North Summit Hydro

Nestled in the foothills of the Annapurna range, the site office is the nerve centre of the operation. A military-protected camp holds the valley, and a dedicated bunker stores the explosives that open the rock. From this outpost, engineers coordinate every drill, every blast, and every pour of concrete.

Command hub · Explosives bunker · Army camp

Every great journey begins with a single step. Ours began here.

The supply line is open. The mountain track to the headworks is complete, and the Bailey bridge across the river now carries excavators and crews to the powerhouse. Three steel ropeway towers stand on the slope, and the cable crane has been lifted onto the line and tested, the lift that ferries cement, steel, and tools where trucks cannot climb.

Access bridge · Cable crane tested · Ropeway towers

The Nyadi has been turned aside. First-stage river diversion is complete, and the undersluice is rising in reinforcement and formwork beside the diverted channel. Desander excavation is finished, ready for the basin that will keep sediment out of the conveyance. Survey base stations and a transformer at the headworks keep the work precise and powered.

River diverted · Undersluice rising · Desander excavated

Two tunnels now tell the underground story. A drill jumbo works the horizontal face, boring the next round before the rock is supported. Excavation of the 253-metre penstock tunnel is complete. The longer headrace, 2,020 metres by design, is the live face: the inlet portal is open, and as of the August progress report 119.85 metres have been driven, with shotcrete support underway inside the inlet.

Horizontal drilling · Headrace at 119.85 m · Shotcrete support

The horizontal drive has turned, and the shaft is drilled upward through the mountain. At the end of the 253-metre penstock tunnel, the raise drill works toward daylight, with 250.55 metres of the 255-metre vertical shaft already excavated as of the August progress report. From here the water will fall 690 metres, converting the mountain's head into power.

Vertical drilling · 250.55 m of 255 m · 690m gross head

At this depth, every bolt and every brace must be flawless. There is no room for error inside a mountain.

The mountainside is no longer only an alignment. At the hydromechanical yard, fabricated penstock pipes are stacked in their hundreds, welded and waiting to be placed. Anchor Block 9 has been poured; Anchor Block 12 stands in reinforcement and curved formwork, a steel pipe already sleeved through the pour. Below, at the confluence, excavators and drill crews are opening the powerhouse foundation beside the river.

Anchor blocks · Pipe fabrication · Powerhouse excavation

Each pipe carries not just water, but the promise of light for an entire region.