Rowena Guevara The Department of Energy (DOE) expects three yellow alerts in the Luzon grid for the remainder of the year, citing the El Niño weather phenomenon that will affect power generation in hydroelectric facilities. Energy Undersecretary Rowena Guevara said two yellow alerts were expected in the power-hungry island group in October, while another was projected to be raised in November. Yellow alerts are issued when the operating reserve is not enough to meet the transmission grid's contingency requirements, but these do not usually result in power outages.

https://business.inquirer.net/425549/yellow-alert-risks-raised-but-enough-power-supply-assured-for-oct-polls

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