.

Levels of Regenerative Braking

It's important to note that regenerative braking cannot be turned off. There are two regenerative braking modes for 2020 and older models — low and standard. Tesla recommends that you use standard to maximize your vehicle's range. At some point in 2020, that choice was taken away, presumably to use all the benefits of regenerative braking all the time. However, there were some concerns, as regenerative braking can slow down the car rapidly; therefore limiting traction, the vehicle could slide. Tesla has this warning on its website: In snowy or icy conditions, Model S may experience loss of traction during regenerative braking.

Tire Configuration

The company also notes that installing winter tires may temporarily reduce regen. But the vehicle's systems are constantly recalibrating, so the feel of the vehicle will return to what the driver is used to after a few miles or trips.

You can speed up the calibration process by selecting the type of tires your vehicle is using. To select the type of tires your vehicle is using navigate to Controls > Service > Wheel & Tire Configuration > Tires and choose the appropriate tire type.

Regenerative Braking Limited or Reduced

Regenerative braking is not available or can be limited during certain conditions. If this happens, you may see a dotted line in the vehicle's power meter. If the battery is fully charged, there is nowhere for the kinetic energy to go. Consequently, regen won't work. It also has limited usage during cold weather due to a cold battery. In these cases, you can choose to activate 'Apply Brakes When Regenerative Braking Is Limited' to provide a consistent slow down experience. Tesla stated, "Your car can now automatically apply regular brakes for consistent deceleration when regenerative braking is limited due to battery temperature or state of charge." But the company did leave this as a preference, and the option can be turned off. You can activate it under Controls > Pedals & Steering.

Stopping Modes

Regenerative braking works best at certain speeds, if you're traveling too slow, regenerative braking may be limited or not available at all.

In a Tesla, your vehicle will use regenerative braking whenever you lift your foot off the accelerator pedal. However, if you're using Tesla's 'Hold' stopping mode, which allows you to drive with a single pedal most of the time, the vehicle will automatically blend in the vehicle's brakes when traveling 4 MPH (6.5 KPH) or slower.

If you're using Tesla's 'Creep' or 'Roll' stopping modes, the vehicle will never apply the brakes when lifting your foot off the accelerate, which means the vehicle will continue to roll at slow speeds when regenerative braking is no longer effect.

A Brief History of Regenerative Braking

Tesla used regenerative braking in its first car — The Roadster, in 2008. A year later, the same mechanics of the system were implemented in Formula 1. It is called KERS, which stands for Kinetic Energy Recovery System. It provides such a horsepower boost that it was banned for a season before being regulated the following year. However, this advanced system dates back to the late 1800s.

The Sprague Electric Railway and Motor Company is the earliest known use of the technology in 1886. General Electric used regen in 1936 in its locomotives, and Oerlikon, a Swiss company utilized some components of the system in its gyrobus. The Amitron, a concept electric car created by the American Motor Car Company included regenerative braking in its designs. Toyota introduced the technology to its brand with the Prius Hybrid in 1997 and GM's EV1 had regen when the company sent the cars to the crusher.

Regenerative braking is now a staple of the electric vehicle experience, not only reducing maintenance costs but also improving the vehicle's range and letting drivers accelerate and slow down with a single pedal.

Tesla’s Q2 2025 Earnings Call: What to Expect and Top Questions

By Karan Singh
Not a Tesla App

Another quarter has passed, and that means it’s time to submit questions and vote for Tesla’s Q2 2025 Earnings Call. While Q1 was a tough quarter for the company, Q2 saw some recovery in sales, although there’s still some work to be done.

However, there’s always a lot to be excited about during Tesla’s Q&A session, where we usually learn a lot about future software improvements and upcoming vehicles. We may hear more about FSD Unsupervised, Robotaxi, or the more affordable vehicle, or its upcoming larger 6-seater Model Y, the Model Y L. Tesla also mentioned a potential FSD price hike back in the Q1 2025 Earnings Call, so that could be something that is brought up as well.

Tesla’s Q2 So Far

Tesla has already released their Q2 2025 Production and Delivery numbers, which were up from Q1 of this year, but still down compared to Q2 last year.

Production

Deliveries

Model 3/Y

396,835

373,728

Model S, X, and Cybertruck

13,409

10,394

Total

410,244

384,122

How to Submit & Vote

Tesla lets shareholders submit a question that will be voted on and may be answered during the Q&A session. To submit your own question or vote on an already submitted question, you’ll need to be a verified shareholder. You can go to Say’s platform and link your brokerage accounts.

Once it is verified, you’ll be able to log in and vote your shares on your own question, or on someone else’s question.

Here’s the link to get started on Say’s Tesla Q&A. You must submit your questions and votes by July 23rd, 2025, at 4:00 PM EDT.

Top Questions So Far

Unsurprisingly, people have already been submitting questions, and here are the top ones so far. 

  1. Can you give us some insight how robotaxis have been performing so far and what rate you expect to expand in terms of vehicles, geofence, cities, and supervisors?

  2. What are the key technical and regulatory hurdles still remaining for unsupervised FSD to be available for personal use? Timeline?

  3. What specific factory tasks is Optimus currently performing, and what is the expected timeline for scaling production to enable external sales? How does Tesla envision Optimus contributing to revenue in the next 2–3 years?

  4. Can you provide an update on the development and production timeline for Tesla’s more affordable models? How will these models balance cost reduction with profitability, and what impact do you expect on demand in the current economic climate?

  5. Are there any news for HW3 users getting retrofits or upgrades? Will they get HW4 or some future version of HW5?

  6. When do you anticipate customer vehicles to receive unsupervised FSD?

And here are some other ones we found interesting:

  • Have any meaningful Optimus milestones changed for this year or next and will thousands of Optimus be performing tasks in Tesla factories by year end?

