40 both a shift to higher power output and, crucially, compatibility with rival EVs. Tesla also established a Supercharger factory in Shanghai adjacent to Gigafactory 3, with an announced annual capacity of 10,000 charging stations demonstrating its ability to localise production in its largest markets. NACS and ecosystem strategy Perhaps the most consequential manufacturing decision Tesla has made is the development and subsequent sharing of NACS. Originally Tesla’s proprietary connector standard, NACS was opened to other manufacturers in November 2022 and is now being standardised as SAE J3400. The connector uses a compact five-pin layout where the same two pins handle both AC and DC charging. Between May and December 2023, Ford, General Motors, Rivian, Volvo and Polestar all announced that their North American EVs would adopt NACS ports starting in 2025. This shift transforms Tesla’s Supercharger manufacturing from a captive operation serving only Tesla owners into a supplier of charging infrastructure for the majority of the North American EV market. Digital intelligence Tesla’s broader manufacturing philosophy is best illustrated by its Shanghai facility. The Shanghai Gigafactory implemented a ‘digital intelligence’ quality management system starting in 2020, which the company credits with enabling rapid scaling of vehicle production while maintaining quality. The system encompasses a proprietary Manufacturing Operating System (MOS) and automatic detection equipment that monitors critical quality during manufacture, with all test data uploaded to the database with full traceability. For chargers, this same philosophy applies. Tesla’s vertically integrated manufacturing model offers a number of advantages. The ability to coordinate Supercharger development with vehicle battery architecture allows Tesla to optimise charging curves, communication protocols and thermal management across the entire system. The opening of NACS and production of V4 Superchargers with third-party compatibility moves Tesla from being a closed ecosystem to something closer to a platform provider. The key trade-off, however, is that while vertical integration gives Tesla control, it also concentrates risk. If Gigafactory New York faces production issues, there is no alternative supplier. Modular local production Kempower represents a third manufacturing archetype characterised by modularity and local supply chains. Kempower has built its production strategy around standardising on 50 kW power modules that can be stacked like building blocks to create chargers of any capacity from 50 to over 600 kW. This modular architecture has profound implications for manufacturing flexibility, capital efficiency and supply chain resilience. The engineering advantages are straightforward: modularity reduces product variants, simplifies inventory management and enables what Kempower calls “staged path deployment.” Charging site operators can launch at 150–200 kW, generate revenue, then add modules as grid capacity becomes available without replacing the entire cabinet. This approach minimises ‘stranded’ assets and accelerates time to value, a practical benefit that flows directly from Kempower’s manufacturing decisions. Kempower operates three factories in Lahti, Finland, which serve as its headquarters and primary production hub, and sources the majority of materials and components from local Finnish partners. This localisation acts as a foundational element of its supply chain resilience and carbon neutrality targets. It supports both quality control and environmental, social and governance objectives, reducing transport emissions and enabling faster reaction times to supply disruptions. The Lahti facilities have also embraced automated internal logistics in the form of an autonomous electric bus to transport power modules between its two main factories in Lahti, starting in January 2024. Supplied by Finnish robotics specialist Remoted, the bus replaced Insight | Fast-charger manufacturing July/August 2026 | E-Mobility Engineering Newly manufactured fast-charger cabinets pictured at ABB’s US plant in Columbia, South Carolina, a facility developed with partner Flex (Image: ABB E-Mobility)
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