Changes to the Opal card has seen passengers save $120 million in 12 months through "transfer discounts".

Government figures show 5.1 million commuters have pocketed a $2 saving when a passenger transfers between a bus, train or ferry.

The suburbs cashing in the most are commuters from The Ponds, with a 47 percent increase in "intermodal transfers".

There's also been significant increases in Homebush Bay (36 percent) Rydalmere (25 percent), Camden (34 percent) and Carlton (12 percent).

The NSW government says passengers have saved $120 million in transfer discounts. (AAP)

Premier Gladys Berejiklian made the announcement to mark 12 months since paper tickets were phased out from the public transport network.

"This is encouraging people to use different modes of public transport, to use public transport as a real option," Ms Berejiklian said.

"I don't know how we managed before the Opal Card, those Monday morning queues for your paper ticket."

The state opposition claimed any cost saving was a "fib" because the government had scrapped free travel after eight trips.