Washington state is set to join Texas in mandating the use of Tesla’s charging plug for electric vehicle (EV) charging companies participating in a state program aimed at electrifying highways using federal funding. The move bolsters Tesla CEO Elon Musk’s ambition to establish Tesla’s North American Charging Standard (NACS) as the national charging technology, despite efforts by the Biden administration to promote the Combined Charging System (CCS) as the dominant standard in the United States. With major automakers such as GM, Ford, and Rivian also embracing Tesla’s NACS, the push for a unified charging standard gains momentum.

Future-Proofing Washington’s Investments

Tonia Buell, the alternative fuels program manager at Washington state’s Department of Transportation, expressed her enthusiasm for the adoption of a single standard, stating, “I’m actually really happy about NACS and how finally automakers are gearing towards one standard. We want to provide access to as many makes and models as possible.” The decision to mandate Tesla’s plug is part of the state’s effort to “future proof” its investments in EV charging infrastructure, ensuring compatibility with the technology likely to be widely embraced by automakers.

Ensuring Compatibility and Reliability

While acknowledging the need for testing and certification of Tesla’s plug for other auto manufacturers, Buell emphasized the state’s intention to require NACS at state-funded and federally-funded charging sites in the future. This cautious approach aims to ensure that the technology is reliable and compatible with a range of EV models, guaranteeing a seamless charging experience for users. By incorporating Tesla’s plug into the charging infrastructure, Washington state aims to accommodate the growing demand for EVs and support the transition to cleaner transportation alternatives.

Requests for Proposals Process

Washington state plans to initiate the requests for proposals (RFP) process in the fall to attract charging companies interested in participating in the state program. This competitive process will allow the state to select charging providers that align with the requirements of including Tesla’s plug in their charging infrastructure. By incorporating this mandate into the RFP process, Washington state demonstrates its commitment to facilitating a standardized and user-friendly charging network for EV owners.

Balancing NACS and CCS Chargers

To comply with current federal requirements, Washington state officials are currently determining the optimal mix of NACS and CCS chargers at taxpayer-backed charging sites. Federal regulations necessitate a minimum of four CCS chargers at each site, and the state may require that at least two of them be compatible with NACS, or potentially mandate all four to be dual-compatible. This approach ensures a fair balance between the two competing charging standards while promoting the wider adoption of NACS.


Washington state’s plan to mandate Tesla’s charging plug for participating charging companies in its highway electrification program represents a significant step towards establishing a unified charging standard in the United States. By embracing Tesla’s NACS, major automakers and state authorities are recognizing the importance of compatibility and accessibility in the rapidly growing EV market. Washington’s decision to future-proof its investments in EV charging infrastructure demonstrates a commitment to accommodating diverse EV models and ensuring a seamless charging experience for all users. As the transition to electric mobility accelerates, a standardized charging network will play a crucial role in driving widespread EV adoption and reducing carbon emissions.