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Tesla’s ‘Roadrunner’ facility gets a neighbor working on tech beyond the million-mile battery
As the wait for Tesla’s Battery Day continues, more and more speculations are abounding about what the electric car maker might reveal during the highly-anticipated event. Elon Musk has stated that Battery Day’s announcements will be mind-blowing, and based on apparent clues recently observed by the Tesla community, it appears that the CEO may be right on the money.
Recent reports have indicated that Amprius, a battery company currently working on silicon nanowire tech, recently relocated its headquarters to a site that’s just a few hundred feet away from Tesla’s Roadrunner battery facility in Kato Road, Fremont. Considering the firm’s focus, its new headquarters’ rather convenient location, and Elon Musk’s previous references to the use of silicon in batteries, there seems to be a fair chance that Amprius’ move to Fremont may be more than a coincidence.
Amprius notes that it is working on creating silicon nanowires for battery anodes that dramatically improve battery weight and density. The company’s website notes that silicon generally has about 10x the capacity of graphite (carbon), but it has a big drawback in the way that it swells when it’s charged, causing the silicon to fracture. To address this, Amprius utilizes silicon nanowires, which keeps the silicon from fracturing and breaking apart even when it swells.
As noted by EV enthusiast and YouTube host Driving Delta, Elon Musk himself appears to be teasing the use of advanced silicon tech on Twitter last month. In one of his posts, Musk shared some lyrics of the song “Lithium” by Nirvana, whose refrain includes sections that state “I’m not gonna crack.” Granted, Musk may simply be trolling the Tesla community with his posts, but it should be noted that he also talked about the increasing use of silicon anodes five years ago.
“We’re shifting the cell chemistry for the upgrade battery pack to partially use silicon in the anode. This is just a sort of baby step in the direction of using silicon in the anode. We’re still primarily using synthetic graphite, but over time, we’ll be using increasing amounts of silicon in the anode,” Musk noted during a 2015 conference call.
As noted by Amprius’ on its website, the use of 100% silicon paves the way for batteries with the highest energy density, perhaps even at the 500 Wh/kg level. That’s enough to start exploring electric VTOL projects, a topic that Elon Musk has admitted is something that truly interests him. That being said, Professor in Energy Materials and Technologies Ying Shirley Meng, who has made significant contributions to Maxwell Technologies’ battery tech herself, believes that challenges still remain in the use of silicon nanowires.
“We should pay attention to the cost per kg. Even (if) those nanowires work (which I doubt), to produce consistent quality in metric ton scale at 10$ per kg it will be sci-fi for now,” she noted.
Elon Musk, for his part, recently stated that the technology that could allow 400 Wh/kg with a high life cycle and volume production is not too far away. Musk gave a rough timeframe for the technology, stating that such milestones could be achieved in about three to four years.
Tesla’s Battery Day event is expected to introduce the company’s next-generation lithium-ion cells, though speculations suggest that these batteries — which are expected to last a million miles — are based largely on Maxwell Technologies’ dry electrode tech. Maxwell itself has previously noted that it could offer batteries with 300 Wh/kg while stating that it had also identified a path to 500 Wh/kg. With this in mind, it appears that Tesla may already be setting the stage for cells that will likely go even beyond the million-mile battery.
Granted, Amprius’ move to Fremont may be unconnected to Tesla. That being said, the two companies’ goals to align with each other, and Elon Musk’s own references to the use of silicon suggests that Tesla will likely get a lot of value from Amprius’ tech. If speculations prove true, the path to batteries that go even further than the million-mile mark may be feasible in the near future. Such innovations are key to Tesla’s goal of accelerating the transition to sustainable energy, after all.
Watch these recent takes on the Amprius rumors in the videos below.
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Tesla robotaxi test details shared in recent report: 300 operators, safety tests, and more
Tesla has launched an initial robotaxi service for its employees in Austin and the San Francisco Bay Area.

During the Q1 2025 earnings call, Tesla executives reiterated the idea that the company will be launching a dedicated robotaxi service using its Full Self Driving (FSD) Unsupervised system this coming June.
A recent report from Insider, citing people reportedly familiar with the matter, has now provided a number of details about the preparations that Tesla has been making as it approaches its June target date.
Remote Operators
As noted by the publication, about 300 test operators have been driving through Austin city streets over the past few months using Teslas equipped with self-driving software. These efforts are reportedly part of “Project Rodeo.” Citing test drivers who are reportedly part of the program, Insider noted that Tesla’s tests involve accumulating critical miles. Test drivers are reportedly assigned to specific test routes, which include “critical” tracks where drivers are encouraged to avoid manual interventions, and “adversarial” tracks, which simulate tricky scenarios.
Tesla has launched an initial robotaxi service for its employees in Austin and the San Francisco Bay Area, though the vehicles only operate in limited areas. The vehicles also use safety drivers for now. However, Tesla has reportedly had discussions about using remote operators as safety drivers when the service goes live for consumers. Some test drivers have been moved into remote operator roles for this purpose, the publication’s sources claimed.
While Tesla is focusing on Austin and San Francisco for now, the company is reportedly also deploying test drivers in other key cities. These include Atlanta, GA, New York, NY, Seattle, WA, and Phoenix, AZ.
Safety Tests
Tesla reportedly held training events with local first responders as part of its preparations for its robotaxi service, Insider claimed, citing documents that it had obtained. As per the publication, Tesla had met with the city’s autonomous vehicle task force, which include members of the Austin Fire Department, back in December.
Back in March, Tesla reportedly participated in about six hours of testing with local first responders, which included members of the fire department and the police, at a close test track. Around 60 drivers and vehicles were reportedly used in the test to simulate real-world traffic scenarios.
Interestingly enough, a spokesperson from the Austin Police Department stated that Tesla did hold a testing day with emergency responders from Austin, Williamson County, as well as the Texas Department of Public Safety.
Reported Deadlines
While Tesla has been pretty open about its robotaxi service launching in Austin this June, the company is reportedly pursuing an aggressive June 1 deadline, at least internally. During meetings with Elon Musk, VP of AI software Ashok Elluswamy’s team reportedly informed the CEO that the company is on track to hit its internal deadline.
One of Insider’s sources, however, noted that the June 1 deadline is more aspirational or motivational. “A June 1 deadline makes a June 30 launch more likely,” the publication’s source noted.
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Atty who refused to charge six-time Tesla vandal sparks controversy
Despite the multiple offenses, Moriarty opted to enter Adams into an adult diversion program instead.

