Miami-Dade and Broward counties bought roughly 100 Proterra electric buses with about $96 million in public funds (Miami-Dade: 69 buses for $61.8 million; Broward: 31 buses at ~$1.1 million each).

Most are now sidelined—over a year after being pulled from routes due to repeated breakdowns.

Dozens sit idle at Homestead Air Reserve Base; others are stored in a remote section of a Broward County landfill.

Proterra was once hailed as a leader in electric bus tech.

Miami-Dade’s mayor even unveiled the fleet in 2023 as “the future of public transit.”

But the buses started failing frequently—breaking down mid-route, requiring tows, and suffering battery and mechanical issues.

Broward reported failures roughly every 600 miles, far worse than their diesel fleet.

Parts became scarce or unavailable after Proterra’s Chapter 11 bankruptcy (its assets were later sold, but support and warranties have not recovered).

Proterra Inc., a prominent U.S. manufacturer of electric transit buses, battery systems (Proterra Powered), and charging infrastructure (Proterra Energy), filed for Chapter 11 bankruptcy protection on August 7, 2023, in the U.S. Bankruptcy Court for the District of Delaware (Case No. 23-11120).

The company listed assets and liabilities each in the range of $500 million to $1 billion.

At the time of filing, Proterra had delivered over 1,300 electric buses nationwide, including fleets in Miami-Dade and Broward counties in South Florida. CEO Gareth Joyce cited “market and macroeconomic headwinds” that hindered efficient scaling, including supply chain disruptions, inflation, high manufacturing costs, and challenges in simultaneously growing three distinct business lines.

High costs and low margins in bus manufacturing: Electric bus production required significant working capital. Contracts signed 12–18 months earlier became unprofitable due to inflation and rising material/labor costs. The company often lost money on deliveries—e.g., materials alone cost more than revenue in some quarters. Buses were highly customized per transit agency, limiting automation and economies of scale.

Rapid diversification and cash burn: Proterra expanded into battery systems for other EVs and charging solutions while trying to scale bus production. These new lines did not generate enough cash flow to offset losses in the core transit business. A Q1 2023 loss reached $250 million (5x the prior year), prompting layoffs of ~300 staff earlier that year.

Tight capital markets and failed sales attempts: Proterra tried (via bankers like Moelis) to sell the transit bus division or raise new investment, but buyers shied away from the money-losing bus operations. The single corporate structure and debt covenants complicated deals. It had gone public via SPAC in 2021 at a ~$1.6 billion valuation but saw its market value collapse.

Broader EV sector pressures: Supply chain issues, slowing demand in some segments, and competition (including from lower-cost Chinese manufacturers) exacerbated problems. Proterra used nickel-based batteries, which were more expensive than lithium alternatives used by some rivals.

The company continued operations during bankruptcy to fulfill orders and preserve value, while seeking to sell or reorganize business lines separately.

Proterra pursued a multi-track sale process:

Proterra Powered (battery, electric drivetrain, and vehicle electrification business): Sold to Volvo Group (via Volvo Battery Solutions) for ~$210 million plus assumption of certain liabilities. The deal closed in early 2024 after court approval. Assets included a California development center and South Carolina assembly plant.

Proterra Transit (electric bus manufacturing and related assets): Sold to Phoenix Motor Inc. (a smaller EV maker focused on medium-duty trucks and school buses) for ~$10 million plus liabilities. Phoenix completed the acquisition in January 2024. This is the successor entity most relevant to existing Proterra bus fleets.

Proterra Energy (charging infrastructure and software): Retained by the reorganized company under a Chapter 11 plan.

The company emerged from bankruptcy in March 2024 as a reorganized entity (later renamed Prodigy Investments Holdings, Inc., f/k/a Proterra Inc.).

It deleveraged by repaying/equitizing ~$200 million in funded debt, exited with substantial cash and no funded debt, and distributed equity primarily to second-lien noteholders.

Unsecured creditors received meaningful (but partial) recovery. Shareholder objections were overruled.

The bankruptcy directly contributed to the issues in Miami-Dade (69 buses for $61.8 million) and Broward (31 buses) fleets.

Parts became scarce or unavailable, warranties and service support were disrupted, and the new owner (Phoenix) faced questions about its ability to fulfill long-term obligations.

Broward reported buses failing roughly every 600 miles—far more frequently than diesel equivalents. Many buses were pulled from service, leading to the idle/storage situation highlighted in 2026 local reporting.

Transit agencies now face repair challenges, potential federal grant clawbacks (buses must meet service milestones), and decisions on retrofits or disposal.

This case illustrates risks for subsidized EV deployments: heavy reliance on a single vendor, long-term service dependencies, and the fragility of scaling capital-intensive tech amid cost pressures.

Proterra’s battery tech lives on under Volvo, while the bus line continues (in limited form) under Phoenix, but legacy customers like South Florida agencies have borne significant operational and financial fallout.

Proterra developed modular lithium-ion battery systems (branded as TerraVolt early on, later Onyx series under Proterra Powered) primarily for heavy-duty applications like electric transit buses, trucks, and other commercial vehicles.

The technology emphasized high energy density, safety features, active thermal management, and scalability for different vehicle platforms.

After Proterra’s 2023 Chapter 11 filing, the battery business (Proterra Powered) was acquired by Volvo Group in early 2024 for ~$210 million. This included the California development center and South Carolina assembly plant.

Volvo continued operating it as a going concern, supplying select customers and integrating the tech into their electrification roadmap. The bus manufacturing side went to Phoenix Motor Inc., but battery support for legacy fleets (like South Florida’s) faced disruptions during the transition.

In Miami-Dade and Broward deployments, Proterra buses (often with high-capacity NMC packs) experienced notable reliability challenges, including frequent breakdowns (reported ~every 600 miles in Broward vs. ~4,500 for diesels), parts shortages post-bankruptcy, and operational issues.

Factors like Florida’s heat accelerating degradation, high AC loads reducing effective range, and heavy-duty cycling likely contributed—common pain points for early high-nickel NMC packs in transit service.

While NMC offers strong energy density for range, it can be more sensitive to temperature extremes and fast charging compared to LFP alternatives.

These issues compounded the broader subsidized rollout problems, leading to many buses being sidelined.

Proterra’s approach delivered competitive energy density for its era in the U.S. market, enabling longer-range claims than many peers, but highlighted the gap between lab/spec-sheet performance and sustained real-world heavy-duty transit use under varying climates and maintenance realities.

The technology lives on via Volvo, with ongoing refinements in commercial EV battery platforms.

The purchases were heavily subsidized by federal, state, and local grants tied to zero-emission mandates.

Transit agencies bought the buses to chase the money and hit political targets rather than strictly on proven lifecycle cost or reliability.

When the tech under-delivers and the vendor fails, riders get fewer buses on the road, and taxpayers foot the bill for idle assets (plus any diesel backups needed to fill gaps).

Either way, South Florida’s experience is a stark, visible reminder: $96 million bought a fleet that mostly isn’t moving anyone.

Local officials are now scrambling for repairs, retrofits, grant forgiveness, or disposal—while the buses sit as expensive monuments to good intentions meeting hard engineering limits.