The firm had previously used Bell Pottinger for aspects of its group-level corporate PR before moving to unify its comms accounts.
The team will be led by Nick Bastin, director, out of London and Kate Delahunty, MD MENA, out of Dubai.
TAQA is majority owned by the Abu Dhabi government and is listed on the Abu Dhabi Securities Exchange.
The firm has built a vast portfolio worth US$23.4bn and is the 6th largest independent power producer in the world.
Capital held off most of the region’s top names in financial PR to secure the potentially lucrative account.
Capital had held its investor relations brief since 2007, when the wider MSL Group won a similar international comms brief with the firm.
TAQA’s activities include oil and gas, power generation and water desalination across five continents. It produces almost 137,000 barrels of oil equivalent per day in the North Sea and North America and owns power plants in the UAE, Morocco, Saudi Arabia, Ghana, India, and the United States.