This is a list of major hydroelectric power station failures due to damage to a hydroelectric power station or its connections.Every generating station trips from time to time due to minor defects and can usually be restarted when the defect has been remedied.Some hydroelectric power station failures may go beyond the immediate loss of generation capacity, including destruction of the turbine itself, reservoir breach and significant destruction of national grid infrastructure downstream.Where a generating station is large compared to the connected grid capacity, any failure can cause extensive disruption within the network.A serious failure in a proportionally large hydroelectric generating station or its associated transmission line will remove a large block of power from the grid that may lead to widespread disturbances.