Elon Musk confirms Tesla Semi has battery pack around 900 kWh, but more answers are needed
Elon Musk has confirmed Tesla Semi’s efficiency at 1.7 kWh per mile, which means it has a roughly 900 kWh battery pack. It’s an important piece of information, but there are still more questions to answer before Tesla Semi can officially be a truly disruptive product.
Yesterday, Tesla unveiled the production version of its Tesla Semi class 8 electric truck and delivered the first units.
At the event, Tesla described an electric truck that could truly disrupt the trucking industry.
However, we noted that there were a few pieces of information that Tesla omitted from the event that could really be major difference makers.
The two main ones are the weight of the actual truck and its price:
The trucking industry is all about the economics of moving products by the pound. The main thing that will drive that is the cost of operation per mile, which is mainly affected by the vehicle’s efficiency.
Tesla has already reported an efficiency under 2 kWh per mile which is impressive, but not exactly clear when you are trying to determine your cost per mile for electricity.
On Twitter last night, Tesla CEO Elon Musk confirmed that it is 1.7 kWh per mile. That’s more precise, and truck operators can input their electricity rates to get an idea of fuel costs and savings compared to diesel.
It also gives us an idea of the Tesla Semi’s battery pack. It’s not perfect since we don’t have the exact range of the truck. At 500 miles, which Tesla claims, that’s 850 kWh, but the pack generally has a buffer, and based on the 500-mile trip it completed, it looks like the electric truck might have some more in it.
Now what we need to know is how much cargo can a Tesla Semi carry. A class 8 truck fully loaded needs to weigh 80,000 pounds or less as per regulations, but electric trucks have been allowed an extra 2,000 pounds.
In order to know that, we need to know the weight of the truck itself. You have to deduct the weight of the trailer, which is about 10,000 pounds for a 53-foot trailer, and the weight of the truck from the 82,000-pound limit.
Tesla says that it will roughly have the same capacity as a diesel truck, but diesel tractors have a wide range of weight from roughly 12,000 to 25,000 pounds. The Tesla Semi’s power would certainly need to be compared more to the higher end of that range, but at the end of the day, trucking companies want as much cargo capacity as possible.
The automaker hasn’t confirmed the weight of the Tesla Semi, but we can deduce from its load test with concrete blocks that it is around 27,000 pounds, but that’s unconfirmed at this point.
That’s not the best, but it would still give the Tesla Semi the capacity to move about 45,000 pounds of cargo, which still makes the vehicle super useful. Also, it is safe to assume that the number will improve greatly over the years as battery technology improves.
But nonetheless, it would be useful if Tesla could confirm the weight of the Tesla Semi.
Then we need the actual price of the truck. In 2017, Tesla said the trucks would be $150,000, $180,000, and $200,000, depending on the model, but those prices are expected to have changed over the last five years.
Those prices with that capacity would make the Tesla Semi revolutionary since it would pay itself back in about three years just from fuel savings in most markets, but we don’t know that for a fact without the official price.
Electrek’s Take
This is pretty wild. We are super close to being able to confirm that the Tesla Semi can change the entire paradigm of the trucking industry, but Tesla just needs to release a few more pieces of information to make it happen.
The fact that Tesla doesn’t let the press into its events and only superfans is really a bad look for the company at this point. Yes, the press can be annoying, even malicious in some cases, and I don’t say they should let those people in, but there are also plenty of people whose goal is just to keep their readers as best informed as possible, and they would ask important questions at those events that need answering – questions that a lot of fans don’t bother asking. Everything Musk says is good enough for them.
I can’t ask any of those questions because Tesla doesn’t have a PR department, and the only official comments you can get these days are from Musk on Twitter, where he blocks me and surrounds himself with sycophants:
This is just not how a company that aims to be transparent should operate. And obviously, I’m not talking about trade secrets here.
Anyway, the rant is over. I hope Tesla is going to release that information soon, and if it is on the right side, I’ll be the first to celebrate Tesla revolutionizing the trucking industry.
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An Angus ranch in southern Oregon has become the test case for a new kind of cattle-friendly solar, hosting RUTE SunTracker’s first commercial project.
