Trolleybuses are great for hills because they are constantly drawing power from the grid. It’s why Seattle has committed to trolleybus expansion for its hilly network.
Regenerative braking is very straightforward, making hills a great place to use electric. A nice additional benefit of regenerative braking is stop-and-go driving, like buses do, is hell on brakes and efficiency. Regen allows improved efficiency while saving the brakes. And incidentally, my ears - buses and trucks with worn out brakes make terrible screeching noises which IMHO are among the most unpleasant components of city noise. Regen braking saves the brakes and mostly eliminates this problem.
Trolleybuses are great for hills because they are constantly drawing power from the grid. It’s why Seattle has committed to trolleybus expansion for its hilly network.