The Jawa-Madura-Bali (JAMALI) system is by far the largest electricity network in Indonesia, accounting for around 75% of total energy sales and 69% of total generation capacity. The JAMALI system spans the three islands Jawa, Madura and Bali, and operates with a 500kV transmission backbone.
At a Glance
| Operational systems: | Jawa Barat (JABAR) Jawa Tengah (JATENG) Jawa Timur (JATIM) Bali |
| Operating voltages: | 500kV, 150kV, 70kV, 30kV (*), 20kV, 0.4kV |
| Number of customers: | 41,675,765 |
| Peak load: | 26,646 MW |
| Installed capacity: | 35,517 MW |
| Firm capacity: | 33,055 MW |
| Maximum reserve margin at peak load: | 24.05% |
| Base Generation Cost (2016): | Banten: 866 Rp/kWh DKI Jakarta: 867 Rp/kWh Jawa Barat: 866 Rp/kWh Jawa Tengah: 868 Rp/kWh Jawa Timur: 870 Rp/kWh Bali: 881 Rp/kWh |
(*) Parts of the network around some several Dutch hydroelectric power plants still operate at 30kV, e.g. Plengan (1922), Jelok (1938), Ketenger (1939), etc
Energy Sales
| Customer Type | 2016 Energy Sales | |
| GWh | % Total | |
| Residential | 62,839 | 38.58% |
| Industry | 61,825 | 37.96% |
| Commercial | 29,335 | 18.01% |
| Social | 4,322 | 2.65% |
| Government | 2,508 | 1.54% |
| Streetlighting | 2,043 | 1.25% |
| Total | 162,872 | 100.00% |
Power Plant Fuel Mix
Fuel mix based on firm capacity as at Dec 2016:
Operational Characteristics
The system dispatcher for the JAMALI system is PLN P2B based in Gandul, Jawa Barat.
Most of the load in the JAMALI system is clustered in the west of the island around Banten, Jakarta and Jawa Barat. Jawa Tengah and Jawa Timur have an oversupply of generation relative to demand and there is typically an east-to-west power flow.
In contrast to other networks in Indonesia, the load profile in the JAMALI system is relatively flat. This is most probably due to the mixture of a pronounced daytime peak in the Jakarta subsystem (as a result of industrial and commercial loads) and evening peaks in the other subsystems.
This article is part of a series examining all of the major electricity networks in Indonesia. For more information and links to all of the articles, please refer to the overview page.