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Marc Tarpenning
Cofounder, Tesla

Tesla Co-founder, Marc Tarpenning

📅 Sep 09, 2025 MCJ 56 MIN 215 VIEWS 131 SEGMENTS · 4 SPEAKERS
Marc Tarpenning (  / marctarpenning  ) is Co-founder of Tesla and a venture partner at Spero Ventures (https://spero.vc/) . In 2003, Marc and Martin Eberhard saw two signals: GM killed its beloved EV1, and Californians snapped up Toyota’s Prius despite its compromises. They realized the market was ready for an electric car that was better than gas, not worse. Their breakthrough: 7,000 off-the-shelf laptop batteries powering a sports car that outran a Porsche and drove over 200 miles. The Tesla Roadster was born, before Elon Musk joined the company. Marc shares how his time in Saudi Arabia e...

Questions asked in this interview

12
  1. 2:34It was your prior business, but what did that feel like? What did that look like?
  2. 4:21And then how did the entrepreneurial pursuits come out of that?
  3. 6:34What brought you to that place in life?
  4. 8:49And you'd known one of the founders, Forest North, since I think the early days of Tesla. Is that right?
  5. 12:57So did you start with the problem you wanted to solve or did you start with the technology insight and say oh I think I see how this could be used differently?
  6. 15:15Any lessons that you took away from what happened to Nuvo Media after you sold it that have helped inform further entrepreneurial efforts on your end?
  7. 17:27And that led you to start brainstorming where did the EV problem come from?
  8. 19:55Did you have friends who had an EV1?
  9. 21:31Is there a blend of these things that got you decided to go work on this?
  10. 24:29Can you talk through the early battery math that you did and what you actually built the product with?
  11. 28:38You self-funded the first few years though, didn't you?
  12. 31:21How did you decide to go to this high-end initial product?
Cody Sims 0:00 ↗
Today on Inevitable, our guest is Marc Tarpenning, co-founder of Tesla and venture partner at Sparrow Ventures. Marc co-founded Tesla in 2003 with Martin Eberhard after observing two things. GM had just recalled and destroyed all of their EV1 electric cars despite loyal customers fighting to keep them, and wealthy Californians were buying Toyota's first hybrid Prius in droves despite it being basic and frankly pretty ugly, just to reduce oil consumption. Marc and Martin realized there was a market for an electric car that wasn't a compromise. One that was actually faster, more fun to drive, and ultimately better than gas cars. Their key insight was using 7,000 off-the-shelf laptop batteries to build a sports car that could accelerate faster than a Porsche while delivering over 200 miles of range. As we all now know, this led to the launch of the Tesla Roadster. And the rest is history. And what some may not know is that this was all before Elon Musk joined Tesla as CEO. Marc's path to Tesla was shaped by unexpected experiences. Years working in Saudi Arabia early in his career gave him a front row seat to America's oil dependence. And his first startup, Nuvo Media, taught him that lithium-ion batteries were improving exponentially. After leaving Tesla in 2008, just as the first Roadsters shipped, Marc spent the next decade serving on his local school board, focusing on his community. Now at Sparrow Ventures, he's investing in founders building sustainable solutions that are economically compelling in addition to being environmentally beneficial. Marc and I talk about his pattern of spotting breakthrough technologies just as they become viable, how bringing a software mindset to automotive let them iterate faster than traditional automakers, and why he believes EVs have already won. From MCJ, I'm Cody Sims, and this is Inevitable. Climate change is inevitable. It's already here. But so are the solutions shaping our future. Join us every week to learn from experts and entrepreneurs about the transition of energy and industry.
Marc, welcome to the show.
Marc Tarpenning 2:32 ↗
It's great to be here.
Cody Sims 2:34 ↗
All right, I'm going to jump in with a question that I can guarantee you you're not expecting because I was doing some reading about the early days of you meeting the person who would become your co-founder at Tesla, Martin Eberhard. And what I saw was you guys really bonded in the early days by playing Magic: The Gathering. And as a fellow late 90s Magic: The Gathering nerd, I wanted to start the conversation there and hear what those late night sessions were like and how in the world you guys decided to become co-founders together. And I know it wasn't over Tesla originally. It was your prior business, but what did that feel like? What did that look like? Share some of those moments.
