<p>Unscheduled power outages affected several parts of Luzon after it was placed under red alert on Monday, May 8 following problems at a power plant in Masinloc, Zambales, the National Grid Corp. of the Philippines (NGCP) announced.&nbsp;</p>
<p>In an advisory, the NGCP said the red alert&nbsp;will last from 1 PM. to 4 PM while a yellow alert has also been issued from 6 PM to 8 PM.&nbsp;</p>
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<div id="google_ads_iframe_/2744311/ABSNews_ArticleBanner_0__container__"><iframe id="google_ads_iframe_/2744311/ABSNews_ArticleBanner_0" tabindex="0" title="3rd party ad content" role="region" name="google_ads_iframe_/2744311/ABSNews_ArticleBanner_0" width="1" height="1" frameborder="0" marginwidth="0" marginheight="0" scrolling="no" aria-label="Advertisement" data-google-container-id="3" data-gtm-yt-inspected-5="true" data-gtm-yt-inspected-10="true" data-load-complete="true"></iframe>&ldquo;A red alert status is issued when the power supply is insufficient to meet consumer demand and the transmission grid&rsquo;s regulating requirement,&rdquo; the NGCP said.</div>
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<p>&ldquo;A yellow alert is issued when the operating margin is insufficient to meet the transmission grid&rsquo;s regulating and contingency requirement.&rdquo;</p>
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<p>Based on NGCP&rsquo;s official Twitter account, power interruptions were reported in a number of provinces, including Isabela, Quirino, and Ilocos Sur.</p>
<p>The advisory comes&nbsp;after a transmission line and 2 units of Masinloc Power Plant tripped off at past 1 PM today affecting the Luzon grid. &nbsp;</p>
<p>Following this advisory from the NGCP, the Manila Electric Company (Meralco) said it is implementing rotating power interruptions for up to two hours in some of its franchise areas.</p>
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NGCP: Luzon grid under red alert after plant shuts down