NGCP’s FOT registered significant improvements in all major island grids in the country. In Luzon grid, FOT decreased by 73% from 4.265 in 2009 to 1.1380 in 2016; Visayas grid by 86% from 3.6260 to 0.5168; and Mindanao grid by 67% from 2.6200 to 0.8600. Frequency of Tripping (FOT) is a key performance indicator which measures the number of times the high-voltage transmission lines tripped or experienced forced outages for every 100 circuit kilometers (ckm).
Several system upgrades and facility expansions were implemented to improve System Availability (SA) ratings, which are recorded at 99.5702% for Luzon grid, 99.8013% for Visayas grid, and 99.7320% for Mindanao grid, respectively, in 2016. Luzon grid’s rating this year is higher compared to the 2015 figure of 99.4125%. The other grids maintained the same ratings posted last year. SA ratings, as a performance indicator, measures the percentage of the entire transmission system available or operating normally during a given period.
The Congestion Availability Indicator (ConA), which measures the congestion experienced by lines identified as critical and whose loss would severely impact Wholesale Electricity Spot Market (WESM) operations, reached a positive rating of 99.7209% this year from 99.5830% in 2015.
All three grids also reported an almost 100% compliance with voltage and frequency limits. These limits are measured by the percentage of time during a given period that the system frequency or voltage is within the allowable limits. The Luzon grid, particularly, reported 100% Frequency Limit Compliance (FLC) or no frequency violations for the 2015-2016 evaluation period. Visayas grid improved its FLC from 99.8603% last year to 99.8869% this year. Mindanao grid remains stable, with FLC posted at 99.9934% in 2015 and 99.9739% this year. Meanwhile, the Voltage Limit Compliance (VLC) of all 3 grids retained its 99% rating in 2015, with the Luzon grid at 99.94%, the Visayas grid at 99.96%, and the Mindanao grid at 99.99% for 2016.
For frequency, the allowable range is 60 ± 0.3 Hertz (Hz) or 59.7 Hz to 60.3 Hz. Voltage variances are mandated not to exceed ± 5% of the nominal voltage (500kV, 230kV, or 138Kv) per facility particularly during the peak load hours. This means that at peak load hours, a 500kV line should maintain a voltage of 475kV to 525kV, and so on. For Luzon, the highest peak is registered at 2pm. In the Visayas and Mindanao grids, the highest peak registered is at 7pm.
“NGCP is pleased to report that from 2009 to the present, it has consistently complied with, if not exceeded, the performance targets set upon by ERC. This is a tangible result of the continuous upgrade, expansion, and reinforcement of our facilities. Many technical changes have been implemented to systematically improve operations to build a stronger power grid. Improvements on corporate governance also resulted in more efficient and streamlined operational practices. Our customers can expect that NGCP will continue to look for opportunities to maintain or even surpass its yearly performance, and push further its level of excellence, to provide better services to customers,” stated NGCP.
NGCP is a privately owned corporation in charge of operating, maintaining, and developing the country’s power grid. It transmits high-voltage electricity through “power superhighways” that include the interconnected system of transmission lines, towers, substations, and related assets. The consortium, which holds the 25-year concession contract to operate the country's power transmission network, is comprised of Monte Oro Grid Resources Corp. led by Henry Sy, Jr., Calaca High Power Corporation led by Robert Coyiuto, Jr., and the State Grid Corporation of China (SGCC) as technical partner.
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