Proterra Announces U.S. Cell Supply Option for Onyx Battery Platform

Strategic Investment Strengthens Domestic Supply Chain

GREER, S.C.--(BUSINESS WIRE)--Proterra, the proven electrification partner for heavy-duty transportation and industrial equipment manufacturers, today announced that its industry-leading Onyx battery platform will be available with a U.S. cell option, with shipments beginning in Q1 2027. This update reflects Proterra’s strategic focus and investments to localize and de-risk battery materials and components.

In response to a shifting geopolitical and policy environment, North American OEMs are demanding greater domestic content. Today’s announcement reinforces Proterra’s commitment to American manufacturing and helps position partners for supply chain resilience and regulatory compliance.

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

Performance Without Compromise

Proterra’s Onyx modular battery platform delivers the performance commercial vehicle and heavy-duty equipment OEMs depend on, including high energy density, proven durability, and an advanced safety architecture. This update also increases domestic content sourcing to support evolving customer, regulatory, and end-market requirements.

A More Resilient, U.S.-Anchored Supply Chain

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.

Proterra is investing to 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 end 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 is a significant milestone that builds directly on the company’s U.S. footprint, including our technology center in Burlingame, CA, and battery manufacturing facility in Greer, SC.

This effort further strengthens alignment with domestic content frameworks, including Buy America and Build America, Buy America (BABA) requirements, and positions Proterra’s customers for greater certainty amid an evolving policy landscape.

About Proterra

Proterra is the proven electrification partner for heavy-duty transportation and equipment manufacturers enabling the shift to zero-emission products. By providing innovative battery solutions that perform in the toughest environments, we power our customers to build a safe and sustainable future. Learn more at proterra.com.