2003 Italy blackout

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The 2003 Italy blackout was a serious power outage that affected all of Italy—except the island of Sardinia—for 9 hours and part of Switzerland near Geneva for 3 hours on 28 September 2003. It was the largest blackout in the series of blackouts in 2003, affecting a total of 56 million people. It was also the most serious blackout in Italy in 20 years.

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[edit] Causes

Power went off at about 03:20am local time on 28 September 2003. Initial reports from Italy's electricity supplier, ENEL, stated that the power line which supplied electricity to Italy from Switzerland was damaged by storms, causing it to trip and also the two 400kV power lines between France and Italy to trip due to sudden increased demand from those two power lines. The cascading effect disrupted power supply to Italy from France and Switzerland. ENEL lost control of the grid in the next 4 seconds, with the lines tripped one by one amid the cascading effect. Swiss electricity company ATEL later concurred that a power line between Switzerland and Italy went out for a few hours.

[edit] Effects

The night of 27 September 2003 is the night of the annual overnight White Night Carnival in Rome, the capital of Italy. Thus, many people were on the streets and all public transportation were still operating at the time of the blackout (at about 3am on 28 September 2003) despite the fact that it was very late at night. The blackout caused the carnival to end early. Several hundred people were trapped in underground trains. Coupled with heavy rain at the time, many people spent the night sleeping in train stations and on streets in Rome.

Throughout Italy, 110 trains were canceled, with 30,000 people stranded on trains. All flights in Italy were also cancelled. Police described the scene as chaos but there were no serious accidents.

The blackout, however, did not spread further to neighbouring countries, such as Austria, Slovenia and Croatia, which are connected to Italy. Only part of the Geneva Canton of Switzerland suffered a power outage for three hours.

[edit] Restoration of service

After 3 hours, energy was restored in some regions connected to France (such as Liguria). Nine hours later, in the afternoon of 28 September, electricity was restored gradually in most places, including Turin, Milan, Venice and Rome. Rolling blackouts continued to affect about 5% of the population on the next two days (29-30 September) as the electricity company ENEL continued its effort to restore supply.

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