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Spain's watchdog reviews grid control rules

The Spanish Competition and Energy Watchdog announced on Thursday that it had updated the rules for power plants regarding the voltage control of the power grid in order to increase the role renewables play.

It has been a long time coming, and the Spanish government's report on the causes for the massive blackout in Spain and Portugal that occurred on April 28, recommended its approval.

According to the government investigation, a sudden surge in voltage caused the power outage.

These updated rules, which are mostly 25 years old, include new requirements when it comes voltage control mechanisms for renewable plants such as solar and wind. These plants will now be able offer voltage control services previously only available to conventional power plants, such as thermal power plants that use coal, gas or nuclear energy.

When grid operator REE calculated power mix for the next day, they could only rely on conventional power plants as the majority of the voltage control capability.

In a press release, the authority stated that the new framework "gives homogeneous treatment" to both renewable energy and other generation facilities.

It said that the review was approved by the Spanish government last week. The blame game has intensified over the blackout after discrepancies between the investigations conducted by the Spanish Government and the grid operator of the country.

The former blames both the grid operator, for miscalculating energy mix on that particular day, and power generators for failing to maintain a proper voltage level in the system. However the latter puts the blame squarely on the power plants.

The grid operator made a proposal in 2021 that led to the development of this update. (Reporting and Editing by Louise Heavens, Pietro Lombardi)

(source: Reuters)