The Caterpillar Inc. hydraulic hybrid excavator may reduce up to 25 percent of greenhouse gas emissions compared to conventional diesel fuel models.

In partnership with CALSTART, Caterpillar, Inc., is demonstrating an off-road, 36-ton hydraulic hybrid excavator, capable of seamlessly moving raw materials such as dirt and rocks from one location to another.

The hybrid excavator has been used by Teichert, Inc., and Kiewit, two major construction companies in California. It has also been used in the Bay Area and Sacramento Valley areas.

Energy Commission funding helps accelerate commercialization of this technology, helping the technology to become more widely available in a shorter amount of time. Data will be collected from these companies to measure real-world fuel savings potential and gain customer feedback.

See more information about CALSTART, Inc., Caterpillar Inc. and view a video about the hybrid excavator

Off-Road Large Size Excavator digging a ditch Off-Road Large Size Excavator two workers standing next to a large excavator

Photos courtesy of Caterpillar, Inc.



  • Will create 24 jobs by the fifth year of operation.

  • A reduction in fuel use and may reduce up to 25 percent of greenhouse gas emissions compared to conventional diesel fuel models.

  • May reduce 5,000 gallons of diesel and 67 tons of greenhouse gas emissions annually per hydraulic hybrid excavator.

  • Has effectively leveraged public investment, garnering more than $2.5 million in private investment.

Type of Project

Medium- and heavy-duty advanced vehicle demonstration

ARFVTP Award Amount



The first phase will be completed in early 2015. The second phase of the project will focus on developing additional models that use advanced hybrid technologies.


Locations of Calstart, Inc. and, Caterpillar Inc. in California


Caterpillar Inc.

Medium- and Heavy-Duty Advanced Vehicle Demonstration

CleanWorld Partners, LLC

Biofuel Production Plant

Community Fuels

Biofuels: Biodiesel

Electric Vehicle Charger Support

Electric Vehicle Charging Infrastructure

Electric Vehicles International

Electric Vehicle Manufacturing

Springboard Biodiesel, LLC

Biofuels: Biodiesel

Valley Garbage and Rubbish Company, Inc.

Natural Gas Infrastructure

Driving to Cleaner Transportation

Project Photo Tour