Marc Tarpenning 3:10 ↗
Wow. I was not expecting that. So Martin and I met because my high school buddy and actually college roommate worked for him at a company. And then as we were meeting socially, we ended up getting into this Magic: The Gathering game, which turned out to be really crazy because for those not familiar with the game, it's one of these games where it's a card game where you build your own deck, but then the rules change constantly because the cards that you play change the rules of the game. So, you're always trying to change the rules obviously for your benefit and against the other players. And it just has a lot of funny strategy to it. And of course, it's brilliantly designed to want you to buy as many cards as you possibly can. So, we would be up late with a bunch of us. It wasn't just Martin and I. It was four or five of us playing this crazy card game. And then a week later, we'd be back at it. But, of course, everyone had gone out and tried to get different cards in the interim and had reshuffled their deck. And it was fun.
Cody Sims 4:02 ↗
I think of it as almost like chess with comic book characters or anime-like characters and then this throughput of energy resource constraints, which is a cool way. It's a beautiful game design.
Marc Tarpenning 4:14 ↗
That's a funny thing because you're always resource constrained in that game. The energy is constrained as well as the number of actions you can take is constrained.
Cody Sims 4:21 ↗
And then how did the entrepreneurial pursuits come out of that?
Marc Tarpenning 4:24 ↗
Well, I had always been fairly entrepreneurial growing up at a time when computers were not that common. So if you were a total electronics computer head when I was a teenager, I knew everybody who had a computer in Sacramento, which had like half a million people. And when a lot of my dad's business associates would come and say, 'Oh, can you come over and fix this or could you explain to my admin how a computer works, what you're supposed to be doing?' So, I was doing all this consulting as a 14-year-old. So, it felt very natural to not end up working for a big company. And then my first job out of college was working for a giant company, but that was not intentional at all. I actually was not looking for a job at all. And I got tracked down.
Cody Sims 5:04 ↗
That's not what most college grads say. I wasn't looking for a job and oh, I accidentally got one.
Marc Tarpenning 5:10 ↗
While I was in college, I was doing a bunch of consulting. Basically, I was working part-time for these various companies and charging at the time a lot for it. So, when I finished college, I was so burned out graduating and working. And so, I went to Europe with some friends and unlike everybody else, I did not have a plan after that. I thought I'm just going to hang out in Europe for as long as possible. But then when I checked in with my parents because it was at a time when there weren't cell phones or anything. So you actually called places and not people. It was kind of a weird time. Hard to imagine now. But anyway, so I called my parents just to check in. And they said, 'Hey, this guy has been calling every day. You got to call him back.' And then he bribed me to come home and start working on a project which is the project that I ended up going to Saudi Arabia on.
Cody Sims 5:52 ↗
Tell more about that. You spent some time early in your career in Saudi Arabia. What was the experience there?
Marc Tarpenning 5:58 ↗
Yeah. Well, I happened to have been an expert in an obscure computer language, weirdly, and they really needed that. There was a project in Riyadh in the capital that was hugely behind schedule and hugely overbudget and a complete disaster. Textron is a company, it's a giant multinational, had a group of misfits that fixed these things, that didn't like process and didn't like stuff that got in their way, and they deployed them on projects that were messed up. They recruited me to come and be one of the misfits and fix this project which was supposed to take I think they said just three months and I was there for six years.
Cody Sims 6:34 ↗
And I'm going to skip around a bit and I want to come back to that because I do want to talk about then how you jumped into being a founder and an entrepreneur but let's bring it to today and help people understand the work you're doing now and I want to talk about a common co-investment that we have together in a company called Telo. We're gonna get all into the Tesla story with you and everything, but feels like quite a full circle moment. 20 years after you guys created the Roadster, here you are investing in another crazy EV automotive startup. What brought you to that place in life?
