The Twin City buses were supposed to go 150 miles on a single charge, but the actual range was closer to 75 miles . . .
The Proterra buses in Duluth struggled to make it up steep hills and to keep riders warm in winter.
Proterra technicians installed diesel-powered heaters on the buses and increased the battery capacity so they could handle steep hills and subzero temperatures, which degrade the performance of electric vehicles.
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