Tesla Charging Standard (NACS)

The North American Charging Standard (NACS), originally Tesla's proprietary charging interface technology, was officially rebranded and made globally accessible by Tesla in November 2022 to establish a unified electric vehicle (EV) charging standard across North America. Backed by its compact design, high power output, and the extensive coverage of the Tesla Supercharger network, NACS has emerged as the leading standard in the North American EV charging sector.

Technical Features

At its core, NACS integrates both AC slow charging and DC fast charging into a single port, featuring a connector that is just half the size of a conventional CCS plug. In terms of technical parameters, NACS supports up to 1000V and 900A to 1000A, theoretically delivering up to 1 megawatt (MW) of power—significantly surpassing the 350kW ceiling of the CCS standard. On the AC front, it supports 240V/48A (approx. 11.5kW) single-phase AC charging.

In terms of communication protocols, NACS shares a broadly similar architecture with CCS circuitry, ensuring compatibility with protocols such as ISO 15118 to support Plug & Charge and V2G bidirectional charging capabilities.

Standardisation Process

In November 2022, Tesla rebranded its decade-old proprietary charging specification as "NACS" and opened its patents, inviting all carmakers, charging equipment suppliers, and charge point operators (CPOs) to adopt it. In 2024, SAE International released the SAE J3400 Recommended Practice, formally establishing NACS as the technical standard for North American EV charging systems, adjusting the designation from "Standard" to "System" to emphasize its complete architecture. The J3400/2 update released in 2025 further optimised the hardware to ensure the connector reliably supports 1000V power delivery.

Industry Adoption and Application

NACS has gained widespread traction across North America. According to Tesla's official data, EVs equipped with the NACS standard outnumber CCS-equipped vehicles by nearly two-to-one, while NACS charge points exceed all CCS chargers combined by 60%. As of 2025, over 15 major carmakers have committed to the NACS standard, including Ford, GM, Rivian, Volvo, Mercedes-Benz, Nissan, Honda, Hyundai, Kia, Toyota, BMW, and brands under the Volkswagen Group. The Cadillac Optiq has also become GM’s first production model to come factory-equipped with a native NACS charging port. Major charging network operators like Electrify America and ChargePoint have likewise accelerated the rollout of NACS-compatible connectors.

However, cross-brand interoperability still faces hurdles. Several early-adopting models encountered compatibility issues at Tesla charging stations, while differing charge port locations across brands (rear-left on Teslas versus front-right on certain other models) have also caused issues with short charging cables. EV owners can currently achieve cross-brand charging via native NACS ports, CCS-to-NACS adapters, or dedicated software integrations.

Scope of Application and Limitations

NACS is tailored primarily for the North American market (the US, Canada, and Mexico) and engineered specifically for single-phase AC charging. In regions relying on three-phase AC power such as Europe and China, NACS cannot be directly applied; Tesla continues to utilise CCS2 and Chinese GB/T standards respectively in those markets. While the rollout of NACS has limited impact on other international markets, its success in consolidating the North American market offers a valuable reference for EV charging standardisation globally.