The new arrival who just got keys: activation and the first-week walk-through
Power does not follow the tenancy contract automatically. In Dubai you activate a DEWA account against your Ejari; in Abu Dhabi it is ADDC (or AADC in Al Ain) against your Tawtheeq; Sharjah runs through SEWA; and Ajman, Umm Al Quwain, Ras Al Khaimah and Fujairah are served by Etihad Water and Electricity. All require a refundable security deposit, higher for villas than flats, and most activations are same-day or next-day once documents are in order.
One more new-arrival trap: the UAE runs on 220–240V with British-style BS 1363 three-pin sockets. Appliances from the UK, Europe or most of Asia are fine with at most a plug change. North American 110V appliances are not; they need a step-down transformer or they will die quickly, sometimes taking the circuit with them. Loose universal adapters carrying heavy loads like kettles or heaters are a genuine fire risk and worth replacing with proper plugs in the first week.