Marc Tarpenning 7:05 ↗
Well, that's a really good question. I see a lot of EV startups and there have been quite a few since Tesla. Motivated largely because of Tesla's success, I think. And Telo was the first one that to me made a lot of sense. Part of it is that it is easier to start a company. Well, I think it's easier to start a company in general now, but even something as complicated as a hardware company that's doing real hardware, you know, like cars and stuff, it's better because you get to focus on only the things that matter. We had to invent so many things at Tesla that we just didn't care about at all. Electric air conditioning and electric power steering, we had to invent that because it didn't exist. And now all that stuff is off the shelf. And that is awesome, which makes it so that you can develop really interesting niche products that don't have to sell millions of units in order to recover your capital costs. So I think it's a really exciting time in the automotive industry in general because you can have really interesting cars again that for a long period you couldn't make anything if it didn't sell a million a year.
Cody Sims 8:06 ↗
For folks who aren't familiar maybe describe Telo. I mean I could do it but I'm going to hear from you. So describe Telo and what got you excited about it in particular?
Marc Tarpenning 8:13 ↗
So Telo makes and you got to go to the website. They have some great videos and stuff of their vehicles. They make a very compact pickup truck basically that's quite cleverly designed so it can become a pickup truck and haul a whole pickup truck full of stuff or you can fold a couple of things and now it's a four-passenger little car. The great thing is it's the size of a Mini so it really is compact. It really does fit into parking spaces in the city for example which turns out to be a big deal. And it's electric, quick, and it has great range and all the stuff that a modern EV you'd expect and I think it's quite a compelling vehicle.
Cody Sims 8:49 ↗
And you'd known one of the founders, Forest North, since I think the early days of Tesla. Is that right?
Marc Tarpenning 8:55 ↗
Oh, yeah. We hired him in the first year probably at Tesla and then he was with us for a year or two, I think.
Cody Sims 9:00 ↗
I've heard you talk about how you like to invest in things that are building more of a Star Trek future than a Blade Runner future. Can you unpack that a little bit?
Marc Tarpenning 9:09 ↗
Well, you really had to dig for that quote. Well, think about Blade Runner. A couple of things I really liked about Blade Runner, but largely it was a place you didn't want to live. And as entrepreneurs, we actually create the future. When you're building a new product, by definition, you're creating something that doesn't exist because otherwise you wouldn't build it. So, you're building that future. And I want to be involved in companies that are building a future that we all want to live in. And the Blade Runner thing, I mean, the flying cars would be cool, but other than that, it was a grim movie. So, the idea of the Star Trek future where you have resource abundance, where everyone is treated well, and there's lots of interesting stuff to go do, that's the future that I want to create.
Cody Sims 9:48 ↗
Well, you've had your part in doing it quite a bit. And so, let's maybe now take ourselves back in time. You were in Saudi Arabia playing Magic: The Gathering with this guy Martin. I don't know if your Magic games were in Saudi Arabia or whatnot, but...
Marc Tarpenning 10:02 ↗
That was after Saudi Arabia.
Cody Sims 10:04 ↗
Okay. Okay. I assume it's all around the same amount of time. And you had this vision for a company that basically, as I understand, it was the Kindle 15 years or something before the Kindle was invented. Unpack how you got there. I mean, that was like seeing a vision of what reading and books and everything might look like in the future and executing on it for quite a good outcome for yourselves, even if ultimately the company didn't realize itself into what Amazon ultimately built.
