The state-run Brazilian company will auction some of its distribution firms on August 30 and the special purpose companies on September 27.
The launch takes place one day before the official start of the presidential campaigns ahead of the October 7 elections..
A consortium of Uruguayan, Spanish and French firms allege that its score in the evaluation process should have been higher. The process has already been stalled after to a challenge by competitor Acciona.
Spanish banking giant BBVA said it has "expressed its willingness to negotiate with the Bolivian government to produce a smooth and orderly transfer with the regulator and the authorities."