The government-run energy investment firm currently retains Capital MS&L for investor comms and Bell Pottinger for its group level corporate comms.
The brief encompasses both Capital's retained financial comms work and Bell Pottinger's wider global remit and comms work in support of investments and transactions when they arise.
It is thought that the group is exploring the possibility of merging the two pieces of business into a single agency for reasons of efficiency, although there is no guarantee the accounts will not remain separate.
The firm is said to have asked for written submissions by the majority of the region's key PR players and is in the process of drawing up a shortlist to pitch for the accounts. It is understood Capital MS&L and
Bell Pottinger will look to defend their accounts.
Capital and the wider MS&L Group won started working with Taqa late 2007, although only Capital remains retained by the firm.
The Abu Dhabi National Energy Company is publicly listed and has built a vast portfolio worth US$23.4bn.
The firm has investments across the globe in power generation, combined heat and water, desalination, upstream oil and gas, pipelines, services and structured finance.
Taqa's aggressive expansions since its 2005 float has seen it build significant energy investments in the UAE, Morocco, Saudi Arabia, the UK, India, the Caribbean and the US.
However, this year has seen a change in strategy at the company, with a focus on ret-renchment after an overhaul of its leadership team.
Peter Barker-Homek was removed as chief executive towards the end of last year, with Carl Sheldon being promoted to general manager.
Barker-Homek subsequently sued Taqa in the US, claiming he was forced out because he 'tried to put a stop to the kickbacks, bribery, accounting fraud and corruption'.
The firm has pledged to fight what it termed 'spurious allegations'.