NEPRA releases report on power breakdown

ISLAMABAD: The federal government Monday notified up to Rs2.89 per unit hike in power tariff for K-Electric consumers effective from September 1. The Power Division notified the increase from Rs1.09 to Rs2.89 per unit. The K-Electric will increase the power price from September 1. The notification states, “In pursuance of sub-section (7) of Section 31 of the Regulation of Generation, Transmission and Distribution of Electric Power Act, 1997, the federal government is pleased to notify as under the adjustment approved on account of quarterly adjustments wef September 1, 2020 as determined as recommended by National Electric Power Regulatory Authority (NEPRA) vided decision of dated December 31, 2019 in respect of K-Electric Limited,” the Power Division said in notification.” The Power Division said the recommended quarterly adjustment to the tune of Rs4.87 being differential between the schedule of tariff recommended by Nepra for April-June 2019 and the schedule of tariff earlier recommend by Nepra and reflected in the K-E notification be notified for each category of consumer to the extent of bringing K-Electric consumers end tariff on a par with what is currently in field for consumer of XWDISCC (increase in rate of Rs1.09 to Rs.2.89/kWh for various categories of consumers) approved/ratified by the Cabinet Division on September 11, 2020. Any difference between the two rates be made available by way of subsidy which shall amount to Rs26 billion only. The base tariff for the K-Electric was Rs11.22 per unit, which would be increased by up to Rs2.89 per unit following the notification. The Nepra had determined an increase of Rs4.87 per unit or 44 percent in power tariff on account of previous years’ adjustments. The total revenue impact of tariff hike of Rs4.87 per unit was nearly Rs106 billion.

ISLAMABAD: The National Electric Power Regulatory Authority (NEPRA) has released inquiry report on major power breakdown in the country.

According to the report, on 09th January, 2021 at 23:40 hours, on closing of a 220kV Circuit Breaker at Guddu switchyard, bolted fault occurred as the earth switch of related Isolator was left closed.

This bolted fault was not cleared due to malfunctioning of the relevant Circuit Breaker and the subsequent breaker failure scheme. The above persistent fault reflected on 220kV and 500kV transmission lines which tripped on Distance Relays in zone 2 and Unstable Power Swing respectively.

The restoration process was initiated quickly by the power plants and NTDC, the System Operator. Some of the power plants did not respond to the notice to synchronize (NTS) by the system operator and took more time than the specified.

Similarly, KE also acted quickly by getting supply from Tapal and Gul Ahmed power plants as its own machines of BAPS-II were not available in island mode, Since KCCPP was under shutdown due to low gas pressures, therefore, and its island facility could not be utilized.

Most of the thermal power plants were synchronized with NTDC within 27 hours. The WAPDA Hydel power plants were synchronized with the National Grid within 20 hours. In case of K-Electric, the power plants were synchronized with its system in 17 hours. Overall, NTDC s power supply was restored in 20 hours, whereas KE took about 22 hours for the restoration. NTDC, KE and concerned power plants do not have contingency plans and SOPs for system recovery under total and/or partial shutdown of power supply.

The report suggests that in order to address Unstable Power Swing Phenomenon, a comprehensive study should be arrange from a reputable international firm to avoid such incidents in future.

The black start facility shall be made available at power plants to be identified by NTDC. Moreover, a function should be developed at the Power House of 200MW and above that at least one machine shall remain available in island mode during under frequency situation to facilitate early restoration.

For sequential tripping instead of simultaneous outage of machines on over frequency, settings shall be managed accordingly.


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