ABU DHABI, Sept 26 (Reuters) - A former executive of Abu Dhabi National Energy Company TAQA.AD (TAQA) has been appointed as director-general of the Abu Dhabi Water & Electricity Authority (Adwea), its spokesman said on Monday.

Saif Saleh al-Sayari, formerly head of energy solutions at Taqa, is the new director-general of Adwea, the state-owned utility's spokesman told Reuters.

He replaces Faris Obeid al-Dhaheri who left Adwea, he said, without giving reasons for the departure. Adwea has five subsidiaries that generate, buy, transmit and distribute water and electricity in Abu Dhabi, the capital of the United Arab Emirates.

In May, the board of Adwea was revamped and Abdullah Ali al-Ahbabi was appointed as its chairman.

(Reporting By Stanley Carvalho, editing by Louise Heavens) ((stanley.carvalho@thomsonreuters.com; + 9712 6444431; Reuters Messaging: stanley.carvalho.thomsonreuters.com@reuters.net))