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Sánchez said power was brought back online thanks to connections with France and Morocco as well as gas and hydropower sources.

India, meanwhile, has been pushing to review and modify the treaty, citing changing needs - from irrigation and drinking water to hydropower - in light of factors like climate change.

"The infrastructure India has are mostly run-of-the-river hydropower plants that do not need massive storage," said Himanshu Thakkar, a regional water resources expert with the South Asia Network on Dams, Rivers and People.

Such hydropower plants use the force of running water to spin turbines and generate electricity, without holding back large volumes of water.

The treaty requires India to share hydrological data with Pakistan - crucial for flood forecasting and planning for irrigation, hydropower and drinking water.