Nuclear power generation was at 35.7 terrawatt-hour (TWh), EDF said, compared with the same period a last year when output was hit by a high volume of outages.
Total nuclear electricity generation to date for 2018 stood at 112.9 TWh at the end of March, up 4.1 percent compared with the same period in 2017.
Nuclear accounts for over 75 percent of French electricity needs. EDF operates all 58 French nuclear reactors.