(Bloomberg) -- Electricite de France SA connected a new nuclear reactor to the French power grid for the first time in a quarter century on Saturday, adding low-carbon electricity supply at a time when a sputtering economy has made demand sluggish.Most Read from BloombergReviving a Little-Known Modernist Landmark in Buffalo The Architects Who Built Miami Ho Chi Minh City Opens First Metro Line After Years of Delay New York’s Congestion Pricing Plan Still Faces Legal Hurdles New York City’s Histo...