"We must unite now more than ever," Guaido said at a Caracas university. "We must mount the biggest demonstration so far to reject what's happening."
Since a massive power failure struck March 7, the nation has experienced near-daily blackouts and a breakdown in critical services such as running water and public transportation.
Classes have been intermittently suspended for nearly a week, while workdays tend to end in the early afternoon so millions aren't stranded due to cuts to the Caracas metro service.
At the same time, frustrated residents are increasingly unable to find water, make phone calls or access the internet. Millions of Venezuelans struggle to understand an announcement by Maduro a day earlier that the nation's electricity is being rationed to combat daily blackouts.
Maduro said that he was instituting a 30-day plan that would balance generation and transmission with consumption. He also called on Venezuelans to stay calm, but provided no further details.
- AP