Spain finally says what caused its huge nationwide blackout
A major power outage that paralysed the Iberian Peninsula in April was caused by "overvoltage" on the grid that triggered "a chain reaction", according to a government report released Tuesday.
News Moderator - Tomas Kauer 
A major power outage that paralysed the Iberian Peninsula in April was caused by "overvoltage" on the grid that triggered "a chain reaction", according to a government report released Tuesday.
