'It is bigger than an A 380 and weighs more than 138 elephants.'
'It', of course is not defined.
Other reports state that the convoy (of about 6 prime movers and the transporter with a squillion wheels) is about 108 metres long and the generator weighs 256 tonnes. An A 380 measures 73 metres so I imagine that a media error of about 32 % is good enough in this day and age.
As for the elephants I have no idea.