- Lakvijaya (Units 1 and 3: 25 days in June and July, Unit 2: 60 days in Oct.-Nov.)
- KCCP2 (12 weeks in Nov.)
- Kotmale Unit 2 (7 weeks in Oct.)
- Ukuwela Unit 1 (3 months)
- Victoria Unit 3 (6 weeks)
Five major power plants are scheduled for maintenance outages from June this year, impacting electricity generation capacity, as stated in the tariff revision proposal letter submitted by the Ceylon Electricity Board (CEB) to the Public Utilities Commission of Sri Lanka (PUCSL) on Friday (16).
The letter has outlined that the Lakvijaya Power Plant will undergo maintenance on Units 1 and 3 with 25-day outages in June and July respectively, while Unit 2 will be offline for 60 days from October to November.
The Kelanitissa Combined Cycle Power Plant (KCCP2) is set for a 12-week maintenance starting November. Additionally, Unit 2 of the Kotmale Hydroelectric Power Plant is scheduled for a seven-week outage beginning in October, Ukuwela’s Unit 1 for a three-month outage, and Victoria’s Unit 3 for six weeks.
It is stated in the letter that the generation dispatch plan has been revised to incorporate the most recent data on hydroelectric reservoir levels, which have risen considerably due to an unexpected surge in rainfall.
This unusually high precipitation, particularly rare during the early months of the year, has significantly increased water inflows, thereby enhancing the availability of hydro resources for power generation.
Furthermore, the weather forecast issued by the Department of Meteorology for the period from May to July 2025 (Annex V) was taken into account during the assessment.
Based on this forecast, rainfall patterns for the upcoming months are expected to vary as follows: during May, there is a likelihood of experiencing near-normal to slightly above-normal rainfall levels; in June, rainfall is anticipated to fall below normal levels; and by July, precipitation is again projected to be near or slightly above the typical averages for that time of year.
With improved initial hydro storage, increased hydro generation has been allocated for the rest of the period, while managing reservoir drawdowns during the forthcoming southwest monsoon to avoid reservoir spilling, as stated in the letter.
The Sobadhanavi IPP Thermal Plant (312 MW) will commence commercial operation in combined cycle mode from June.
Accordingly, in the last seven months of 2025, approximately 3224.2 GWh of energy is expected from hydro, while thermal and other renewable energy sources are anticipated to contribute 3,814.9 GWh and 2,810.4 GWh, respectively. The expected hydro inflow is estimated at 3,277.9 GWh, the letter states.