ISLAMABAD -  The share of hydel power, in the national electricity mix, is likely to further decrease after reduction in release of water by Indus River System Authority (Irsa) from Tarbela reservoir by 24,000 cusecs.

The Irsa will also reduce outflow from Mangla by 35,000 cusecs soon.

Due to lower demand in Rabi, the provinces have slashed their intents of water and resultantly the Irsa has reduced the water releases from Tarbela reservoir and will start reduction from Mangla reservoir soon, official sources told The Nation here Monday.

Sindh has reduced its demand from 70,000 cusecs to 60,000 cusecs. Similarly, Punjab reduced its intake from Taunsa to 5,000 cusecs from 24,000 cusecs, the official said.

Punjab has also informed the Irsa to reduce water from Mangla as it is going to close some of its canals. Following the decrease in provinces demand, Irsa has ordered water releases from Tarbela to be decreased from 79,000 to 55,000 cusecs and now the water release from Mangla will also be decreased from 45,000 to 10,000 cusecs. According to Punjab demand, the releases from Mangla will be low till 18 October, the official said.

The decrease of water will result in decrease of hydel power generation . As of Monday, the total peak-time hydel generation from Tarbela and Mangla was 5,750Megawatt (MW) while the average generation was less than 4,000MW, an official source said. Tarbela power plant was generating electricity upto 2,800MW while generation from Mangla was 1,115MW.

For generation of 3,475MW power, Tarbela’s full capacity, release of 1,10,000 cusec water is required while for the full capacity power generation from Mangla (1,115MW) releases of 45,000 cusecs water is needed, the official said.

Water decrease from Tarbela has already reduced the power generation while the decrease in outflow from Mangla will further decrease the share of hydel power, the official said. However the official said that power generation is related to the dam level and not with the releases from the reservoir. If the dam level is high then it is possible to generate more power with less releases. On the other hand if the dam level is low, more releases can generate less electricity, the official explained.

Due to prolonged summer the gap between demand and supply still hovers above 4,000MW. On Monday, the total demand was 16,800MW while the generation was less than 13,000MW, the official said.

As of Monday the water level in Tarbela was 1,508 feet and the inflows of water were 53,700 cusecs while the releases were 55,000 cusecs. The Mangla level was 1201.85 feet and water inflow was 10,600 cusecs while outflows were 45,000 cusecs.