The European Network of Transmission System Operators for Electricity (ENTSO-E) says that grid operators in Serbia and Kosovo confirmed that deviations affecting the average frequency in the synchronous area of continental Europe have ceased.

ENTSO-E says it is working with the European Commission to identify a long-term solution to avoid a repeat.

​A political dispute between Serbia and Kosovo reportedly drew off enough energy from the local grid to cause a domino effect across the 25-nation electric power network that spans Europe.

The deviation from Europe's standard 50-hertz frequency was enough to cause electric clocks that keep time by the power system's frequency, rather than built-in quartz crystals, to fall behind by about six minutes since mid-January.

The missing energy amounted to around 113 gigawatt-hours, the grid operator said in early March. The problem mostly affected radio alarms, oven clocks or clocks used to program heating systems.

For the system to properly function, the grid operator says the frequency cannot fall below 47.6 or rise above 52.4 hertz. At the extreme values of 47.5 (under frequency) and 52.5 (over frequency), all connected generation and devices would disconnect. The average frequency for the period since mid-January 2018 until March 7 was around 49.996 hertz.