The humanitarian network can start distributing assistance to an estimated 650,000 people in the South American country in around 15 days.
"If the US go in,it'll be three days. If the Colombians go in,maybe a week,"said retired colonel José Machillanda.
The power blackout is the latest calamity to befall a country in seemingly perpetual crisis.
The nationwide power failure has intensified pressure on President Nicolas Maduro,who appeared in public on Saturday for the first time since the country plunged into darkness.
An electrical outage has left much of Venezuela without power in what authorities are decrying as an act of"sabotage."
Guaido tweeted that Venezuelans should monitor his official announcements and that he would provide details about meeting points for supporters
Juan Guaido,who is trying to build international pressure to oust President Nicolas Maduro,did not comment on the timing of his planned return to Venezuela
Venezuela is in chaos as rival rulers face off with another. Other nations are weighing in too. How did it come to this?
President Nicolas Maduro just shrugged off the biggest challenge to his power since Juan Guaido declared himself interim leader. Now Guaido needs a Plan B.
US Vice President Mike Pence is set to announce"concrete steps"and"clear actions"to address the Venezuela crisis when he meets regional leaders.
The Trump administration and the Venezuelan opposition have staked their plans to weaken President Nicolás Maduro on a climactic moment only days away.