Marc Tarpenning 10:29 ↗
That's an interesting thing. So I was in Saudi forever and then came back to Silicon Valley and was looking for something to do and as one does you go to a bunch of parties and actually the very first party I went to I got offered a job to do disc drives which I knew nothing about but they actually turned out to be super cool because they had a mechanical aspect and an analog aspect and a magnetics aspect and then their firmware which is my specialty and have all kinds of power requirements and power saving. There's a lot going on in them. So, I started doing that and the first one was so much fun and the second one was and I love factories and I'm in the clean room looking at a drive or whatever and trying to figure out what's going on with the factory process. Really neat. After the third one and I got really good at them and I was just freelancing so I had all these offers to go and do the next one, the next one, the next one. They're all the same. And actually Martin and I both went to something called DisCon, which is the big hard disk conference. And it was so dull that I thought I was just going to collapse right there. And as we're walking out, I mean, we're literally saved by an espresso cart that was there. Oh my god, we're not going to make it. And then it was an espresso cart. So we walk out and we said, we just can't do another one of these. This is the end. And we started looking for what to do next. And we looked at technologies that were just emerging. So things that were just barely good enough but were continuously getting better. So we knew that if we could make a product that was compelling now that the tailwind would be with us that every year it'd be easier and if we waited too long if it was easy then everyone would be doing it and we wouldn't have any advantage. So we looked at a bunch of different things and one of those was we had seen what we'd heard of display technology and it's ridiculous now to think about but at the time flat panel displays didn't really exist. There was no color flat panel displays. And the ones that were black and white had such poor contrast ratios that if you rendered anything with any detail, you couldn't read it very well. I mean, you would never want to read a book that way. But we had heard that there were some new technologies coming out that were better. So, as an experiment, we went to Japan, which had all the best displays, and we looked around and got intros to every display manufacturer and found one that was good enough, just good enough. And it was actually at the time remarkably beautiful and we knew this is the beginning of having displays that actually are usable for reading. So we figured we'd make an electronic book that you could store many many books in because we traveled a lot. So that was the impetus.
Cody Sims 12:57 ↗
So actually just to understand that. So did you start with the problem you wanted to solve or did you start with the technology insight and say oh I think I see how this could be used differently?
Marc Tarpenning 13:05 ↗
So we had a variety of different fun product ideas, but we wanted to find one where the technology was going to enable it. And so electronic books was one of them. So we had the defining thing there or the critical path is a display that's good enough. So we had to go do that. From the disc drive industry, we knew that something remarkable was happening and that the disc drives were getting fast enough that the data going onto the head and coming off the head was fast enough to keep up with this new MPEG thing for video. So, it'd be possible to actually record video onto a hard drive, which again, this all sounds ridiculous, but in the 1990s, that was really technically not possible, but from the hard drives, we knew it was just now possible. The very cutting edge drives were fast enough. Consumer drives, I mean, the supercomputers could always do it. And so, we looked at making digital video recorders, but neither of us had TVs, and we thought it's funny to do that, and we don't watch TV, so it doesn't seem to work. We looked at multiplayer video games because the internet is all dialup modems, but there was some little bit of broadband. We thought, 'Oh, maybe if we could make something work with multiplayer games, if we could get the latency down, then as that improved, as our connectivity improved.' So, we looked at all kinds of different things, but the one we settled on was this display. We saw the display was just like, 'Oh my gosh, this is going to change everything.'
Cody Sims 14:20 ↗
And so, you decided to go after now the category of ebooks, but that was not a category. That was a thing you guys were inventing. And the company was Nuvo Media. You ultimately you built it for a few years and then had a sizable exit.
Marc Tarpenning 14:34 ↗
Yeah, the exit was great. Yeah. So it turned out we were selling books. We had done all the deals with the publishers which was part of the fun. We wanted to go to New York and meet publishers and authors and that was part of the game. That was all great fun. And then out of the blue, totally out of the blue actually, an acquisition offer came from Gemstar TV Guide, which at the time was the largest publisher really in the world because of TV Guide, which we didn't believe the offer at the beginning. And then as we got to know them, we understood what their plan was and thought, 'Oh, okay, that's actually not crazy.' And they acquired us in 2000, which was convenient because the dot-com bubble was just about to burst.
Cody Sims 15:11 ↗
Oh my gosh. Quite good timing for you.
Marc Tarpenning 15:13 ↗
It worked out. Yeah.
Cody Sims 15:15 ↗
And I wonder any lessons you've learned from obviously at that point they acquired it. There was a market correction that was significant, but they also didn't necessarily have a lot of the infrastructure around them that Amazon later did have when it went to commercialize Kindle. Any lessons that you took away from what happened to Nuvo Media after you sold it that have helped inform further entrepreneurial efforts on your end?
Marc Tarpenning 15:39 ↗
It was a funny thing though. I mean, Gemstar TV Guide at the time was run by this crazy but very interesting character named Henry Yuen, who had just exactly the same number of shares as the other shareholder, which was Rupert Murdoch. Except Rupert actually didn't have as many shares, but he did this incredibly tricky deal after our acquisition and took control of Gemstar TV Guide by having one extra voting share than Henry.
