NBN Co chief Stephen Rue has kept his cards close to the chest on whether there will be changes to the company’s extra capacity charges after a billion-dollar earnings reversal, as tensions simmer with the broader sector over the pricing structure that some argue has depressed their profit margins.

The company – a nationalised corporation tasked to build and operate the national broadband network – booked $424 million of earnings after so-called subscriber costs in the six months to December 31, which was up significantly from a $663 million shortfall in the comparable prior period.