European grid dispute resolved, lost 6 minutes returned to oven clocks
Sunday April 8, 2018. 08:30 PM , from Ars Technica
This week, Europe's electric transmission lobby announced that oven, microwave, and alarm clocks across the continent were no longer six minutes slow. How did they get back the lost time? By resolving a grid dispute between Serbia and Kosovo and running the continental grid at a slightly higher frequency than normal.
That's because clocks that are connected to an outlet often tell time by counting the rate of the electrical current, and on the Continental Europe Power System the clocks expect an average frequency of 50Hz. But between mid-January 2018 and early March, a grid dispute between Serbia and Kosovo resulted in 113GWh of unmet demand from Kosovo. Since Kosovo is part of the Continental Europe Power System, the unmet demand on the 25-country system led to a system-wide decline in frequency to an average frequency of 49.996Hz. That meant that clocks were counting down minutes too slowly, and, over three months, connected clocks around the continent lost six minutes.
Last month, the European Network of Transmission System Operators (ENTSO-E) publicly admonished Serbia and Kosovo for not properly balancing their grids according to previous agreements. 'This average frequency deviation, that has never happened in any similar way in the CE [Continental Europe] Power system, must cease,' the group wrote. 'ENTSO-E is urging European and national governments and policymakers to take swift action.'
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