Hydropower generation in Sri Lanka has dropped to as low as 21%, according to the latest statistics from the Ceylon Electricity Board (CEB), following a prolonged dry spell. 

According to CEB Spokesman Eng. Dhammike Wimalaratne, the hydro storage levels are being closely managed by the Mahaweli Authority and the Agriculture Department, with priority given to drinking water and agricultural needs. 

This has resulted in significantly reduced capacity for hydroelectric power generation.

The latest data from 21 March shows varying levels of water storage across Sri Lanka’s key reservoirs. 

In the Mahaweli system, reservoirs such as GDR (Kotmale), Victoria, and Randenigala are at 69.6%, 71.6%, and 90.2% of their full capacity, respectively. 

However, others like Rantembe and Bowatenna are at critically low levels, with storage at just 37.3% and 36.1%, respectively. Notably, Moragahakanda is nearly full at 97.9%, while Kalu Ganga has already reached spill levels.

The Kelani system is facing similar issues, with Castlereagh at just 5.9% capacity and Maussakelle at 54.5%. Meanwhile, the Walawe system fares better, with Udawalawe almost at full capacity at 99.3%, while Samanalawewa remains at 54.2%. 

The irrigation system shows more favourable conditions, with several reservoirs such as Rajangana, Tissa Wewa, Hurulu Wewa, and Giritale nearly at full capacity.

Despite these mixed conditions, many reservoirs have already opened their spill gates to maintain water levels.

In the meantime, as per statistics, the CEB continues to rely on thermal power generation to compensate for the low hydro generation. 

As per the night peak data on 21 March, the CEB thermal coal plants generated 816.7 MW of active power, while CEB thermal oil contributed 332.2 MW. Additionally, wind and small hydro plants provided smaller amounts of power.