"The day was very good, we have seen that the number of people registered (in that voting center) is the number of people participating in the elections," said Maria de la Fe (no last name given), a worker of a polling station in Malabo.
According to some members of the voting center, the day was calm and without incidents, with a high participation of people in the elections, while the opposition has suggested voting irregularities.
Andres Esono told journalists that his party had been receiving complaints all day from across the Central African nation, with many voters saying they were forced to cast ballots publicly rather than in secret.
Esono was one of only two candidates running against Obiang in Sunday's election.
The other was Buenaventura Monsuy Asumu, from the Social Democrat Coalition Party, that in the past was an ally of the government.
Fourteen of the seventeen country's opposition parties joined an alliance with the PDGE (Democratic Party of Equatorial Guinea) which candidate is Obiang, accused of leading an authoritarian regime that his critics have long accused of intimidation, torture and corruption.
The incumbent president expressed optimism about the election's outcome after voting alongside his wife, Constancia Mangue de Obiang.
In previous elections Obiang has never received less than 90% of the vote, and one of the two opposition candidates said Sunday that the ruling party appeared to be again committing electoral fraud.
The final results of the presidential, legislative and municipal elections that took place on Sunday are expected to be announced in the coming days.
Despite its oil and gas riches, Equatorial Guinea has a dramatic gap between its privileged ruling class and much of the population, which lives mainly on subsistence farming.
The Obiang family has long been accused of living in opulence and using money from state coffers to fund their lifestyle.