Emissions Reduction Projections

According to the Argonne National Laboratory’s GREET 1.8 fleet carbon footprint calculator, which calculates greenhouse gas emissions for vehicles, the amount of emissions eliminated using the ZEPS drive powered bus was determined. The table below, using the California Grid Energy source mix for calculations of emissions, compares emissions using different fuels and assumes 50,000 miles driven per year. The emissions for hydrogen fuel cell and electric bus are calculated using emissions caused by the generation of electricity used to generate hydrogen or charge the battery packs.

Bus Type GHG emission (Short ton)/Year
Diesel 140.5
CNG 122.9
Diesel Hybrid 97
Hydrogen Fuel Cell 85
ZEPS All Electric 71
ZEPS Charged With Renewables 0

From the comparison table, it is evident that our all-electric transit bus provides a significant emission reduction. An all-electric bus coupled with 100% renewable energy generation can eliminate greenhouse gas emissions by 140 short tons per bus per year.

Fuel Cost Savings

Apart from the reduction in greenhouse gas emissions, an all-electric transit bus will also significantly reduce fuel costs. Using the EPA’s MPG equivalent formula for electric vehicles, it is estimated that the ZEPS bus will provide MPG equivalent of 21.2, which is four times more efficient than conventional diesel buses. More efficient buses will result in lower fuel and maintenance costs. Overall lifecycle cost calculations show that the ZEPS bus will save more than $340,000 in comparison to a diesel bus.


Maintenance Cost Saving

The annual maintenance cost savings were estimated by using several published reports by transit authorities. The cost of maintenance of the ZEPS bus will be almost one-fifth of the diesel powered bus. An all-electric bus will significantly improve the vehicle reliability, helping transit agencies to minimize the downtime between failures and improve service to communities.

Eliminating Waste Disposal

As the ZEPS bus does not require engine oil, transmission fluid, antifreeze, diesel particulate filters, urea injection, emission control equipment, oil filters, fuel filters and transmission filters, the cost of procuring such components and the environmental damage caused by disposal is eliminated. Recycling of the bus chassis also conserves valuable metal resources. A single ZEPS bus will conserve more than 10,000 pounds of ferrous metals. The activities related to mining, extraction and shipping of metals adds significant quantity of greenhouse gas emissions. By utilizing retired bus chassis, CCW is providing excellent value to its customers and also providing lowest total life cycle carbon emissions for a transit bus.

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