The Proterra Powered powertrain manufacturing business line will operate as an independent company within the Volvo Group.

The Proterra Energy business line which built charging systems for fleets of heavy-duty vehicles was purchased by Cowen Equity.

TransTeq was best known for building the fleet of "EcoMark" buses used on the 16th Street Mall in Denver that were series hybrids with batteries charged by a generator connected to a small compressed natural gas fueled engine.

The battery-electric bus had a composite body and range-extending hydrogen fuel cell auxiliary power unit (APU).

[10] In February 2010, Proterra announced that it would move its manufacturing plant from Golden to a location in Greenville, South Carolina just outside of the Clemson University International Center for Automotive Research (CU-ICAR).

[19] Among reasons cited for the bankruptcy were supply chain disruption, leading to penalties for not meeting supplier contract commitments and for subsequent delayed deliveries, as well as the nature of the business of producing highly customized products for each transit agency, and over a period of 12 to 18 months, during which inflation cut into margins.

[3][20][21] In mid-November 2023, in the first of two bankruptcy proceedings, Volvo Group placed a winning $210 million bid for the Proterra Powered business line, which builds batteries and drivetrains for other heavy-duty vehicle builders.

[9] EcoRide was offered only with a lithium-titanate battery chemistry, which enabled fast on-route charging using the company's proprietary charger, but limited range.

[30] In 2018, Proterra discontinued its proprietary overhead "blade" charger in favor of the then standardized SAE J3105 charging options.

[37] Thomas Built Buses announced a partnership with Proterra in October 2018 to build an electric version of the Saf-T-Liner C2 school bus, called the "Jouley.

[39] ENC announced a partnership with Proterra in September 2022 to build an electric version of the Axess transit bus, a direct competitor to the ZX5.

The company has a transit bus assembly facility in Greenville, South Carolina that sits directly outside the Clemson University International Center for Automotive Research (CU-ICAR).

[48][49] SEPTA transit agency discovered defects in the composite chassis of the buses,[48] including cracks that Proterra characterized as "non-structural" in May 2019 and failed equipment brackets in January 2020.

[50] SEPTA's chief vehicle engineering officer Dave Warner also said, "Proterra and its structural consultant … have been uncooperative in the resolution process.

"[50] Proterra's composite frames use a mix of resin, fiberglass, carbon fiber, balsa wood, and steel reinforcement plates, according to a SEPTA report on the cracks.

[50] A similar issue was identified in New York's Tompkins Consolidated Area Transit where the frame on one of their Proterra buses separated from the axle when it was positioned on a lift on March 13, 2024.