The oil-rich United Arab Emirates on Thursday announced the completion of the Arab world's first nuclear power plant, calling it a "significant step".

Abu Dhabi's Barakah Nuclear Energy Plant will produce 40 terawatt-hours of electricity annually after its fourth and final reactor has entered commercial operation, the state-owned Emirates Nuclear Energy Corporation (ENEC) said in a statement.

It will generate 25 percent of the electricity needs of the hot, desert Gulf state, where air-conditioning is ubiquitous -- nearly the equivalent of New Zealand's annual consumption, ENEC said.

The station will power companies including the Abu Dhabi National Oil Company (ADNOC), one of the world's biggest oil producers, Emirates Steel and Emirates Global Aluminium, ENEC said.

Barakah, which means "blessing" in Arabic, started operations in 2020 when the first of its four reactors went into service.

Saudi Arabia, the world's top oil exporter, has also said it plans to build nuclear reactors.

Emirati President Sheikh Mohamed bin Zayed Al Nahyan hailed Barakah's completion as a "significant step on the journey towards net zero".

"We will continue to prioritise energy security and sustainability for the benefit of our nation and our people today and tomorrow," he said in a post on social media platform X.

According to the International Atomic Energy Agency, the plant "will have to be disassembled at the end of its useful life, in around 60-80 years".

The UAE, which is made up of seven emirates, including the capital Abu Dhabi and economic hub Dubai, is one of the largest oil producers in the OPEC cartel.

The country was largely built on oil but is spending billions to develop enough renewable energy to cover half of its needs by 2050.

Last year, it hosted the COP28 UN climate talks which resulted in an agreement to "transition away" from fossil fuels.

The country uses gas-powered stations for much of its electricity needs, but also has one of the world's biggest solar plants outside Abu Dhabi.