HVDC Transmission
300-400 MW ±320 kV VSC HVDC submarine cable: 181 km from Bungus Bay (Padang mainland geothermal hub) to SE Siberut island distribution. Delivered in two phases matching geothermal rollout. 97% transmission efficiency, zero technical losses over distance.
Connecting Geothermal to the Islands: Phased Transmission
The Padang geothermal plant (540-665 MW total) sits on mainland West Sumatra, 181 km from Mentawai Islands. Rather than rely on global supply chains facing multi-year backlogs and rising costs, we design, manufacture, and deploy our own HVDC submarine transmission infrastructure in two phases matching geothermal rollout.
This critical infrastructure enables: grid independence for all island operations, cost-certainty for energy delivery, and de-risking through phased deployment proving each stage before scaling.
Phased Transmission Expansion (2026-2032)
Initial Transmission
Single cable validates marine installation, regulatory path, operational readiness
Capacity Expansion
Proven technology from Phase 1, operational experience guides faster deployment
Submarine Route Profile
- Origin: Bungus Bay, Padang mainland
- Destination: SE Siberut island (Mentawai)
- Total Distance: 181 km
- Cable Type: VSC-HVDC (±320 kV)
- Marine Route: Bungus Bay → Mentawai Strait → Siberut
Transmission Performance
- Transmission Loss: ~3% (97% efficiency)
- Voltage Class: ±320 kV VSC (Voltage Source Converter)
- Technology: Modular Multilevel Converter (MMC)
- Capacity: 300 MW (Phase 1) / 400 MW (Phase 2+)
- Design Life: 40+ years
Integration in the Ecosystem
- › Geothermal Plant (540-665 MW power source)
- › Industrial Manufacturing Hub (Manufacturing capability, copper production)
- › Geothermal Transmission (Primary 300-400 MW link)
- › Island Distribution Network (Power to all Mentawai operations)
- › Regional Exports (HVDC cables for SE Asia archipelago)
Explore the Full Ecosystem
See how HVDC transmission powers all island operations and connects the ecosystem together.