Continental 2-pin plugs fit into most sockets in Indonesia, although they may need a bit of a push. Most places use 220 volt current, but some places use 110 volts. Power failures or disruptions are quite common. Hotels usually have a supply of candles or oil-lamps for such occasions, but it is useful to bring a good torch, especially for when you are out walking in the evening or at night. If the street lighting fails, the many holes, bumps and ditches in the road can cause nasty surprises in the dark.