Hybrid Electric Buses

Transportation, especially public transportation, is a key sector contributing to GHG emissions. The need for sustainable and efficient public transportation has led to the advent and advancement of hybrid electric buses in the commercial fleet market. These vehicles combine an internal combustion engine with an electric propulsion system, offering considerable fuel efficiency and lower emissions compared to conventional buses.

Technological Advancements in Hybrid Electric Buses

The technology behind HEBs has undergone significant advancements over the past few years, boosting their fuel efficiency and lowering their GHG emissions. Innovations include:

GHG Emissions Quantified in Terms of GGE

HEBs have been found to significantly reduce GHG emissions compared to traditional diesel buses. It has been estimated that a typical hybrid electric bus emits approximately 30% fewer GHGs than a conventional diesel bus. This amounts to an average of about 7500 GGE per year per bus.

Impact on Sustainability

Hybrid electric buses contribute significantly to sustainability by reducing GHG emissions, noise pollution, and dependence on fossil fuels. They offer better fuel economy and lower maintenance costs compared to their diesel counterparts. Furthermore, HEBs also offer a stepping stone towards fully electric buses, which could provide even greater benefits in the future.

Economic, Environmental, and Social Costs

The adoption of hybrid electric buses involves both benefits and costs:

Forecast of Production Units

Based on current trends and market analysis, it is expected that production of HEBs will continue to increase both in the United States and globally. By 2030, it is estimated that HEBs will make up about 15% of the total bus market in the US and 12% globally, an increase from 5% and 4% respectively in 2023.

The projected increase is attributable to a few factors:


The advancements in hybrid electric bus technology provide promising avenues for reducing GHG emissions and achieving sustainability goals in the public transportation sector. However, despite the evident advantages, the adoption of HEBs is contingent upon addressing the economic, environmental, and social costs associated with these vehicles. With proper policy support, technological advancement, and increased public awareness, it is expected that the production of HEBs will continue to rise, thereby playing a critical role in the transition towards a sustainable and green transportation system.