> Home > Divisions & Departments > Public Works > Fleet Management > Commitment towards a cleaner environment

Commitment towards a cleaner environment

A program of Fleet Management

The City currently operates 123 Bi-Fuel vehicles (vehicles that run on compressed natural gas and gasoline). The City also operates 9 trolleys and all diesel fueled vehicles on Bio-Diesel, a cleaner-burning fuel that qualifies under the alternative fuel criteria.


  • In 1981, Scottsdale conducted an in-depth, one-year study of compressed natural gas (CNG) conversions, which concluded with a bid award for a compressed natural gas station located at our South Corporation Yard facility and vehicle conversion kits.
  • Converted 84 city vehicles in 1982 to run on compressed natural gas on its initial entry into its alternative fuel program.
  • In 1983, the fleet was increased to 92 vehicles, but was then put on hold due to gasoline costs decreasing.
  • The project was revived and expanded when the Maricopa Association of Governments (MAG) in 1988 declared a commitment to improving the Valleys air quality, followed by the State Legislature on alternative fuels, and the Federal Clean Air Act Amendments of 1990.
  • 1 CNG fueling facilities (1 public - Grand Opening, January, 1998)
  • 2003 - The City’s private CNG station, located at the south fueling facility was removed.
  • 2003 - Bio-Diesel above ground fuel tank was installed at the south fueling facility.
  • 2004 - The City’s two main diesel tanks were switched over to Bio-Diesel fuel, enabling all the City’s diesel fleet to run on the cleaner-burning fuel that qualifies under the alternative fuel criteria.

CNG Benefits

  • CNG burns cleaner
  • Vehicles fueled with natural gas produce lower levels of harmful pollutants than gasoline or diesel vehicles
  • Natural gas vehicles reduce emissions of carbon monoxide and reactive hydrocarbons (which play a major role in formation of ground-level ozone, the principal ingredient of smog)
  • Natural gas contains no particulates such as those associated with diesel fuel, and also reduces emissions of carbon dioxide - the principal "greenhouse" gas
  • Vehicle emissions are lower with natural gas than with gasoline because ignition temperatures are higher and combustion is more efficient
  • CNG is readily available; the United States has a huge natural gas resource base
  • All 50 states and all major metropolitan areas have access to natural gas and are not dependent on other countries
  • Natural gas is also piped directly to the fueling station, reducing the need to transport the fuel, as well as, eliminating the need of ordering and delivery schedules
  • Natural gas as a vehicle fuel actually costs less today than conventional gasoline and much less than methanol.


  • Bio-Diesel burns cleaner.
  • Bio-Diesel has lower emissions than petroleum diesel, producing less unburned hydrocarbons, carbon monoxide & particulate matter.
  • Bio-Diesel is better for the environment, because it is made from renewable resources.


  • Continue adding additional vehicles that run on bi-fuels (CNG/gasoline)
  • Promote the City’s use of CNG
  • Expand Bio-Diesel fuel program