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SpaceX is halfway done building the world’s largest rocket booster

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New photos of the SpaceX Starship program’s first Super Heavy confirm that the booster prototype – known as Booster Number 1 (BN1) and set to become the largest rocket booster ever built – is already halfway complete.

Set to be the world’s tallest, heaviest, and most powerful liquid rocket booster ever built, Super Heavy is expected to measure some 70 meters (~230 ft) tip to tail, weigh ~3700 metric tons fully fueled, and produce around 7500 metric tons (16.5 million lbf) of thrust at liftoff. Starship, the reusable upper stage and spacecraft SpaceX is busy prototyping and testing, is 40% shorter than Super Heavy and features less than a quarter as many Raptor engines, producing thrust roughly equivalent to Falcon 9’s first stage.

Aside from a three or four-ring engine section, every subsection of the first Super Heavy booster is complete and awaiting assembly. (NASASpaceflight – bocachicagal)

Super Heavy will be equivalent to almost ten Falcon 9s at full thrust and outclass every rocket ever built. However, the basic design of the booster is effectively the same as any other liquid-fueled rocket, opting for a tall and thin Falcon-style cylinder with a high aspect ratio and no exterior coating – just bare metal.

Super Heavy’s airframe is made up of two main propellant tanks joined by a “common dome” and capped at both ends with an interstage (the structure that mates the booster to Starship) and engine/skirt section (encloses the thrust dome, supports landing legs, and houses umbilical ports).

The Interplanetary Transport System (ITS), circa 2016. While heavily outdated, it still serves as a good representation of Super Heavy’s basic layout. (SpaceX)
Starship and Super Heavy, circa 2019. (SpaceX)

While Super Heavy is dramatically different from Starship by almost any measure, SpaceX has ensured that hardware commonality is as extensive as possible. Ultimately, with minor tweaks, that means that SpaceX can (in theory) build Super Heavy with the exact same tools and techniques it’s used to churn out Starship prototypes.

As of the end of this month, a flurry of public photos from local (and visiting) photographers have confirmed that Super Heavy booster BN1 is effectively halfway to completion and currently stands 18 steel rings tall. Aside from booster-specific layout changes, that 33-meter-tall (~105 ft) barrel section is virtually identical to a Starship’s 20-ring barrel section, lacking only conical nose section that caps them off.

The bulk of Super Heavy BN1’s liquid oxygen (LOx) tank is lifted beside Starship SN10. (NASASpaceflight)

The 18-ring stack also guarantees that the current assembly is Super Heavy BN1’s liquid oxygen (LOx) tank and confirms that like ITS, BFR, Falcon 9, and other SpaceX rockets, Super Heavy’s LOx tank will sit above its fuel (methane) tank. Likely either 38 or 39 rings tall overall, it also indicates that BN1 is a ring away from half of its full height, leaving the integration of its strengthened methane tank, custom engine section, and skirt as the last major tasks standing between SpaceX and its first Super Heavy prototype.

Bearing attachment points for four Raptor engines and unfinished cutouts for four more, the first Super Heavy thrust dome appears to be complete and awaiting its sleeve of steel rings. (NASASpaceflight – bocachicagal)
Meanwhile, Super Heavy BN1’s common dome section appears to be ready to join the rest of its assembled LOx tank any day now. (NASASpaceflight – bocachicagal)

According to Elon Musk, SpaceX will likely hop BN1 if or when it passes initial cryogenic proof and static fire testing. If that goes according to plan, it’s unclear if BN1 can be converted for two-stage Starship launch attempts or if SpaceX will simply move on to BN2 (already under construction).

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Eric Ralph is Teslarati's senior spaceflight reporter and has been covering the industry in some capacity for almost half a decade, largely spurred in 2016 by a trip to Mexico to watch Elon Musk reveal SpaceX's plans for Mars in person. Aside from spreading interest and excitement about spaceflight far and wide, his primary goal is to cover humanity's ongoing efforts to expand beyond Earth to the Moon, Mars, and elsewhere.

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Tesla Australia Exec: No regulatory barriers for FSD release

Tesla’s FSD demonstrations have been quite impressive as of late.

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Credit: Tesla AI/X

Recent comments from Tesla’s Country Director for Australia and New Zealand Thom Drew have provided an exciting update for Full Self Driving’s upcoming release in Australia. As per the executive, there is currently no regulatory barrier to FSD being rolled out to Australian roads.

Drew’s comments came on the heels of a video demonstration featuring FSD Supervised navigating Melbourne’s central business district.

Tesla FSD’s Australia Demo

Shared by the Tesla AI team’s official account on social media platform X, FSD Supervised’s demonstration in Melbourne’s central business district sparked a lot of conversations online. Electric vehicle enthusiasts on X were quite impressed with the system’s capabilities to handle the city’s busy and crowded streets. Even more were pleasantly surprised when FSD Supervised performed a smooth hook turn in its demonstration.

In a comment to News.com.au, Drew emphasized that FSD’s global expansion is a priority for Tesla. “That’s Elon’s push. We have a global engineering team that are working across markets around a lot of FSD… actively working across all our markets to roll it out,” the executive noted.