Cody Sims 16:03 ↗
Sounds like the plotline of Succession.
Marc Tarpenning 16:05 ↗
It was really crazy. And Rupert ultimately killed all the digital publishing and ebook projects at the time. And he quite famously said on a newscast at the time, he says, 'No one will ever read on a screen.' So he kills the project. And then what was great was about 10 or 15 years later, somebody sent me a news clip of him being asked about that specifically because he went on to say how newspapers were going to be the dominant form forever because they're so cheap to make and they're so easy. And he's a newspaper guy. And they asked him about that exact quote and he said, 'Yeah, that was a mistake. I missed it. I shouldn't have killed all those things.' I thought, 'Oh my gosh, that was great.'
Cody Sims 16:38 ↗
Listen to your engineers, people.
Marc Tarpenning 16:40 ↗
Yeah. But, you know, once you sold the company, they bought it fair and square and they can do whatever they want with it. So, you can't look back. And that freed us up to go do other things.
Cody Sims 16:48 ↗
Well, and another big thing you did do, you spent a few years between that exit and co-founding of Tesla. What were you spending your time doing?
Marc Tarpenning 16:56 ↗
Oh, actually, I was working for an internet plumbing company. It was called Packet Design and it was doing deep router stuff. Judy Estrin, who was the CTO of Cisco, a friend of mine, had started it right in 2000, right as the world was falling apart. And she said, 'You got to come over and help me out here.' And it was great fun. And I learned all about how the internet actually works and how the plumbing works, which I didn't know about. Super great people, interesting place, but bad timing in terms of an internet plumbing company during the catastrophe. So, they ultimately didn't do very well.
Cody Sims 17:27 ↗
And that led you to start brainstorming where did the EV problem come from? I was trying to do a little bit of history myself and like I remember the movie Who Killed the Electric Car, but I think that was way after Tesla was founded.
Marc Tarpenning 17:40 ↗
Yes, it was. There's an interesting story about that. So anyway, at 2002ish, the internet plumbing thing, my attention span's not very long. So internet plumbing, deep dive, got really into that and then it's like, wow, I understand how all this works. We have these products. It's a difficult market. Anyway, so by this time ready to go do something else, something new and Martin at that point resurfaces and we're trying to think of what to do next. And he was really interested in electric cars, but then there weren't any. The EV1 got crushed. Literally, they all got crushed.
Cody Sims 18:08 ↗
That was the GM attempt, which I think they lobbied California to overturn some clean air laws and all of a sudden there was no regulatory market to support it.
Marc Tarpenning 18:18 ↗
Yeah. And they only leased their vehicles and all of them were in California.
Cody Sims 18:22 ↗
Plotline of a great documentary, Who Killed the Electric Car? For anyone listening who hasn't seen that movie, it was from 2006 or something, right around the same time as An Inconvenient Truth came out. It's a great film.
Marc Tarpenning 18:33 ↗
And it's an example of as a company what you should never do because GM for the first time in their recent history at least was selling into the very most economically advantaged people in California and only was available in California and it was only rich people who leased these things even though they weren't particularly expensive leases but it was only rich people who really wanted them for whatever reason and so when they canceled the leases when they got the laws rewritten so they could kill the thing and they got rid of all the electric cars they canceled the leases and crushed them. And many of these people sued and they put their lawyers from Wilson Sonsini or whatever trying to keep their leases, but GM said, 'Absolutely not. If you read the fine print, we can cancel any time and crush your car.' Just as an entrepreneur, if you're selling something that your customers love so much that they're willing to spend thousands of dollars of their own money on lawyers to try to prevent you from taking it away, to take that away and crush it in front of them, they're never going to forgive you. You're never going to sell another car to them or another product. I mean, only GM would think that was a good idea. So, Toyota had exactly the same deal, and they did exactly the same thing, and they were the only other company that made decent electric cars. When their customers went and said, 'Oh my gosh, we love these things.' They said, 'Oh, okay. Well, you can just buy out the lease. We weren't planning on that, but everyone seems to love these cars, so you can buy out the lease, and we'll come up with a deal that allows it to be serviced because we want to keep all our customers happy.'
