Proterra's Onyx battery platform will soon be available with a U.S. cell option, with shipments beginning in Q1 2027. The move reflects the company's commitment to American manufacturing and helps position partners for supply chain resilience and regulatory compliance.

This update also increases domestic content sourcing to support evolving customer, regulatory, and end-market requirements.

“The market is asking for greater supply chain certainty and stronger domestic content. We’re answering," said Chris Bailey, CEO, Proterra. "This investment ensures we can deliver both while continuing to lead in performance and safety.” 

Proterra’s decision to expand the Onyx platform to include a U.S. cell option addresses growing OEM demand for battery solutions with stronger domestic content and supply assurance. As procurement requirements, customer preferences, and regulatory frameworks evolve, Proterra is strengthening a U.S.-anchored supply chain through investments like the U.S. cell option and other strategic sourcing initiatives.

According to the announcement, Proterra is investing in onshore and nearshore critical battery pack and module components, as well as other major internal subsystems. This strategy is designed to reduce disruption risk, diversify geographic dependency, and support scalable production, delivering supply continuity, greater cost stability, and long-term reliability for OEM partners and their customers.

Taking orders now, with availability in Q1 2027, Proterra’s broader onshoring effort, anchored by U.S. cell, will increase American content by over 600%. This significant milestone builds directly on the company’s U.S. footprint, including its technology center in Burlingame, California, and battery manufacturing facility in Greer, South Carolina.

The move aligns with Buy America and Build America, Buy America (BABA) requirements.

Check out our interview with Proterra from this year's ACT Expo:

Proterra’s Onyx modular battery platform is used by heavy-duty equipment OEMs, offering high energy density, durability, and an advanced safety architecture. Its batteries are used in Thomas Built Buses' Jouley and Wattson.