Most alarming, the country's shrinking glaciers threaten drinking water supplies and hydroelectric plants.

Pumped storage plants, like other hydroelectric plants, can respond to load changes within seconds.

It also follows the partial nationalisation of the electric grid in 2010, including hydroelectric plants.

A cascade of hydroelectric plants was constructed on the upper course of the river in 1948.

Hydroelectric plants are by their nature limited to operating at sites with sufficient water flow.