Tanzania uses 220 Volt, but you will need adapters. Most lodges and hotels have adapters available. Many accommodations out in the bush, particularly tented camps, rely on generators and solar power for electricity, and so you might not have the opportunity to charge electrical equipment from your room. In this case, you can bring your camera etc. to the bar or restaurant, and charge during dinner.
On our Safari cars you can recharge your phone and cameras with the cigarette lighter. We also have small transformers in combination with the cigarette lighters (producing 220 Volt), please let us know in advance if you would need this.
On basic camping safaris, where you stay on public campsites, you will be able to charge cameras etc. at power points in the camp, and in the safari vehicle when travelling. Again, let us know in advance if you wish to do this.
Note that for quite some months now, the main grid electricity in Tanzania has been a little unpredictable. However, the situation is improving, especially in Zanzibar.
Having said that, power cuts can happen. Most lodges and hotels have back-up generators for these instances, and it should not at all detract from your safari experience. Indeed, as stated above, most lodges and camps run on generators or solar power anyway, and so power cuts on safari should affect your trip minimally.