. >> we've headed a few kilometers upstream with engineer thabiso kolane.t 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 follows the area's natural slope and therefore saves energy. to follow the water's path, a car has to cover twice the distance above ground. this is where tjabane tjabane works. he's a shift foreman at the muela hydropower plant. the plant operates 24 hours a day to keep lesotho supplied with electricity. tjabane does rounds every day, checking the huge turbine halls where the generators are powered. it's warm and damp down here. lesotho relies almost exclusively on clean hydropower - completely