Cody Sims 19:55 ↗
So, you were involved in like seeing this happen in real time. Did you have friends who had an EV1?
Marc Tarpenning 19:59 ↗
Oh, yeah.
Cody Sims 20:00 ↗
Okay. So, you were living their drama as they were navigating this.
Marc Tarpenning 20:04 ↗
Many of our early customers told us these stories of throwing the bodies of their lawyers down trying to prevent their cars being taken because the first question that we would get asked is, 'Do we own this car or is it going to be leased?'
Cody Sims 20:16 ↗
Well, this is after you started Tesla, but I'm saying before you even had the nugget of insight, did this happening in real time inform you that, oh, there might be a market here for us to do this thing?
Marc Tarpenning 20:25 ↗
Exactly. That was very inspiring. About the same time the Prius had launched in California and it was only in California and they were losing money on every Prius and it immediately began to eat into Lexus sales and the Prius was on their Echo platform which is Toyota's very very cheapest platform and they didn't expect it to be eating their Lexus sales.
Cody Sims 20:44 ↗
And those first Priuses were really ugly here.
Marc Tarpenning 20:46 ↗
They were ugly. They were super bare bones. But Toyota, when they saw the demographic of who was buying them, as soon as they could retool, and it takes them a little while, but I mean, as soon as they could retool, the next model year, maybe the model year after that, had all these luxury upgrades that you could buy because they understood. And it wasn't because people were trying to save money. I mean, because gas was free. It was like a buck a gallon or whatever. People were doing that because they wanted to reduce their oil consumption for whatever reason, whether it was for geopolitical things, national security, environment, whatever. And we thought between the Prius people and our experience with the EV1, there is a market for something that would be high performance and nice and electric and people would buy it. That was our premise.
Cody Sims 21:31 ↗
How much for you was it? And it's probably a blend of all of these, but techno-environmentalism of like, hey, we can be hackers and build this electric thing that these big companies have just decided to kill and walk away from. How much of it was purely market cold-hearted capitalist? I see people want to buy these things and no one's making it for them. And how much of it was just your own engineering itch to scratch or some other factor? Is there a blend of these things that got you decided to go work on this?
Marc Tarpenning 21:58 ↗
If it had just been like, oh, we're going to make gasoline-powered sports cars or whatever, we would never have done that. So, I was concerned at that time we were importing nearly all of our oil and having been in the Middle East for so long, that's just not a good place. There's lots of interesting things in the Middle East.
Cody Sims 22:13 ↗
Interesting. So truly informed by your on-the-ground experience in Saudi.
Marc Tarpenning 22:18 ↗
I wanted to reduce our oil consumption purely from economics and national security. Just I thought it was wrong for the US to be consuming so much oil. And then I've always been a radical environmentalist. So oil is a disaster on so many different dimensions at the same time that to be able to do something to change that would be amazing. So when Martin was saying, hey, you know what about electric cars? Which I thought was insane initially as a business, that's when we really began to dig in as to is there a market for it? Because if you want to actually make something that moves the needle, it's got to be better. It's got to be compelling in some dimension that people were willing to buy. Because if it's just good for the planet, well, that's great. Except people might buy one or two, but cars, they might buy one, but after a while, they're going to get tired of just being good for the planet and fail. You want to make a product that actually is compelling that people want. And by the way, is better for the planet in some dimension. So we really with electric cars, it was so clearly a win for energy. So much more energy efficient just in general. It obviously can be completely carbon neutral, which is huge. It solves the whole national security problem at the time before fracking changed the equation. And it's super fun to drive. I mean, they're just way more fun to drive. And they're more convenient and they don't break down. And all those dimensions are so much better. And I thought, well, this is super exciting. And the batteries again were just barely good enough, but they were getting better all the time.
Cody Sims 23:41 ↗
Climate change emissions wasn't super topical then yet. So this was more just oil is bad. We see oil spilled, Exxon Valdez, etc. We see the environmental disaster of oil more so than emissions and weather patterns and all of that.