The one‑acre, 120‑kilowatt array is the first real‑world installation of RUTE’s patented, cable‑stayed solar tracker designed specifically to coexist with grazing cattle. RUTE supplies the hardware and is also acting as the developer for its first regional cattle‑plus‑solar demonstrations.
What makes the setup different is the clearance. The tracker system provides about 10 feet of headroom, with panel heights reaching up to 16 feet across the array. That gives cattle full access to the pasture underneath while allowing ranchers to keep managing the land as usual. The project is interconnected to Pacific Power’s grid in Jackson County, Oregon.
Projects like this are getting more attention as the solar industry runs into land‑use limits. In the US alone, about 30 gigawatts of new solar capacity installed last year covered roughly 150,000 acres. Meanwhile, the country has close to 120 million acres of cattle pasture, much of it facing rising heat and water stress.
That’s where agrivoltaics come in. By adding solar to working pastureland, ranchers can create a second revenue stream while improving growing conditions for forage through partial shade.
“Within weeks of installing the RUTE canopy, the crew observed leafier forage and increased legume presence inside the array compared to outside,” RUTE president Doug Krause said. “Even on irrigated pasture, direct summer sun can be too intense.”
RUTE’s work has been supported by grants from the US Department of Energy’s American‑Made Solar Prize and the US Department of Agriculture. In October, Oregon State University’s Agrivoltaics Program began quantitative studies at the site to measure pasture production, adding hard data to what ranchers are already seeing on the ground.
Next, RUTE plans to take the project on the road. This winter, the company will present at cattlemen’s association meetings as it looks for ranch partners with onsite electric loads, such as irrigation pivot systems.
“In the near term, our focus is on regional, behind‑the‑meter installations so ranchers and power producers can see the equipment operating in real conditions,” Krause said. “While interconnection timelines are long, these projects allow us to build momentum as we connect with developers and ranches on utility‑scale pipeline.”
Read more: Sunrun + NRG launch a virtual power plant to ease Texas power demand
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Environment
Tesla rental fleet that bought into Elon Musk’s self-driving lies goes bankrupt due to depreciation
Dutch leasing company Mistergreen, known for its “Tesla only” fleet and bold bets on a future of autonomous robotaxis, is reportedly facing bankruptcy. The company’s financial collapse highlights the danger of buying into Elon Musk’s claims that Tesla vehicles would become “appreciating assets”—a prediction that has faced a harsh reality check in the used EV market.
According to reports from Europe, the Dutch Tesla-only car rental firm Mistergreen has wiped out its bondholders and is selling off its operations.
Mistergreen had built its entire business model around the premise of operating a fleet of Tesla vehicles that would not only hold their value but eventually generate revenue as robotaxis.
Instead, the company has been forced to write down millions in fleet value as Tesla aggressively cut new car prices over the last two years, pulling the rug out from under used EV prices, and never delivered on its promise of consumer vehicles becoming robotaxis.
Back in 2019, Elon Musk famously claimed that Tesla vehicles were now “appreciating assets” because of their Full Self-Driving (FSD) capability. He stated:
“I think the most profound thing is that if you buy a Tesla today, I believe you are buying an appreciating asset – not a depreciating asset.”
He even went so far as to suggest that a Tesla Model 3 could be worth $100,000 to $200,000 as a revenue-generating robotaxi. Mistergreen bought into that claim and was essentially a leveraged bet on this exact scenario.
They wrote their annual report in 2022:
Our focus is driven by the fact that Tesla’s electric vehicles are currently the highest quality electric vehicles on the market (in terms of battery quality, software updates, efficiency and range, charging network and speed), their hardware and software are prepared for future self-driving cars, and the quality and range of the Tesla (supercharger) charging network is superior. As a result, there is a significant market demand for Tesla’s and we anticipate that Tesla’s will have better residual value in the future due to the good quality of the Tesla’s currently on the market.
However, as we discussed in an article earlier this year about Elon Musk’s biggest lie, the reality has been the exact opposite. Tesla vehicles have depreciated faster than the industry average, exacerbated by Tesla’s own decision to slash prices to maintain demand and by the fact that it never delivered on its promise that software updates would make its consumer vehicles autonomous without supervision.
