Parts of Blackpool Pleasure Beach were without electricity for around three hours on Saturday.
A power cut affected the south part of the park between 11am and 2pm, forcing the closure of a number of rides.
The Big One and Revolution rollercoasters were closed as a result of the incident, as were rides located in the Nickelodeon Land area of the park.
No one was stranded on rides, and power was restored by Electricity North West at around 2pm.
Pleasure Beach has offered guests that were in the park at the time a free return visit in compensation.