The Sumatera interconnected system is the second largest electricity network in Indonesia, second only to the Jawa-Madura-Bali (JAMALI) grid, and covers the entire Sumatera mainland.
At a Glance
| Operational systems: | Sumatera Bagian Utara (SUMBAGUT) Sumatera Bagian Selatan & Tengah (SUMBAGSELTENG) |
| Operating voltages: | 275kV, 150kV, 70kV, 20kV, 0.4kV |
| Number of customers: | 17,030,853 (2016) |
| Peak load (2017): | SUMBAGUT: 2,388 MW SUMBAGSELTENG: 3,582 MW |
| Installed capacity (2017): | SUMBAGUT: 3,270 MW SUMBAGSELTENG: 5,292 MW |
| Firm capacity (2017): | SUMBAGUT: 2,399 MW SUMBAGSELTENG: 4,033 MW |
| Maximum reserve margin at peak load (2017): | SUMBAGUT: 0.46% SUMBAGSELTENG: 12.59% |
Energy Sales
| Customer Type | 2016 Energy Sales | |
| GWh | % Total | |
| Residential | 18,752 | 58.41% |
| Industry | 5,170 | 16.10% |
| Commercial | 5,296 | 16.50% |
| Social | 1,152 | 3.59% |
| Government | 632 | 1.97% |
| Streetlighting | 1,100 | 1.25% |
| Total | 32,102 | 100.00% |
Power Plant Fuel Mix
Fuel mix based on energy delivered as at Dec 2016:
Operational Characteristics
While physically one contiguous network, the Sumatera Interconnected system is actually normally operated as two separate islands due to inter-area oscillatory stability issues. The system dispatcher is PLN P3BS based in Pekanbaru, Riau.
A 275kV transmission backbone is currently being developed along the main north-south corridor of the island. At present, the main backbone is still operated at 150kV, although several 275kV sections in Sumatera Selatan, Jambi and Begkulu (S2JB) were energised at the end of 2016.
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