Yes, there are electrical outlets at all of the accommodations, including mobile camps.
The electrical socket in Tanzania is the same as used in the UK (Type G). Guests from most of Europe and the USA will need an adapter. The outlets are 220 volts, so all devices that get plugged in to them need to indicate 220 volt or 110/220 volt. Most battery chargers and laptop chargers are dual voltage and accept 220 volts. Hairdryers from the USA will not work. You should bring at least one UK-style adapter for pre and post safari hotels, even though we keep many on hand to loan guests while on safari. The Grand Ruaha Safari Camp supplies all USA adapters and power strips.