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A major power surge that resulted in a large-scale power outage across Spain and Portuguese regions has been classified as the "most serious" power disruption in Europe during the last two decades, and represents a pioneering situation of its category, according to a newly released study.

Damian Cortinas of the association of electricity grid operators announced that this notable event marked the initial documented power failure to be primarily triggered by overvoltage, which develops when surplus electrical pressure builds up within a system.

"This is new territory," the official commented, explaining that the organization's function was "not to assign responsibility to any entity" regarding the root origin.

The April's power failure produced significant disruption for approximately 24 hours when it threw numerous zones into powerless state, terminating digital communications and stopping transport links.

Broad Impact

The blackout impacted extensive regions of Spain and Portuguese nation, and momentarily influenced southern French territories.

The report, released on Friday, focused on the state of the electrical networks on the day of the blackout and the sequence of incidents culminating in it.

Infrastructure Malfunctions

A sequence of "sequential electrical spikes" - defined as an increase in the network electrical pressure above the established norm - was determined to be the primary cause behind the failure, the report concluded.

Voltage surge can be caused by spikes in grids due to excess production or lightning strikes, or when protective equipment are insufficient.

According to the study, automated protection systems were activated but were unable to stop the electrical network from failing.

Several Examinations

The investigation follows several separate investigations and studies by the Spanish government, as well as electrical providers. The national energy watchdog and parliament members are also conducting distinct examinations.

The Spanish government considers that the association's report validates its own findings.

The minister for environmental policy stated that it was "entirely consistent" with the findings of an examination it commissioned which concluded in summer that each of the national grid provider and independent power providers were culpable.

Conflicting Accounts

Both the main network manager and the private firms have maintained that they were not at fault. The parent company has assigned responsibility for the failure on certain coal, gas and nuclear power plants' shortcoming to help maintain correct power parameters.

Local power providers claimed it was caused by deficient strategy from network managers.

Examination Obstacles

The investigation also noted that certain crucial information was missing and that "gathering thorough, reliable details proved very challenging for this examination".

A definitive analysis, to be released in the beginning period of next year, will investigate the underlying reasons of the overvoltage and the procedures used to manage power parameters in the grid.

Governmental Debate

The outage triggered a extensive controversy that extended into the administrative domain about Spain's energy model.

The opposition proposed that an growing dependence on sustainable power, championed by the left-wing government of the prime minister, could have been a significant component in causing the failure and the country's decreasing supply of nuclear electricity meant a consistent reserve was not available.

The authorities roundly rejected these explanations and the recent study was careful to remain neutral when it came to the sources of April's unprecedented blackout.

Immediate Effects

The electrical failure forced Madrid Open Tennis organizers to stop a game partially completed play.

The country's nuclear stations automatically stopped when the failure hit, and the Spanish oil company stated it stopped production at its petroleum facilities.

Public Chaos

Edifices were cast into blackout, while mobile phones and intersection indicators failed to operate. Lines extended along street corners and card payments stopped working, obliging people to wait for currency and pack onto buses as alternative travel networks were non-functional.

Emergency workers were summoned to multiple edifices to rescue people trapped inside elevators in the central territory and healthcare centers activated emergency plans, halting routine procedures.