Iceland did something similar in the highlands in 2002-2008, for an Alcoa smelter. Several dams in the highlands create multiple reservoirs, the water is then

Iceland did something similar in the highlands in 2002-2008, for an Alcoa smelter. Several dams in the highlands create multiple reservoirs, the water is then fed through kilometres of tunnels before it reaches a ~400m vertical penstock to the Fljótsdalur underground power station (the power station is about 40km / 25mi inland, while the smelter is on the coast)