Its four 120 MW sets were the first commissioned in Britain of what became for a time that standardised size .
The station 's first unit went into operation in December 1958 , and the A Station was fully operational by June 1960 .
station 's four 120 MW sets were the first commissioned in Britain of what became for a time that standardised size .
The station 's first unit went into operation in December 1958 , and the A Station was fully operational by June 1960 .