The national control centre monitors the country's electricity network.
The Central Tenders Committee did not give a reason for the retender.
Bids under the original tender were due on 30 December. The deadline for bids is now 22 March.
A pre-bid meeting will be held on 15 February.
A total of six companies were prequalified for the project. They include Germany’s Siemens, France’s Areva and Switzerland-based ABB. Three Japanese companies - Mitsubishi Corporation, Toshiba Corporation and Hitachi Zosen Corporation - were also prequalified.