  • Are front bumper cameras going to be necessary for unsupervised full self driving? If so, what is the companies plan to retrofit vehicles that do not have them?

  • Will there be a new AI day to explain the advancements the Autopilot, Optimus, and Dojo/chip teams have made over the past several years. We still do not know much about the HW4.

Earnings Call Details

Tesla will hold its earnings call on Wednesday, July 23rd, at 4:00 PM EDT. It's still early for an access link, but we’ll make sure we have a link up on the site before the earnings call that day.

If you do miss the earnings call, no worries. We will provide a full recap following the call, and we’ll also do some in-depth dives into what was said and what we know.

First Look at Tesla’s 2025.26 Update [Photos + Videos]

By Karan Singh
DirtyTesla

Tesla’s Summer Update, 2025.26, has finally launched, bringing with it a batch of interesting new features for some, and a bunch of quality-of-life improvements for everyone else.

Grok AI Assistant

The star of the Summer Update is Grok, xAI’s conversational AI assistant, which has now landed in Tesla vehicles. For now, it's available in any Tesla that has an AMD processor and is potentially coming to Intel-based vehicles in the near future. The feature is also only available in the U.S., but it’s expected to expand to other regions — hopefully soon.

Grok is in its first iteration as an in-vehicle assistant, and for now, cannot control the vehicle, which means that Tesla’s voice command system is still intact. However, there is a lot it can do already. Grok is activated by pressing and holding the voice button (right scroll wheel on older vehicles), while a short press of the button is still reserved for voice commands. Grok will support a wake word in the future, letting you activate it without pressing a button.

Grok Options

Once Grok is open, which can also be done by tapping the Grok app icon, users can tailor the AI personality according to their preferences by selecting a persona and voice of their choice.

There are also several other settings for Grok under the settings button. You can enable NSFW mode, Kids Mode, or disable access to your vehicle’s location.

Grok has contextual awareness of your vehicle location, which means it can provide relevant answers to questions like “Where should I go for dinner?”

Logging In Not Required

Grok is free with Premium Connectivity, or if you’re using your phone’s hotspot feature or connected to WiFi, so anyone can try it for free. In fact, you don’t even need to log in to start using Grok. However, logging in adds some additional features.

If you’d like to log in, you can do so by scanning the QR code in the vehicle, which will provide chat management and transcripts, SuperGrok access (if you pay for a subscription), and better privacy control.

Light Sync

Tesla has added a new Light Sync feature that pulses the vehicle’s ambient lighting in sync with the music being played. This option is turned on under Toybox > Light Sync. There are also a few options, including the ability to match the ambient light colors to the album’s artwork, instead of using your selected color.

In addition, in Park you can enable Rave Cave when parked, which cranks up the ambient lighting brightness to the maximum.

Dashcam App Update

The Dashcam app now allows you to adjust playback speeds, just like the older Dashcam Viewer, which is still used on Intel-based vehicles.

In addition to adjusting playback speed, you can now adjust the video view so that it’s displayed without being obstructed by the buttons at the top (video below). The difference is small, but could be useful if you’re trying to see something slightly out of view or that’s hidden behind the top Dashcam buttons.

While the Cybertruck has also received the updated Dashcam Viewer with this update, it does not have the new B-pillar camera recordings like other HW4 cars.

Sentry Mode Glow

Sentry Mode is getting one of the best uses of the vehicle’s ambient lighting that we’ve seen so far. The ambient lighting will now slowly pulse red while Sentry Mode is activated to grab someone’s attention, instead of just relying on the vehicle’s display.

While you can disable Sentry Mode sounds, we’d love to see an even more stealthy Sentry Mode that also disables the ambient lighting and screen, allowing the vehicle to record without anyone being aware.

Since the ambient lighting is being used in this case to make people more aware of a feature, Tesla could also use it in other modes, such as Dog Mode.

There are a lot of potential uses for ambient lighting. Tesla can make it glow while the vehicle is charging, with the brightness potentially related to the vehicle's charge level.

Supercharger Site Info at Arrival

When you navigate to a Supercharger, new icons in the charger list will indicate locations that require valet service or pay-to-park access.

Upon arrival at the location, a notification will appear on your screen, displaying important details such as access codes, parking restrictions, level/floor information for parking garages, and restroom availability. This information will also be available on the site card in the navigation.

Equalizer Presets

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Tesla has moved the audio settings from the music player, directly into the vehicle settings — making them much easier to find. In addition to creating a new “Audio” section in settings, you can now create and save equalizer presets.

Each preset can have a name, custom EQ settings, and a setting for immersive audio.

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Onboarding Guide

Not a Tesla App

Tesla has introduced a new Onboarding Guide for new owners. The guide covers driver settings, touchscreen use, steering wheel and seat setup, and how to control key portions of the vehicle, including lights, wipers, and Autopilot features.

The Onboarding Guide is automatically initiated when a new owner accepts delivery of a Tesla, or can be manually initiated at any time by going to Controls > Service > Onboarding Guide.

This appears to only be available for the new Model 3 and new Model Y.

Rollout

Update 2025.26

FSD Supervised 12.6.4 & 13.2.9
Installed on 1.5% of fleet
59 Installs today
Last updated: Jul 19, 12:25 am UTC

In typical Tesla fashion, this 2025.26 update is rolling out gradually in small waves initially. Three waves have already gone out, so all signs are looking good for it going into a wide release soon.

Latest Tesla Update

Confirmed by Elon

Take a look at features that Elon Musk has said will be coming soon.

Tesla Videos

Latest Tesla Update

Confirmed by Elon

Take a look at features that Elon Musk has said will be coming soon.

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