Original sentence: Browns Ferry was TVA's first nuclear power plant, and the largest in the world when it began operation.Unit One is a 1,065 MWe BWR built by General Electric which originally came online on December 20 1973, and is licensed to operate through December 20, 2033
Edited sentence: At the time of its initial operation, it was the largest nuclear plant in the world.Browns Ferry was TVA's first nuclear power plant; its approval occurred on June 17, 1966 and construction began in September of the same year.Construction started on Unit One September 12, 1966 and originally came online on December 20, 1973.It is licensed to operate through December 20, 2033.Unit One is a 1,065 MWe BWR built by General Electric