System design and deployment timeline

The SGI Cable System represents a major domestic subsea optical infrastructure undertaking that will span approximately 6,870 kilometers across the Indonesian archipelago. Built with a 16 fiber-pair architecture and an initial design capacity of 25 Terabits per second, the system will establish interconnection between 14 primary population centers and economic zones spanning Java, Kalimantan, Sulawesi, Nusa Tenggara, Maluku, and Papua. The project is scheduled to reach Ready-for-Service status in late 2028, with wet-plant material delivery expected in September 2027. The system aims to address optical bandwidth constraints in Eastern and Central Indonesia, supporting cloud workloads, mobile broadband expansion, and generative AI processing.

Consortium structure and stakeholder roles

SGI, founded in 2000, operates as an established Indonesian subsea specialist with more than two decades of experience in Engineering, Procurement, Construction, marine surveying, permitting, and subsea cable maintenance. The SGI Cable System marks the company's transition from third-party marine service contractor to independent subsea asset owner and operator.

INET (IDX: INET), a publicly traded telecommunications infrastructure developer, holds a 60% majority equity stake in SGI following an IDR 280.4 billion capital injection scheduled for completion by September 17, 2026. The company serves as primary financial sponsor and anchor capacity purchaser, deploying the subsea trunk to expand enterprise bandwidth services, corporate ISP connections, and regional data center backhaul networks.

Surge (IDX: WIFI) operates a multi-sector digital ecosystem encompassing connectivity, media, and digital services across Indonesia. The company will leverage the SGI subsea trunk to expand its "Broadband Rakyat" initiative, extending high-speed fiber connectivity from Java to underserved residential and commercial markets in outer islands.

Weave, a strategic joint venture between Surge (51%) and NTT East (49%), serves as the primary terrestrial backbone partner. The venture integrates SGI's subsea landing facilities directly into rail-adjacent terrestrial fiber optic networks, with NTT East providing Japanese engineering, construction, and Operations & Maintenance standards to ensure international-grade reliability across onshore data transmission routes.

Technology suppliers and equipment roles

Nokia supplies advanced optical line terminals, Subsea Line Terminal Equipment, and coherent transponder platforms. The company's optical technology enables the 16 fiber pairs to deliver dynamic flex-grid channel allocation, supporting cloud interconnect and generative AI traffic scaling between regional data center nodes.

FiberHome Technologies Indonesia is contracted as the turn-key subsea wet-plant supplier, responsible for manufacturing, delivering, and testing the subsea fiber optic cables, repeaters, and submerged branching hardware by September 2027.

FiberHome's emergence as a global subsea cable manufacturer

FiberHome's selection for the 6,870 km regional build reflects broader shifts in the global subsea supply chain. The traditional wet-plant market, historically dominated by the "Big 3" (SubCom, ASN, NEC) and "Big 4" (HMN Tech), faces acute capacity bottlenecks as major legacy factories encounter multi-year production backlogs driven by Western hyperscaler demand.

Geopolitical bifurcation forcing duplicate network builds and accelerating AI data center expansion have created severe shortages of heavy cable-laying vessels and repeater manufacturing slots. Following HMN Tech's progression from regional builds to long-haul projects such as the 21,500 km PEACE cable, FiberHome Marine is systematically building its subsea credentials through stepping-stone regional repeatered systems. The BaSICS cable connecting Malaysia and Indonesia, combined with the SGI Cable System, positions FiberHome Marine alongside Xtera and Prysmian as an emerging "BIG 6" global wet-plant challenger capable of offering guaranteed manufacturing windows and dedicated installation fleet access.

Route topology and landing nodes

The SGI Cable System connects 14 strategic coastal landing points, creating a multi-island ring topology designed to bypass single chokepoint vulnerabilities.

Strategic and industrial implications

  • Decentralizing Indonesian data architecture: By delivering 25 Tbps of high-density subsea capacity directly to outer island nodes including Balikpapan, Manado, and Sorong, the system reduces national traffic dependence on Greater Jakarta and accelerates regional edge data center deployment.
  • Seamless wet-to-dry plant integration: Direct integration between SGI's wet-plant landings and Weave's NTT-backed rail-adjacent terrestrial fiber routes ensures low-latency, secure data transit from ocean floors into enterprise networks and cloud platforms.
  • Archipelagic network redundancy: The 14-node ring layout across the Java Sea, Makassar Strait, and Banda Sea provides vital route diversity, protecting local operators and enterprises against single-point submarine cable cuts caused by maritime anchoring or seismic activity.

The SGI Cable System represents a significant step in Indonesia's digital transformation. By uniting local operators (INET, SGI, Surge) with global partners (NTT East, Nokia) and an emerging "BIG 6" wet-plant supplier (FiberHome), the consortium delivers the high-density optical backbone required to power Indonesia's AI economy, cloud infrastructure, and regional connectivity through 2050.