Nam Pagnou river is the 1st graded branch on the right bank of Sekaman rivre and is the 2nd graded branch of Sekong river. It is expected tolocate on Nam PaGnou river in the vicinity of Dakchung District, Sekong province. Dam site will beconstructed at location where is about 7 Km far from Vietnam- Laos border into the west, 65 Kmfrom Sekong Province into the northeast by Air line or about 100 Km in the route. And 20 Km farfrom Sekaman 3 Damsite on the upstream side by waterway.It is geographical coordinates arewithin:15°32'12" Northern Latitude and 107°18'26" longitudeThe catchment area of Nam Pagnou at dam site is 446.5 Km2. Normal water level is 1064 m anddead water level is 1053 m. Area of reservoir surface confirming to NWL is 2.53 Km2.Installed capacity : 33 MWAnnual average energy output : E0 = 135.09 x 106 KWhTurbine type : FrancisNumber of units : Z = 2 unitsFIRR : 11.07%EIRR : 13.57 % Payback period : 15-16 yearsTotal investment cost estimate : 49.827 Million USD