Which sentence incorrectly uses a hyphen?

In 1817, the first traditional high-speed roller coaster with cars attached to a track was built in Paris.
Most roller coasters aren't powered-electrically; instead, they are pulled up a hill and released.
Roller coasters use potential and kinetic energy to bring joy to thrill-seeking riders around the world.
The first roller coasters were known as "Russian mountains" which were wood-braced hills of ice that people would sled down.