The Hon. Kumara Jayakody - Minister of Energy

¶ 01 Hon. Speaker, the answers are as follows.

¶ 02 (a)(i) Annual net generation contribution to the National Grid by Lak Vijaya from 2020 to 2025 (GWh), by Unit:

¶ 03 2020: Unit 1 – 1,769.97; Unit 2 – 1,593.41; Unit 3 – 1,876.53; Total – 5,239.91 2021: Unit 1 – 1,740.55; Unit 2 – 1,875.53; Unit 3 – 1,903.0 (as per annex total); Total – 5,519.04 2022: Unit 1 – 2,033.04; Unit 2 – 1,295.42; Unit 3 – 1,845.31; Total – 5,173.78 2023: Unit 1 – 1,901.93; Unit 2 – 1,176.58; Unit 3 – 1,742. (as per annex); Total – 4,645.52 2024: Unit 1 – 2,042.27; Unit 2 – 1,428.87; Unit 3 – 2,010.40; Total – 5,481.54 2025: Unit 1 – 1,780.45; Unit 2 – 1,309.00; Unit 3 – 1,780.83; Total – 4,870.28

¶ 04 (a)(ii) Details of all planned and unplanned shutdowns, with number of occurrences, dates, and reasons for each generating unit, are provided in Annexes 2A, 2B and 2C, and tabled. Some outages were due to external factors such as total system failures or transmission faults; these are marked in a special column. In some cases, units were taken offline on instructions from the System Control Centre, mainly due to low demand.

¶ 05 (a)(iii) Time is required to compile comprehensive system-wide disruption data. The CEB’s ongoing restructuring means this is not a routine system output. We will obtain data from the System Control Centre and submit detailed information separately at the earliest. I request two weeks to furnish this part.

¶ 06 (a)(iv) As noted in (a)(ii), reasons for each unit’s shutdowns are listed in the annexes. External disturbances (system-wide trips and transmission faults) contributed to some incidents. At times, units were taken offline on System Control instruction, mainly due to reduced demand.

¶ 07 (a)(v) Measures are being taken to ensure continuous operations, including: - Control system logic modifications and enhancement of protection settings, including ROCOF relays, to minimise unnecessary trippings due to external faults; - Steps to prevent turbine diaphragm failures and thereby reduce prolonged outages and minimise restart delays after system-wide failures.

¶ 08 Annexes 2A, 2B and 2C tabled.

¶ 09 (b) Not applicable.