36-hour exercise, set to involve more than 170 countries, will be held at the UAE's Barakah nuclear power plan, some 340 kilometers from Iran's shores

State-run media publishes photo of workers at plant, although no independent journalists allowed to witness facility sending out electricity for first time

Nation's representative to IAEA hails 'historic milestone'; expert has warned of possible nuclear arms race in Middle East, says lack of crucial safety features may cause disaster

The emirates have an energy-hungry population, but there are concerns over the safety of the facility combined with worries over vulnerability of energy infrastructure in region

Barakah plant near Abu Dhabi set to provide a quarter of country's energy needs when fully operational