Marc Tarpenning 23:55 ↗
It was just beginning. The data was coming in that it was looking like climate change was really happening and that the CO2 concentrations were problematic. But you're right, in 2003 this was not settled science yet. But there was enough indications that it was like, well, because the consequences of getting this wrong are so high, rational people should reduce the amount of CO2, their lifestyle CO2 should be reduced because this looks like it might really be a problem. And if it is, by the time we figure out whether it really really is, the train will have way left the station. You're not going to be able to change the trajectory very much.
Cody Sims 24:29 ↗
You said batteries were just good enough and I think you guys had a real insight that led to how you developed the initial batteries for the Tesla Roadster. Can you talk through the early battery math that you did and what you actually built the product with?
Marc Tarpenning 24:46 ↗
So Martin and I coming from consumer electronics from our ebook days, we had seen batteries get better. Every generation of battery was better than the previous one. Was cheaper, lighter, more energy, whatever the metric was, it was always better. So, lithium-ion had just come out. They were still really finicky. I mean, they're still kind of finicky, but they were really finicky then. And actually, our very last ebook that we produced, the last model, had lithium-ion cells. And we're like, 'Wow, these are a lot better than the nickel metal hydrides that had preceded them.' So, if you do the math with the best cells that you could buy, which were these things that are called 18650s at the time, and those were like fat double-A's and every year they get cheaper and better. Martin just said, 'Well, what if we bought a whole bunch of those?' And I said, 'Well, this is insane. It's going to take thousands of them.' And the manufacturing dealing with thousands of those things is going to be a nightmare. But it turned out actually that was the best deal because we couldn't afford a billion dollar plant to build different cells. And by the way, there wasn't yet a CATL or BYD making these cells to order. Nobody. Sony invented lithium cells. Sony made some and Panasonic and Samsung and few other Sanyo, maybe a few other players, but very few. But 18650 was the one thing they all made. So the great part is that there was competition. So that had the best price performance ratio of any of them. And when you added that up, it's about 7,000 cells for a Roadster.
Cody Sims 26:03 ↗
Just to be clear, these were just consumer electronics. These were not custom made for any vehicles or anything like that.
Marc Tarpenning 26:09 ↗
Exactly. At the time they were in every laptop because laptops were big at the time. They were in camcorders. That's a thing before there were cell phones and stuff. There were these camcorder things. And so everybody had a few cells. So when we just with the spreadsheet said, 'Well, what kind of car could we make? What range could it have? How heavy would it be? How many cells would it take?' Which dictated the cost. And that turned out to be we could just make a compelling car. We could make something like a Roadster that had incredible acceleration, which was a metric that people pay for. So, it was great. It would be quicker than an internal combustion engine car for the price by far. And every year the cells get better and cheaper. So, the major cost component of our product got better and cheaper without us having to do anything every year and had been getting better and cheaper for 30 years. So, there was an enormous history of getting better and cheaper. So, we figured if we can make the economics work with the existing cells, by the time we're in production, the economics will even be better. And as we grow, the tailwind will even be greater. And maybe if we grow big enough, we can influence the direction of those cells in a way that would really be beneficial for electric cars.
Cody Sims 27:14 ↗
So, it sounds like you had some techno-economic analysis that the math could work to at least build one of these things or a few of them and that they would actually work and you could manufacture them.
Marc Tarpenning 27:26 ↗
Well, a few thousand.

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Tarpenning, M. (2025, September 9). Tesla Co-founder, Marc Tarpenning [Interview transcript]. MCJ. CEOInterviews.AI. https://ceointerviews.ai/interview/651699/

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Marc Tarpenning. "Tesla Co-founder, Marc Tarpenning." MCJ, 9 Sep. 2025. Transcript, CEOInterviews.AI, https://ceointerviews.ai/interview/651699/.

BibTeX
@misc{tarpenning2025_651699,
  author       = {Marc Tarpenning},
  title        = {Tesla Co-founder, Marc Tarpenning},
  howpublished = {Interview transcript, MCJ. CEOInterviews.AI},
  year         = {2025},
  month        = {sep},
  url          = {https://ceointerviews.ai/interview/651699/},
  note         = {Speaker-attributed transcript with timestamps}
}