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Spain's grid operator warns about new voltage swings and urges measures to prevent blackout

In a letter sent to the market regulator CNMC, Spain's grid operator REE warned that it had detected sharp voltage swings over the last two weeks. These could affect power supply in a country that experienced a major blackout in April.

The CNMC urged that technical changes be made quickly to prevent any impact. The CNMC announced on Wednesday that it would be holding a public consultative meeting in the next few days to discuss urgent and provisional measures for stabilizing the system until a permanent solution is found.

The CNMC said that the rapid fluctuations in voltage recorded over the past two weeks could trigger disconnections in demand or generation, even though they are within the margins.

In a report published last Friday, the European network of electricity transmission systems operators stated that the massive blackout which hit the Iberian Peninsula April 28th was the first ever known to be caused by excessive voltage.

Like previous inquiries, the report pointed to an increase in voltage as being the immediate cause of Europe's biggest blackout in over two decades. The outage on April 28 paralysed many cities in Portugal and Spain and left people stranded in trains. Reporting by Corina Poans and Andrei Khalip; editing by Pietro Lombardi

(source: Reuters)