The Gillig Corporation of Hayward, California, manufactures 270 hybrid buses per year and guarantees them for the same twelve-year service life expected of a conventional bus. More than 1000 hybrid buses made by Gillig and five other manufacturers using the GM/Allison Two-Mode system are now operating in eighty-six North American cities and Yosemite National Park.
Even though the hybrids have been operating in Ann Arbor for less than a year, the AATA intends to switch its entire fleet to green machines as its conventional buses reach the end of their service lives. Two years ago, Ann Arbor's city council established a greenhouse gas reduction target of 20 percent (lower than 2000 levels) by 2015. The AATA intends to do its part to meet that goal.