Indonesia’s Electricity Systems – Jawa-Madura-Bali System

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)
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.

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