At the time of dam construction, these tunnels were used to divert the Indus River water. On the right side of the main dam, a hydroelectric power plant houses fourteen generators fed with water from outlet tunnels 1,2 and 3. Total generating capacity of these three tunnels is 3,478 MW. On tunnel 1there are four 175 MW generators, on tunnel 2 there are six 175 MW generators and on tunnel 3 there are four 432 MW generators.