Hennepin County Attorney Mary Moriarty, who made the decision not to charge 33-year-old vandal Dylan Bryan Adams after he keyed six Teslas around Minneapolis last month, has found herself in the middle of controversy.
The controversy came amidst her decision to press charges against a 19-year-old first-time vandal who keyed one vehicle at the White Castle in Brooklyn Park.
The Tesla Vandal
Moriarty’s decision not to charge Adams after he keyed six Teslas was met with widespread criticism. Adams’ actions resulted in more than $20,000 worth of damages, more than $10,000 of which was to a single vehicle, as noted in a New York Post report. Yet despite the multiple offenses, Moriarty opted to enter Adams into an adult diversion program instead.
The fact that Adams is a state employee who works for the Department of Human Services as a program consultant triggered allegations that his dismissal might be partly influenced by Gov. Tim Walz. Walz is a staunch critic of Musk, previously stating that the falling price of TSLA stock gives him a “boost” in the morning.
As noted in a report from The Minnesota Star Tribune, Moriarty’s decision was so controversial that she was asked about the matter on Wednesday. In response, the attorney argued that her office made the decision outside of any political consideration. “We try to make decisions without really looking at the political consequences. Can we always predict how a story will be portrayed in the media or what people will say? No,” Moriarty stated.
Actually Charged
As noted by the Tribune, Moriarty has made arguments around the fact that Adams was a first-time offender, even if he opted to deface six separate Teslas. But even this argument has become controversial since Moriarty recently charged a 19-year-old Robbinsdale woman with no criminal record with first-degree felony property damage after she allegedly keyed a co-worker’s car. The damage incurred by the 19-year-old woman was $7,000, substantially less than the over $20,000 damage that Adams’ actions have caused.
Cases surrounding felony first-degree property damage are fairly common, though they require the damage to be over $1,000. The 19-year-old’s damage to her co-worker’s car met this threshold. Adams’ damage to the six Teslas he vandalized also met this requirement.
When Moriarty was asked about her seemingly conflicting decisions, she noted that her office’s primary goal was to hold the person accountable for keying the vehicle and get restitution to the people affected. She also noted that her office tries to avoid convictions when possible since they could affect a person’s life. “Should we have treated this gentleman differently because it’s a political issue? We made this decision because it is in the best interest of public safety,” she noted.
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Tesla faces emission credits tax in Washington state
House Bill 2077 taxes emissions credits, mainly hitting Tesla. Lawmakers expect $100M/year from the taxes.

Washington state lawmakers are advancing a bill that would tax Tesla’s emission credits, targeting profits under the state’s clean vehicle policy. Lawmakers who support the bill clarify that the Tesla credit tax is unrelated to Elon Musk.
HB 2077, introduced in mid-April, seeks to impose a 2% tax on emission credit sales and a 10% tax on banked credits. The bill primarily affects Tesla due to exemptions for companies with fewer credits.
In 2022, Washington’s Department of Ecology mandated that all new cars sold by 2035 be electric, hydrogen-fueled, or hybrids, with 35% compliance required by next year. Carmakers selling more gas-powered vehicles can buy credits from companies like Tesla, which sells only electric vehicles.
A legislative fiscal analysis projects taxes on those credits would generate $78 million in the 2025-27 biennium and $100 million annually thereafter. About 70% of the taxes will be allocated to the state’s general funds, and the rest will help expand electric car infrastructure.
HB 2077 passed the state House eight days after its introduction and awaits a Senate Ways and Means Committee vote on Friday. At a House Finance Committee hearing, supporters, including union and social service advocates, argued the tax would prevent cuts to state services.
House Majority Leader Joe Fitzgibbon emphasized its necessity amid frozen federal EV infrastructure funds. “We didn’t have a budget crisis until this year. And we didn’t have the federal government revoking huge amounts of federal dollars for EV infrastructure,” he said.
Tesla’s lobbyist, Jeff Gombosky, countered that the proposal “runs counter to the intent” of the state’s zero-emission policy. Rivian’s lobbyist, Troy Nichols, noted a “modest” impact on his company but warned it could undermine the EV mandate. Kate White Tudor of the Natural Resources Defense Council expressed concerns, stating, “We worry it sets a dubious precedent.”
Fitzgibbon defended the tax, noting Tesla’s dominant credit stockpile makes it “one outlier” that is “very profitable.” “That’s the kind of thing legislators take an interest in,” he said. “Is it serving the interest of the public for this asset to be untaxed?”
With the legislative session nearing its end, the bill remains a key focus in budget talks in Washington.
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