Yellow school buses go a little more green
Just ask any parent – yellow school buses, with their classic look, signature smell and rumbling sound, remain largely unchanged from decades past. But with advances in technology, those old buses are beginning to reach the end of the line.
A small but growing number of school districts are beginning to replace these older fossil fuel models with new electric buses. Motivated by evidence of the harmful effects of particulate emissions on both students’ health and performance and in an effort to reduce fuel costs and save on maintenance, a few innovative districts are making the transition.
The biggest obstacle is the significantly higher cost of electric buses, which can be at least two to three times as expensive as replacement buses powered by diesel or another alternative fuel (there are also costs associated with installing charging equipment). Districts are getting help to offset the extra costs from sources including grants and legal settlements. And several utilities, motivated by environmental concerns as well as the potential to help lighten the electrical grid load, have stepped up to help hasten the process.
On Dec. 16, Dominion Energy, a utility based in Richmond, Virginia, announced that it had chosen Thomas Built Buses, one of the oldest school bus manufacturers in the United States, to provide 50 electric school buses for districts across its home state. Sixteen school districts, including Alexandria, Arlington, Norfolk and Richmond City, are the first recipients, Dominion said in a statement Jan. 16.
Under the program, Dominion, which provides power to about 7.5 million customers in 18 states, will pay for infrastructure like the wiring and charging stations. An electric bus can cost as much as $400,000; the utility will absorb the $200,000 or greater cost difference between a diesel and an electric bus because many school districts find that prohibitive.
While estimates vary, Mark Webb, senior vice president and chief innovation officer for Dominion, said in an interview that the initiative is part of the company’s overall efforts to help reduce pollution and increase sustainability. “Transportation is the No. 1 source of emissions,” he said.
The announcement is just the first phase of the utility’s plan, Webb said. Dominion wants to increase the number of electric buses on the road so that by 2030, 100% of the new purchases are electric.
The Thomas buses, averaging 134 miles on a full charge of their 220 kilowatt-hour battery, are a blending of old and new. The company, which is based in High Point, North Carolina, began as a streetcar manufacturer in 1916 and started producing buses a little more than 80 years ago, said Caley Edgerly, the president and chief executive.
Its electric buses, named Jouley, not only draw from innovation within its parent company, Daimler, but also incorporate the technology of Proterra, an electric transit bus and battery manufacturer based in Burlingame, California, that has contracted to provide electric transit buses to 100 cities in the United States and Canada.
Dominion is following other utilities into the electric school bus market, including Consolidated Edison’s pilot project in White Plains, New York, and the Sacramento Municipal Utility District in California. The utilities’ interests stem from two distinct goals.
The first is the impact the buses have on reducing pollution. School buses are often thought to be the safest form of transportation for children, “yet, when you look at the particulate emissions from tailpipes, buses are not the safest when it comes to health,” said Tim Shannon, the director of transportation for the Twin Rivers School District in Sacramento, which operates 25 electric school buses built by Lion Electric in Canada, believed to be the largest fleet in the country.
The impact of pollution on health has long been documented, but two recent reports highlight the effect of emissions on academic performance as well. One study showed that students in schools that are “downwind” from major highways score lower than those in upwind schools, while another looked specifically at the decline in academic performance, particularly in English, that correlates with time spent on a diesel bus.
Additionally, electric school buses have a unique potential to help the power grid. Unlike those used in mass transit, school buses sit idle for many hours per day, as well as during the summer months when power usage often peaks. During those down times, the bus batteries are capable of sending stored electricity back to the grid. This ability – known as vehicle to grid, or V2G – can be used to help ease the load on the grid. “Not only can we control when the buses charge, but the batteries can store renewable energy if there is excess,” Webb explained.
The power stored can also be drawn on in emergency situations. “During a crisis, we could use these buses to be part of a microgrid to power emergency response centers,” Webb said.
The electric bus manufacturers, including Blue Bird, based in Fort Valley, Georgia, which has supplied those used in the Con Edison trial, and Navistar, based in Lisle, Illinois, which hopes to ship its first models this year, recognize that this is a potentially huge market.
Approximately 26 million students ride on 485,000 school buses nationwide, said Michael Martin, executive director and chief executive of the National Association of Pupil Transportation. While electric transit buses have been in operation for years, the school bus market – which when aggregated comprises the largest fleet nationwide – has been slow to adapt.
The reason is largely economic: Electric buses are more expensive. For transit buses, which may travel 50,000 miles per year, the savings in fuel and maintenance make the transition cost effective. School buses, in contrast, on average can cover 12,000 miles per year, and, as a result, it can take years to offset the higher purchase price.
Paul Harrison, who drives for the Twin Rivers School District, plugs in his electric school bus after morning pickup in Sacramento, Calif., on Dec. 18.