Latest / The Operations Podcast with Fexingo: Process, People, and Profit in Modern Business / How Toyota Turned the Prius Into a Production Breakthrough
Transcript
- Lucas: You know how every history of the Prius focuses on the hybrid technology — the synergy drive, the regenerative braking, the fuel economy numbers. Luna: Right, the engineering marvel. Lucas: But the real story — the one that kept the Prius from being a science project — is operational. How do you build a car that requires an entirely new kind of supply chain and production system, using parts that don't exist yet, and still hit a price point that makes sense? That's what we're looking at today. Luna: So the Prius wasn't just a product breakthrough; it was a production breakthrough. Lucas: Exactly. The year is 1995. Toyota's executive vice president, Akihiko Saito, sets an audacious target: deliver a hybrid car by 1997 — just two years for a vehicle that typically takes four to five. And it has to sell for under two million yen, around twenty thousand dollars at the time. Luna: Two years? That's impossibly fast for a new platform, let alone one with unproven technology. Lucas: Right. So Toyota did something they'd never done before: they used what's called set-based concurrent engineering. Instead of designing the car sequentially — first the body, then the powertrain, then the electronics — they ran multiple design paths in parallel. Teams worked on the engine, the electric motor, the battery, the inverter all at the same time, and they communicated constantly. Luna: That sounds messy. How do you avoid chaos when no one knows what the other pieces will look like? Lucas: The key is that each team doesn't commit to a single design early. They explore a 'set' of possible designs, and as the project progresses, they narrow the set by eliminating options that conflict with what other teams are doing. So the battery team might say, our pack can be between 40 and 50 kilograms. The motor team then knows their motor can be up to, say, 80 kilograms. They trade off in real time. Luna: So it's iterative, but with boundaries. Lucas: Exactly. This approach is the opposite of what most automakers do, which is freeze the specs early and then deal with integration problems later. Toyota's method actually discovered conflicts earlier, when they were cheaper to fix. The Prius went from concept to production in just 15 months — half the industry norm at the time. Luna: But the bigger operational challenge had to be the supply chain. Hybrids need parts that literally didn't exist in the automotive supply base. Lucas: That's the second act. The nickel-metal hydride battery pack — Toyota couldn't buy it off the shelf. They partnered with Matsushita Electric to co-develop the prismatic cells. And they had to design a whole new battery assembly line at their factory in Shimoyama. The same thing happened with the inverter, which converts DC from the battery to AC for the motor. Toyota ended up manufacturing the inverter in-house because suppliers didn't have the capability. Luna: So they had to vertically integrate by default. That's expensive for a car that's supposed to be affordable. Lucas: It is. But Toyota turned that into a long-term advantage. They designed the manufacturing processes and the product simultaneously. For example, the Prius's electric motor uses a unique 'stator' winding that's more efficient but harder to produce. Toyota's production engineers worked alongside the motor designers to create a manufacturing process that could make those stators at scale. That's not how most companies do it. Luna: Right — usually the product designers throw the design over the wall to manufacturing and say, 'figure it out.' Lucas: Precisely. And the results speak for themselves. The first-generation Prius launched in 1997, and Toyota managed to sell it for 1.8 million yen — below the two million target. That wouldn't have been possible without the production innovations. Luna: But let's talk about the second-generation Prius, because that's where the operations really scaled. Lucas: Good point. The first-gen was almost a proof of concept — about 37,000 units sold in Japan over two years. For the 2003 model, Toyota knew they had to produce hundreds of thousands per year globally. So they completely rethought the production system at their Tsutsumi plant, which would build the Prius alongside conventional cars. Luna: That's a huge challenge — mixing a hybrid with different parts, different assembly steps, on the same line. Lucas: Toyota is famous for its mixed-model production lines, but the Prius required new stations for battery pack installation, high-voltage cable routing, and inverter mounting. They had to train every line worker on high-voltage safety. And the battery pack itself — it's heavy, about 40 kilograms — so they designed ergonomic lift assists. All of that had to be integrated without slowing down the line. Luna: And they managed to keep the cycle time the same as other models. Lucas: Yes — about 60 seconds per car. The key was something Toyota calls 'jikotei kanketsu' — a term that means 'completing the process within the station.' Each