No Regulatory Barriers 

Interestingly enough, Drew also stated that there is no regulatory barrier to FSD hitting Australia’s roads. This suggests that FSD may be released in Australia once Tesla is satisfied with the local calibration and performance of the system on the country’s inner city streets.

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“There’s currently no blockers in Australia to releasing Full Self Driving Supervised, as we have in North America. It’s something our business is working on releasing. I don’t have a timeline currently for you, but it’s certainly very exciting to be able to bring that to a market that doesn’t have a regulatory blocker,” Drew stated.

Tesla’s FSD demonstrations have been quite impressive as of late, with the company also publishing a video showing the system navigating France’s Arc de Triomphe, one of Europe’s most complicated roundabouts, recently. Over in China, a Tesla Model 3 owner also used FSD to travel almost 2,485 miles from the Henan Province to the base camp of Mt. Everest.

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Tesla China registrations bounce back to 11.1k vehicles in May’s 2nd full week

Tesla China’s domestic vehicle registrations have been volatile in recent weeks.

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Credit: Tesla China

Tesla reported 11,130 insurance registrations in China in the week of May 12-18, 2025. These represent a 262.5% increase from 3,070 registrations that the company saw in the week ending May 11.

Tesla China’s domestic vehicle registrations have been volatile in recent weeks, suggesting that Giga Shanghai may still be exporting Model 3 and Model Y vehicles to foreign territories this month.

Tesla China’s Registrations

In the week ending May 4, Tesla China saw 7,300 new vehicle registrations. This was not that surprising considering that Tesla may still be allocating Gigafactory Shanghai’s output to vehicle exports. In the week ending May 11, however, industry watchers were quite surprised to see just 3,070 registrations from Tesla China. 

The 262.54% bounce in vehicle registrations in the week ending May 18 is thus a pleasant update from the world’s biggest and most competitive electric vehicle market. Even with these results, however, industry watchers still note that Tesla China’s registrations this 2025 are still down 6.5% year-over-year.

Tesla China does not report its weekly sales figures, though the company’s overall performance in the domestic automotive sector can be inferred through new vehicle registration data. Fortunately, these registrations are closely tracked by industry watchers, as well as local automakers such as Li Auto.

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Domestic Sales and Exports

Following the start of domestic deliveries of the new Model Y in China, expectations were high that the company would see a steady rise in registrations this second quarter. Giga Shanghai does not only supply vehicles to the domestic Chinese market, after all, as the facility also serves as the company’s primary vehicle export hub, providing Model 3 sedans and Model Y crossovers to several territories.

Tesla China sold 28,731 vehicles domestically and exported 29,728 vehicles in April. In comparison, the company saw 74,127 domestic registrations and 4,701 exports in March 2025, as per data compiled by CNEV Post. Considering Tesla China’s registrations this May, it would not be surprising if the company’s exports this month would exceed March’s 4,701 units.

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xAI receives more Tesla Megapacks for Colossus 2

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xAI is bolstering its Colossus 2 data center in Memphis with 168 Tesla Megapacks, enhancing the energy infrastructure for its ambitious AI supercomputer expansion. The deployment underscores xAI’s push to lead AI innovation while addressing environmental concerns.

The first Colossus site is connected to a 150 megawatts (MW) substation powered by MLGW and TVA. It is supported by approximately 156 Megapacks, providing 150 MW of stored energy backup to xAI’s supercomputer. The 168 Tesla Megapacks recently delivered to xAI’s Memphis site will provide battery storage backup to Colossus 2.

In December 2024, xAI doubled the capacity of Colossus to 200,000 Nvidia H100 GPUs, which consumes 250 MW of power–enough to energize 250,000 homes. In March 2025, the AI company bought a 1-million-square-foot site in Whitehaven, Memphis, for $80 million. xAI’s Whitehaven site could host up to 350,000 GPUs with the potential to deploy the largest number of Tesla Megapacks for backup power.

xAI plans to scale Colossus up to 1 million GPUs to create the world’s largest AI supercomputer. A 1-million-GPU setup would require over 1 gigawatt, about one-third of Memphis’s peak summer demand.

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Initially reliant on natural gas turbines, Colossus faced criticism for nitrogen oxide emissions. The 150 MW substation, completed in early 2025, reduced turbine use by half, with Megapacks providing cleaner backup power. By fall 2025, xAI expects the second substation to come online. Once the second substation is online, the remaining turbines will only be used for backup, reducing the project’s carbon footprint.

Tesla Energy’s Q1 2025 performance, with a 156% year-over-year increase and 10.4 GWh of storage deployed, supports xAI’s needs. Tesla’s Megapack factory in Waller County, Texas, set to create 1,500 jobs, signals further commitment to scaling energy solutions for projects like Colossus.

xAI’s rapid expansion, backed by Tesla Megapacks, positions it to rival AI leaders like OpenAI and Google. The Colossus 2 deployment reflects a strategic blend of cutting-edge AI and sustainable energy. As Memphis’ infrastructure adapts to unprecedented power demands, xAI and Tesla are reshaping the AI landscape with a focus on efficiency and environmental responsibility.

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