How Tesla's Regenerative Braking Works

Tesla offers three stopping modes

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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

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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?

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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.

Elon Musk Takes Over Tesla Sales For North America and Europe

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Following the recent departure of longtime deputy Omead Afshar, Elon Musk has stepped up to personally oversee Tesla’s sales operations in North America and Europe, according to a new report from Bloomberg, which cites people familiar with the matter.

This is a big shake-up that places Elon directly in charge of fixing Tesla’s sales slump in two key markets. The move has come as Tesla reported nearly on-the-ball deliveries for Q2 2025, hitting 384k deliveries, against a consensus street estimate of 385k deliveries.

New Leadership Structure

According to the report, Afshar’s former responsibilities are being divided between Elon and Senior VP Tom Zhu. Elon will now directly oversee the sales organizations in the US and Europe. As part of this change, Troy Jones, Tesla’s VP of North America Sales, will now report to Elon.

Tom Zhu, who is based in China, will continue to manage sales in Asia while also taking on the critical new responsibility of overseeing global manufacturing operations. Leadership of Tesla’s factories in Fremont, California, and Texas will now report to Tom. Tesla Energy’s factories will still report to Michael Snyder, VP of Energy and Charging.

For now, we’re unsure whether this is a temporary management structure, if the reporting lines will shift, or if Tesla will either hire or promote a new Senior VP of Sales to cover the duties.

Tackling the Sales Slump

The restructuring is a response to the recent downturn in sales. Analysts estimated that Tesla would deliver approximately 385k vehicles, which they essentially managed to achieve. However, deliveries fell short of production numbers, with Tesla delivering just 373k of the 410k vehicles produced.

This situation is particularly challenging in Central Europe. Europe has been noted as Tesla’s weakest market, according to Elon. Interestingly, Elon previously stated in several interviews over the last few months that there was no demand issue, but it now seems that there have been some issues with growing sales.

With Tesla’s new vehicle registrations across Europe having plunged 37% since the start of this year, and the rollout of the new affordable model, as well as more affordable versions of the Model 3 and Model Y seemingly delayed, there is a lot to do. Some analysts are projecting a second consecutive annual decline in Tesla’s global car sales for 2025.

The Rise of Tom Zhu

A key note in this reshuffle is the return of Tom Zhu to a top global operations role. Tom had previously led the construction and ramp-up of Giga Shanghai and was then promoted to Senior VP of Automotive Operations in 2023. Last year, he was sent back to China to focus on tackling regulatory hurdles with the launch of FSD in China.

His return to overseeing global manufacturing, even while staying in China, is a significant vote of confidence in his abilities. It also comes as Chinese authorities have begun drafting new autonomy guidelines to clear a path for the broader rollout of both Supervised and potentially Unsupervised FSD.

Wrap Up

This major restructuring shows that Elon is once again focused on Tesla and plans to personally tackle the company’s biggest issues. This will require a careful hand, as Elon’s forays into politics have caused self-admitted brand damage. If anyone can turn this around and have the Model Y return as the Best-Selling Vehicle of 2026, having just missed out by a few thousand vehicles to the Toyota RAV4, it is Elon.

Alongside him, Tom Zhu will be responsible for streamlining global manufacturing and ensuring that Tesla is ready to launch their new affordable variants in the near future, which should also make a considerable dent in sales.

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Tesla Shares Q2 2025 Numbers: Production and Deliveries Up Over Last Quarter

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Tesla has released its Q2 2025 production and delivery numbers, revealing an improvement in production and deliveries over Q1, but still down from a year ago.

Tesla produced 410,244 vehicles in Q2, nearly equal to their production a year ago, which was 410,831 vehicles. Production for this quarter was significantly up compared to Q1 2025, which only saw 362,615 vehicles produced. While production numbers matched those of a year ago, actual deliveries were down.

Q2 2025 saw Tesla deliver 384,122 vehicles, which was down approximately 59,000 units compared to the same period last year, but up by approximately 48,000 vehicles, or about 14% compared to Q1.

Breakdown by Model

The Model 3/Y segment continues to dominate Tesla’s production profile, accounting for 396,835 units produced and 373,728 delivered in Q2 2025. Deliveries for the “Other Models” category—which includes the Cybertruck, Model S, and Model X—were down compared to the previous quarter, with just 10,394 vehicles delivered, a 20% decline. Compared to a year ago, the drop for these vehicles is even more drastic, with sales being down 52%. Tesla refreshed its Model S and Model X last month with new features; however, the update was much smaller than expected and likely didn’t help much in increasing sales for these vehicles.

Tesla doesn’t break down Cybertruck sales separately, but those deliveries are expected to be down as well.

Tesla noted that 2% of total deliveries this quarter were accounted for under operating lease agreements, consistent with the same quarter last year.

Context and Market Response

While the numbers exceeded some bearish expectations, the year-over-year delivery drop is Tesla’s second straight quarterly decline. Analysts attribute declining sales to increasing EV competition and reputation issues.

Still, investors found relief in the improved quarter when compared to Q1. The stock rebounded about 4% yesterday on the news.

Looking ahead, all eyes are on Tesla’s Robotaxi network, the Cybercab, and the more affordable model, which is slated to be released later this year.

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