Upper Tamakoshi Hydroelectric Project (UTKHEP) is located in Tamakoshi River in Dolakha District, Janakpur Zone of Central Development Region. Tamakoshi River is one of the major tributaries of the Sunkoshi River of the Koshi basin. The project yields a maximum output of 309 MW with an estimated average annual energy production of 1,737 GWh. Among the runoff river projects investigated in Nepal, UTKHEP is one of the most attractive due to its low specific investment costs and its limited environmental impacts.

UTKHEP is a run-of-the river development with a live storage volume in the intake pond sufficient for daily peaking operation. The project exploits a gross head of 820 m on Upper Tamakoshi over an about 11 km long stretch of the river from the plain upstream of Lamabagar village to the tailrace outlet, which is located about 2 km downstream of the confluence of Gongar Khola with Tamakoshi. The intake for UTKHEP is located at Lamabagar village about 90 km north-east of Kathmandu, 6 km south of the border to China and 32 km at north to north-east of the district headquarter, Charikot. The powerhouse is underground with installation of four Pelton turbine generating units each of rated capacity 79.3 MW.

At present, the site of Access Tunnel to powerhouse is not accessible by motorable road. A fleet of construction equipment that comprised Drill Rig, Wheel loaders, Dump Trucks and Shotcrete Robot have been air lifted from Singati, which is about 16 km from the powerhouse site. Construction materials such as cement, micro silica, steel fibre, rockbolts, steel ribs etc are being transported either by mules or by porters.