Toll road giant Transurban has declared there would be no shortage of projects in Australia and offshore to fuel its future expansion as it brushed off concerns its size was becoming a competition issue.

Revealing a 102.5 per cent jump in net profit off the back off higher road user fees, Transurban chief executive Scott Charlton on Tuesday dismissed concerns that the competition watchdog could put an end to its domestic expansion and talked down the stakes at play in its bid for majority ownership of Sydney's WestConnex motorway.

Transurban's net profit has more than doubled. Credit:Justin McManus

The Australian Competition and Consumer Commission is mulling whether to allow Transurban to buy 51 per cent of WestConnex, and has raised concerns it could make Transurban too powerful when bidding for future projects in NSW.

"We’re confident that we can get through the process and get approval. And we’re confident that with or without WestConnex we can participate with toll road processes in the future,” Mr Charlton said.