Denali National Park and Preserve is taking steps to reduce greenhouse gases and improve wildlife viewing for tourists by switching a portion of its bus fleet from diesel to propane fuel starting this spring.
Two new hybrid shuttle buses are also scheduled to begin operating, officials said.
The result should be a quieter experience and cleaner air for the more than half a million tourists who visit the park each year, many hoping to spot bears or caribou from the buses traveling the 90-mile road winding into the park.
"There's incredible potential that they'll be much quieter, with much lower emissions, and I think visitors will be more comfortable with that," said Andrew Gertge, a commercial services specialist with the 6-million-acre park that boasts the continent's highest mountain.
Proponents of the idea hope the buses serve a broader purpose in Alaska by highlighting the benefits of propane, including its cost, said Mary Ann Pease, an Alaska energy consultant. Pease said propane, a gas at normal temperature and pressure, is cheaper than diesel fuel. Propane liquefies easily for transport and storage.
Pease said school districts might see the economic value of propane, helping create an in-state market for the large quantities of propane that can produced on the North Slope.
"I think this is going to show a demand for propane in our state, and with that comes opportunity," Pease said.
One of Pease's clients is Roush CleanTech, based in Livonia, Michigan, which has teamed up with bus manufacturer Blue Bird to create a liquid propane injection system for propane-powered buses, large numbers of which are already in use in the Lower 48.
School districts nationwide are increasingly interested in propane as an alternative to diesel, according to a 2014 Department of Energy case study. The study reported that using propane reduced both fuel costs and greenhouse gas emissions.
The idea for using the propane buses in Denali is included in the park's contract with its concessionaire, a joint venture between Doyon, a regional Native corporation, and Aramark, an international food service company, Gertge said.
After serving as the park's concessionaire for the last 13 years, the joint venture this summer beat out other companies for the right to provide concession services again, such as bus rides and campground rentals in the park, for another decade. The concessionaire currently operates more than 50 buses that resemble a standard school bus, Gertge said.
The buses were an important part of the proposal because they will help the park meet its mission of reducing noise and emissions in the park, Gertge said.
"This shows a real commitment from the joint venture," he said. "The park was very encouraged by the prospect of modernizing the fleet and making the experience more environmentally friendly."
Fourteen propane buses will arrive at the park this spring from the Lower 48, said Todd Mouw, vice president of sales and marketing at Roush CleanTech. They were ordered after one was tested in Alaska last fall, he said.
In a separate effort initiated by park officials, the park is buying two new hybrid buses that use diesel power or electricity to shuttle tourists along the 14-mile paved section at the park's entrance, Gertge said.
The park service paid for those buses and two other hybrid buses that it has previously tested using a $956,000 federal grant.
The first two hybrid buses were tested starting seven years ago and didn't perform well on the dirt portion of the road, with the dust, mud and ruts causing high maintenance costs.
Also, the diesel engine needed to run too often, including during wildlife stops.
"They were not significantly more fuel efficient and were louder than we wanted them to be," Gertge said.
The updated hybrid buses are expected to perform better. They'll be smaller than the large buses that seat some 50 passengers, and be limited to the pavement, reducing the abuse they take, he said.
Along with the propane buses, they will help the park take a big step toward improving the fuel-efficiency of its bus fleet, he said.
Alaska Dispatch Publishing