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LAHORE: The Water and Power Development Authority (Wapda) said on Monday that Tarbela Dam had released more than 419 million acre-feet of stored water for irrigation and added 586 billion units of clean, low-cost electricity to the national grid over the past 50 years.

The information was shared during a briefing to Wapda Chairman retired Lt Gen Muhammad Saeed during his visit to the Tarbela Dam and Khanpur Dam fourth and fifth extension projects.

Officials said the dam had provided economic benefits worth $460 billion to Pakistan since 1974.

During the day-long visit, the Wapda chairman reviewed progress on the under-construction Tarbela Fifth Extension Hydropower Project and witnessed the testing and commissioning of the low-level outlet of the Tarbela Fourth Extension Hydr­opower Project.