Voltage & Frequency: Indonesia operates on 220 Volts, 50 Hz electric current. This differs from North American standard (110V, 60Hz) but matches European standard (220V, 50Hz). Using incorrect voltage device causes permanent damage—verify compatibility before plugging in.
Outlet Types: Indonesia primarily uses Type C (two round pins), Type I (three angled flat pins), and increasingly Type A (two flat parallel pins). Most hotels stock multiple outlet types or provide adapter access. Plug shapes vary within Indonesia; bring universal adapter accommodating all types to ensure compatibility.
Voltage Converter vs. Adapter: Adapters change plug shape but not voltage—essential for North American devices but insufficient for electrical conversion. Converters transform 110V to 220V or vice versa—necessary for high-powered appliances (hair dryers, hot plates). For most electronics (chargers, phones, laptops), integrated power supplies accept 100-240V requiring only adapter, not converter. Check device labels for voltage acceptance range.
Power Reliability: Medan generally has reliable electricity in urban areas served by PLN (state electric company). Power outages occasionally occur (15 minutes-2 hours) during peak demand periods or after heavy rain. Backup power packs recommended for critical device charging. Hospitals, major hotels, and government buildings have backup generators.
Recommendations: Bring universal adapter (Type C priority, but universal type preferable). Most modern electronics include 100-240V power supplies—verify before departure. Heavy appliance owners consider voltage converter. Portable power banks essential for mobile charging during outages or day trips. Consider travel surge protector protecting multiple devices from voltage fluctuations.
Shopping Electronics: Medan's modern malls sell adapters and converters, though at marked-up tourist prices. Shop early in trip for local options if urgent. Quality varies; recognize potential fire hazards with substandard equipment.