Voltage: Indonesia operates on 220V / 50Hz electrical system. This matches most of Europe, Asia, Africa, and Australia but differs from North America (110V) and parts of Japan (100V).
Plug Types: Indonesia primarily uses Type C and Type F European-style plugs (two round pins). Type C has two round pins without grounding. Type F has two round pins with grounding clips on sides. Many outlets accept both types plus some accept Type G (UK-style) in international hotels.
Travelers from North America: Require both an adapter (to fit plug shape) AND a voltage converter (to handle 220V). However, most modern electronics (phones, laptops, cameras, tablets) have universal power supplies (100-240V) and only need an adapter. Check device specifications: if it says "INPUT: 100-240V" you only need adapter, not converter.
Travelers from Europe/Australia/Asia: Voltage compatible (220-240V regions). European travelers usually don't need adapters. Australian/UK travelers need plug adapter (Type C/F adapter for their Type I or G plugs).
Travelers from UK: Need adapter for Type C/F plugs. Voltage compatible at 230V.
Universal Travel Adapters: Recommended purchase - accepts plugs from any country and converts to Type C/F. Available at airports, electronics stores worldwide, or Amazon before departure. Also sold in Jakarta electronics stores and hotel gift shops (often overpriced).
Jakarta's electricity generally reliable in central areas, hotels, and tourist zones. Occasional outages can occur, especially during storms or in residential areas. Power surges possible - use surge protectors for expensive electronics. Most hotels have backup generators ensuring uninterrupted service.