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PIA Press Release
2010/05/21

NGCP says Leyeco II 1-hour power outages caused by load shedding by energy supplier

Tacloban City (21 May) -- The National Grid Corporation of the Philippines claimed responsibility to the brown-outs at 4:26 in the afternoon to 8:45 in the evening of May 19 which affected the whole of Eastern Visayas.

However, it is quick to say that the brownouts currently being experienced by the various feeders under the Leyeco II coverage must not be attributed to the agency.

"Today's brownout is caused by Visayas Grid generation deficiencies," NGCP's Mr. Ruel Tobias informed the Philippine Information Agency. The energy supplier of Leyeco II is Green Core Geothermal Power Plant, he added.

This was confirmed by Mr. Ely de Paz, a Leyeco II staff who said that the one hour power outage being experienced by the consumers in the various feeders under the cooperative is due to load shedding as informed by the Green Core Geothermal Power Plant.

The same staff disclosed that load shedding will continue until the end of the month of May.

Load shedding, also referred to as a rolling blackout, is an intentionally-engineered electrical power outage. Load shedding is a last resort measure used by an electric utility company in order to avoid a total blackout of the power system. This is usually in response to a situation where the demand for electricity exceeds the power supply capability of the network. Load shedding may be localized to a specific part of the electricity network or may be more widespread. Load shedding generally results from two causes: insufficient generation capacity or inadequate transmission infrastructure to deliver sufficient power to the area where it is needed.

Ms. Edna Legaspina, corporate communications officer of the National Grid Corporation of the Philippines (NGCP) at Ormoc City, informed that NGCP has fully restored power transmission services to its Visayas grid customers on Wednesday evening, May 19 at 8:45 in the evening after the Compostela-Talisay line tripped at around 4:26 in the afternoon.

Ms. Legaspina informed that initial investigation shows that the line tripping was caused by construction-works being done on a couple of NGCP towers.

The line disturbance in Compostela-Talisay triggered the tripping of the Leyte-Cebu submarine cable resulting to the isolation of the Cebu-Negros-Panay (CNP) grid from the geothermal power sources in Leyte. This consequently increased the power deficiency of the grid. Power supply to Bohol was likewise affected by the interruption.

An estimated load of 360 megawatts (MW) was dropped in the Visayas, Ms. Legaspina informed.

Power interruptions were experienced mainly in Eastern Visayas including the provinces of Leyte, Southern Leyte, Biliran, Samar, Northern Samar and Eastern Samar.

As part of NGCP's emergency restoration procedures, feeders were manually opened to normalize system frequency and protect the stability of the entire Visayas grid.

While NGCP has energized the Compostela-Talisay line and fully addressed the transmission constraints by 8:45 in the evening of Wednesday, power interruptions continue to be experienced in most parts of the Visayas grid because of generation deficiencies. The recent maintenance shutdown of the privately owned Cebu Energy Development Corporation's (CEDC) generating plant has limited the supply of power in the grid.

Manual load dropping is being implemented by the power system operator to ration the available power in the Visayas grid and ensure the reliability and stability of the entire power network.

NGCP assures its customers that all measures are being done to ensure that transmission lines and facilities across the country are in good condition and able to deliver whatever power is available from the generating plants. (PIA 8) [top]

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