The bidders for the US$4.2mn, one-year contract were Consorcio Proyeco Diceasa Socioambiental, Consultores Ambientales y Multiservicios, Typsa and URS Holdings.
Participants have until January 4 to submit information addressing observations to their offers.
The original process was declared void after none of the proposals fulfilled requirements.
The 330km, 500kV Chiriquí Grande-Panamá III link will cross the provinces of Bocas del Toro, Veraguas, Colón, Coclé, and Panamá, as well as the Ngäbe Buglé indigenous reserve, and initially operate at 230kV. Estimated investment reaches US$500mn.
The government plans to offer the double circuit, 900-tower project under a public-private partnership.
Meanwhile, Etesa launched bidding to increase capacity of the 316km, 230kV Veladero-San Bartolo-Llano Sánchez-El Coco-Panamá II transmission line.
The project will boost dispatch of the national interconnected system from the west of the country, home to hydropower potential.