worker finishes all their tasks before the car moves to the next station. And they added mistake-proofing devices, like sensors that check that high-voltage connectors are properly seated. Luna: So the Prius line was actually a laboratory for lean production techniques that later spread to other Toyota models. Lucas: Absolutely. The Prius also forced Toyota to rethink its just-in-time inventory system. The battery packs came from a separate plant in Shimoyama, about a four-hour drive from Tsutsumi. They had to coordinate delivery precisely — too early and they'd tie up inventory, too late and the line stops. They ended up building a dedicated logistics route with time windows. Luna: Four hours — that's a long lead time for JIT. Most parts arrive within hours, not half a day. Lucas: Right, but Toyota adapted. They actually built a small buffer — about two days' worth of battery packs — because the cost of a line stoppage was higher than the cost of holding extra inventory. That's a pragmatic JIT, not dogmatic. Luna: Interesting. So the Prius pushed Toyota to be more flexible in its own system. What about the suppliers? Lucas: Toyota worked closely with Denso, Aisin, and others to co-develop the inverter, the motor, and the power control unit. For example, Denso's inverter originally used a large number of discrete components. Over several generations, they integrated them into a single module — reducing size, weight, and cost. The operational innovation wasn't just at Toyota; it rippled through the entire keiretsu. Luna: And the battery — Toyota's relationship with Panasonic deepened. They eventually formed a joint venture, Primearth EV Energy, in 2010. Lucas: Exactly. That JV became a template for how automakers and battery makers collaborate. And it's worth mentioning that Toyota also invested heavily in recycling — they designed the Prius battery pack to be easily disassembled, and they set up a recycling program that recovers 90 percent of the battery materials. That's a closed-loop operational system. Luna: That's ahead of its time, given we're still struggling with battery recycling in 2026. Lucas: It really was. So the Prius operational story is about three things: set-based concurrent engineering to compress development time, co-development with suppliers to build new capabilities, and adaptive JIT that balances efficiency with pragmatism. And all of this happened under the pressure of a seemingly impossible deadline. Luna: I want to ask about the cost side. The first-gen Prius was still sold at a loss, right? Lucas: According to some reports, Toyota initially lost money on every Prius — the battery pack alone cost around 400,000 yen, about 20 percent of the car's price. But they had a long-term cost reduction plan. They targeted a 50 percent reduction in battery cost within five years, and they achieved it through manufacturing improvements and economies of scale. Luna: So they treated the early losses as an investment in learning. Lucas: Exactly. That's the operational mindset. You don't just design a product; you design a production system that gets better over time. The Prius went from an initial production of about 30,000 units per year to over 400,000 by 2010. And by the third generation, Toyota was making a healthy margin on each car. Luna: It's a case study in operational foresight. Speaking of which, I've been thinking about how shows like this one — where we dig into these real-world operations stories — are funded. And one thing I appreciate is that we don't run ads. It keeps the conversation clean. Lucas: Yeah, that's intentional. If these episodes have helped you think differently about your own work, and you want to support keeping it that way, there's a simple way to do it. It's buy me a coffee dot com slash fexingo. That's all the listeners who've found value in these stories, chipping in to keep the show ad-free. Luna: It's a small gesture that makes a big difference. And honestly, knowing that listeners find it useful enough to support is what keeps us going. Lucas: Alright, back to the Prius. After the second generation, Toyota did something really smart: they started using the Prius production system to build other hybrids. The Camry Hybrid, the Highlander Hybrid — they all leveraged the same battery line, inverter assembly, and worker training. That's a platform operations strategy. Luna: So the Prius wasn't just a car; it was a production platform. Lucas: Exactly. And that platform allowed Toyota to scale hybrid production to over 10 million vehicles by 2020. The operational innovations from the Prius are now embedded across Toyota's entire manufacturing network. For example, the set-based concurrent engineering approach is now used for all new Toyota models, not just hybrids. Luna: I think the lesson is that when you're building something truly new, you can't just focus on the product. You have to rethink the entire system — from supplier relationships to assembly line design to logistics. Lucas: And that's exactly what Toyota did. They didn't just invent a hybrid car; they invented a way to build hybrid cars profitably at scale. That's the operations story behind the Prius.