The 2006 European blackout was a major blackout which occurred on Saturday, November 4, 2006. More than 15 million clients of the European Network of Transmission System Operators for Electricity did not have access to electricity during about two hours on this date. The immediate action taken by the Transmission System Operators prevented the disturbance from turning into a Europe-wide blackout.
The cause of this major blackout was a planned routine disconnection of the Ems powerline crossing in Northwest Germany to allow a ship to pass beneath the overhead cables. In September, the shipyard had requested the lines, called Conneforde–Diele red and white, to be shut off starting at 01:00 on 5 November. This change was communicated to the neighboring TSOs and they did simulations to ensure stability. As a result, the planned power flow between TSOs was decreased for 00:00 to 06:00 5 November. On 3 November, the shipyard requested the shut-off to be advanced to 2200 on 4 November. E.ON Netz thought that this would be more favorable and approved the request. However, this change was not communicated to the neighboring TSOs until very late so a full analysis was not done. Also, the transfer capacity had already been sold and it was not possible to change it except for force majeure.
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