At its peak, Mistergreen had a fleet of over 4,000 Tesla vehicles, which is impressive, but it meant that it was hit even harder by the depreciation.
For buyers, a cheaper Tesla is great news. For owners or leasing companies holding thousands of them on their books, with high residual-value guarantees, it’s a death sentence.
Mistergreen had issued bonds to buy the Tesla vehicles, but it hasn’t been able to repay them since last year. It’s unclear how much of investors’ money has been wiped out by the bet, but it is in the tens of millions of dollars.
A couple of Dutch, Belgian, and German leasing companies will purchase the remaining fleet.
Electrek reached out to CEO Florian Minderop and co-founder Mark Schreurs for comments, but we didn’t hear back by the time of publishing.
Electrek’s Take
They believed Elon and they lost tens of millions of dollars worth of investors’ money for it.
We have been saying for years that while FSD is impressive, there’s no evidence that it can reach level 4 autonomy in consumer vehicles. Banking on it turning cars into appreciating robotaxis in the near term is financial suicide.
Musk has been promising “1 million robotaxis by the end of the year” since 2020. It’s now late 2025, and while we have seen progress, we only have a small pilot program in a geo-fenced area in Texas under constant supervision, and certainly don’t have a fleet of appreciating assets.
If you bought a Tesla for $50,000 in 2022 expecting it to be worth $100,000 today, you are likely disappointed. If you bought 4,000 of them with borrowed money, you are Mistergreen.
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Kia is offering generous discounts on its EVs with low finance rates and thousands in savings across its entire lineup.
What deals is Kia currently running on its EVs?
After launching a promotion in the US offering over $10,000 off the EV6, EV9, and Niro EV this month, Kia is now extending the savings overseas.
Kia introduced a New Year’s offer in the UK on Tuesday, offering savings across its entire range, including electric vehicles.
The new deal offers generous finance deposit contributions (FDC) of up to £3,000 ($4,000) toward all EV3 models, plus the EV4 GT-Line and GT-Line S trims. A £1,500 ($2,000) FDC is available toward the EV4 Fastback (sedan), EV5, EV6, EV6 GT, EV9, and EV9 GT. The EV4 Air grade is available with a £1,000 ($1,300) FDC.
Kia is also offering a low 3.9% APR across its entire EV lineup, considerably lower than the 5.9% APR for the new Sportage and the 7.9% APR for the Picanto, K4, Niro PHEV, and Sorento.
And that’s not all. Current Kia drivers looking to upgrade can save an extra £1,000 ($1,300) with the “Kia EV Finance Upgrade” loyalty incentive.
The New Year’s EV deals run from December 17, 2025, to March 31, 2026. Kia is also offering two years of free service on all electric models through its “Discover Your Kia EV” campaign, available on all EV3, EV4, EV4 Fastback, EV5, EV6, EV9, and PV5 Passenger grades and variants.
On Friday, the EV4 and PV5 Passenger became the brand’s first vehicle eligible for the UK’s Electric Car Grant. Buyers can now earn £1,500 ($2,000) off the on-the-road purchase price for the EV4 Air and PV5 Passenger Essential and Plus trims.
Although not exactly a promotion, Kia launched the EV4 as Canada’s most affordable EV this week. Starting at under $40,000, Kia’s electric sedan (fastback) is even cheaper than the tiny Fiat 500e.
For those in the US, don’t worry, Kia is offering some pretty great year-end deals, including over $10,000 in savings across its entire EV lineup.
The 2025 Kia EV6 and Niro EV are available with up to $11,000 in customer cash, while the larger EV9 is listed with $10,500 in customer cash.
If you’re looking to finance, Kia is offering 0% APR for up to 72 months, plus $3,500 APR Bonus Cash on the EV6 and Niro EV. The three-row Kia EV9 is available with 0% APR for up to 60 months and a $3,000 APR Bonus Cash offer. In the US, Kia’s “New Traditions” sales event runs until January 2, 2026.
Kia’s deals are generous, but its sister company, Hyundai, may have it beat. You can lease a Hyundai IONIQ 5 right now for as low as $189 per month. That’s about as cheap as EV leases get right now.
If you’re wondering what deals are available in your area, you can find local offers using the links below.
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