Electricite de France, the world's largest utility company, said the 58 nuclear reactors at its 19 nuclear power stations are set up now to produce 60 million kilowatt hours of electricity for French consumers for the first time since December 2004.
The linkage of the 58 reactors, EDF said, represents an "impressive industrial feat" that guarantees French consumers a reliable power source during a harsh winter season.
The French utility company said its production was 5 percent higher for peak consumption periods from December 1, 2009, through February 15, 2010, than during the previous reporting period.
This increase, the company said, represents about 4,200 megawatts of energy.
EDF, however, said "the only guarantee" of sustainable performance, was to modernize its regional production systems, which it said would cost around $4.5 million per year.