Rogun Hydroelectric Project is located in Tajikistan on the Vakhsh River,
about 340 km upstream of the river junction with Pyanj River.
The site is located at some 110 km north east from Dushanbe, to which is connected
via the main highway M41 running from the Republic capital to Pamir, passing through
Obigarm. Rogun dam site is situated about 80 km upstream of the existing Nurek
HEPP, in a narrow and deep V-shaped valley with steep slopes on both banks (about
50°) that reaches up to 400 to 500 m above the river.
According to the design updated in 2010, the project includes a 335 m high earthfill
dam to be constructed in continuous stages, the first of which would allow starting
generating electricity with two units in temporary configuration, as well as power
generation facilities and floods control facilities. The total volume of the final dam fill
amounts at 71.4 MCM.

• Six independent power waterways, each composed by a horizontal headrace tunnel
with internal circular section of 7.5 m diameter; a vertical curve connects the tunnels
with the vertical penstock shafts with 7 m diameter.
• An underground powerhouse 220 m long, 21 m wide and almost 69 m high from
the top of the roof to the draft tube bottom, in which 6 generating units, 600 MW
each, would be housed.
• Parallel to the powerhouse hall, at some 62.5 m distance between axes,
the transformer cavern, about 200 m long and 19 m wide, with maximum height from
the top of the roof to the lower floor of almost 40 m. The transformer cavern houses
six three-phase transformers close to the wall at powerhouse side, on the opposite side
provisions are made to handle the stoplogs of the discharge tunnels, which underpass
the cavern and connect with the discharge collectors.
• 6 bus duct galleries which connect the transformers cavern with the powerhouse.
• Two cables galleries starting from the eastern side of the transformers hall and running
to south for some 700 m, and the outdoor switchyard.
• Six draft tubes which join three by three into two collectors are provided for releasing
water to the two diversion tunnels.• The downstream reach of the diversion tunnels is due to be converted to tailrace tunnels, while the upstream portion will be plugged just before the junction with the drafttubes
collectors and will be abandoned.
• The protection against floods during the various phases of the project implementation and along the operation period is provided by a system of tunnels
developing both in the right and in the left bank, namely:
• Diversion tunnels number one and two with total length of about 1,200 m, the tunnels are concrete-lined and their internal section is mostly D-shaped, 17 m high and
14 m wide along the downstream stretch of some 700 m that will be used as tailrace tunnel.
• Diversion Tunnel No. 3, some 1,600 m long, entirely located in the right bank, intake of which, at el. 1,035 masl., is located some 300 m downstream from the diversion
tunnel No. 2 entrance. The upstream stretch up to the gates chamber, about 700 m long, has an internal section of approximately 175 m2. The tunnel outlet is provided
with a chute and terminal flip bucket, located a few meters above the riverbed.
• A grout curtain around 100 m deep is set up in the foundation, prolonging the impervious core alignment within the banks. The grouting works would be carried out
from galleries excavated within the banks at regularly spaced levels over the whole dam height (6 different levels).
• Third level operation tunnel, some 1450 m long, located in the left bank, with intake at el. 1,145 masl.
• Remote spillway tunnel and operation shaft spillway, composed as follows:
– Tunnel spillway with intake at el. 1,145 masl.
– Operation shaft spillway, with an entrance equipped with three radial gates 14 m wide, elevation of sill at 1,283.5 masl., 12 m diameter.
The project includes a large number of tunnels, both permanent and temporary, and several construction adits which have been used to provide access to the
underground structures at different elevations, as well as diffrent caverns with dimentions up to 45 m in height and 20 m in width.

Since May 2016, the underground excavations of Rogun
Powerhouse complex has been mainly carried out by Khakroud Co.
In the mean time, a good portion of concrete works in
Powerhouse and Transformer caverns, D/S power waterways,
drainage shafts and other structures are completed or under
construction by Khakroud.
Among all, the following activities could be short listed:

Scope of work:

• Site Installation, Residential, Office & Workshops.
• Excavation & Rock support of units 1 to 6 of Powerhouse.
• Excavation of Transformer cavern units 1 to 6.
• Prestressed monobar anchor and tendon drilling and installation in Powerhouse & Transformer
Caverns. (more than 50 km)
• Construction of main concrete structure of Transformer Cavern Units 5 & 6 (17300 m3)
• Concrete structure in Powerhouse (4500 m3)
• Pilot excavation, Enlargement & Rock support of 30m height inclined Draft-Tube shafts 1 to 6.
• Excavation & Rock support of (75 m2 cross section) lower pressure Tunnels units 1 to 3. (230 m)
• Excavation & Rock support of (210 height) Access Tunnel to Ventilation shafts.
• Excavation & Rock support of (35 m2 cross section) Access Tunnels to Lower Pressure Tunnels.
• Pilot excavation of pressure shafts of waterway system units 2 to 6 using Raise Climber. (900 m)
• Pilot excavation, Enlargement, Rock support and Concrete lining of 66m height Drainage shaft.
• Pilot excavation, Enlargement, Rock support and Concrete lining of 160m height Venilation shaft.
• Exavation, Rock support and concrete lining of D/S waterway system of units 1, 2 & 3 of
Powerhouse. (Collector Tunnels 1, 2 & 3)Construction of more than 1000 m²  offices.