. >> lieketseng mothibi also works for the company that operates the katse dam.ater is one of lesotho's most important exports and a lucrative one too. >> the main benefits could be those ones that we are generating electricity for the whole nation before this water being transferred to south africa. and again there are some royalties that come to lesotho as a result of water transferred water to gauteng province south africa. lesotho would get an average of 13 million maluti on a monthly basis. >> we've headed a few kilometers upstream with engineer thabiso kolane. at the entrance to a one- kilometer-long tunnel system, he tells us about one of the project's most impressive features. >> this is the intake tower. this is actually the place where the water transfer starts from. the intake tower is about 100 meters tall. below us there is a tunnel which connects the lake with muela hydro power. that is where we generate electricity 72 megawatts for the country. >> the water flows 60 kilometers through the tunnel that sluices through the mountains. the system follow