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üstra Hannover again chooses Allison hybrid articulated buses

üstra Hannoversche Verkehrsbetriebe AG (üstra) has taken delivery of nine additional Solaris Urbino 18-meter articulated buses equipped with the Allison H 50 EP™ hybrid system.

HANNOVER, Germany, 17th of October 2013 – üstra Hannoversche Verkehrsbetriebe AG, also known as “üstra,” first tested the Solaris Urbino 18-meter bus equipped with Allison’s H 50 EP™ hybrid system in 2008. After the successful testing phase 10 additional hybrid buses drive on line 121 since September 2011. Due to ecopolitical reasons the region of Hannover and üstra together decided to continue focusing on hybrid bus technology. From a recent tender, Solaris has now provided nine additional articulated buses with the Allison hybrid system.

Hubert Nawa, responsible for vehicle engineering and bus workshops for city buses at üstra, explained why it was an easy decision. “The buses, especially the Allison H 50 EP™ hybrid systems, are reliable. In addition, they are fuel-efficient, accelerate quickly after a stop and slow down smoothly via the hybrid unit. Of particular note is the quiet operation; we get very positive feedback from passengers and residents,” Nawa finished.

The new three-axle, 18-meter articulated buses will replace older vehicles. Satisfying demand as local passenger numbers increase, articulated buses are the current trend in Hannover. The buses were delivered in early October, awaiting inaugural runs planned for October 27, 2013 on the occasion of a hybrid bus festival in Hannover.

The buses will primarily be used on lines 127, 125 and 123, where short distances between stops, low average speeds and a high concentration of passengers are typical. During stop and go runs, the benefits of these hybrid buses – reduced fuel consumption, emissions and noise pollution as well as recovered braking energy – are most significant. The 11 already proven hybrid buses have operated on line 121 under similar conditions. Since September 2011, these buses have accumulated about 1.3 million kilometers (808,000 miles) in regular service, transporting nearly 10.5 million passengers.

Unique Allison hybrid technology
The Allison H 50 EP™ system features a unique two-mode parallel hybrid architecture which blends torque delivered by two electric 75 kW generators with torque generated by a 181 kW (246 hp) Cummins ISB6.7 250H diesel engine. The electric motors contribute substantially to bus launch, relying less on the diesel engine to produce power and torque. High-capacity batteries save the energy released during braking to reuse during accelerations, making the most efficient use of available energy. This offers an important advantage for üstra’s bus fleet, which covered more than 12 million kilometers (7.5 million miles) in 2012.

October 2013

About üstra Hannoversche Verkehrsbetriebe AG
With approximately 159 million passengers, üstra is one of the largest public transport companies in Germany. The fleet consists of 130 buses, 67 of these are articulated buses and 63 are solo buses. With 38 lines, üstra connects 677 stops over about 515 kilometers (320 miles).

About Allison Transmission
Allison Transmission (NYSE: ALSN) is the world’s largest manufacturer of fully automatic transmissions for medium- and heavy-duty commercial vehicles and hybrid-propulsion sys-tems for city buses. Allison transmissions are used in a variety of applications including re-fuse, construction, fire, distribution, bus, motorhomes, defense and energy. Founded in 1915, the company is headquartered in Indianapolis, Indiana, USA and employs approximately 2,800 people worldwide. With a market presence in more than 80 countries, Allison has re-gional headquarters in the Netherlands, China and Brazil with manufacturing facilities in the U.S., Hungary and India. Allison also has approximately 1,400 independent distributor and dealer locations worldwide. For more information, visit

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