Premier Dominic Perrottet has met with executives from South Korean automotive giant Hyundai to promote green hydrogen manufactured in NSW.
The NSW leader visited Seoul to sell his government's strategy involving $3 billion in incentives to commercialise supply chains for the energy source.
The global car manufacturer is a leader in hydrogen fuel cell technology, and has launched zero-emission electric vehicles.
The premier took a test drive of the firm's hydrogen-powered 10 metre-long truck Xcient around the streets of the South Korean capital.
A single 31-kilogram tank charge of hydrogen lasts up to 400 kilometres with some 50 trucks already on the road in Switzerland.
"What we see here is the future of vehicle manufacturing and hydrogen is a key part of that future," Mr Perrottet told reporters after touring Hyundai's showroom.
He is targeting a $270 billion of investment to be injected into the nascent industry as the world pushes for decarbonisation over the coming decades.
In a speech to Korean businessmen on Monday, the premier said "NSW has the resources to be a global clean energy superpower".
Last week in Japan on the first leg of his 10-day Asian trade tour, he said he wanted drivers around the world to be filling with hydrogen from NSW rather than oil from the Middle East.
Green hydrogen refers to that produced from electrolysis - splitting hydrogen from oxygen in water - using renewable electricity with zero direct emissions.
It can be used in generation, transport and heating.
Hydrogen is widely seen as critical to decarbonising industries reliant on coal, gas and oil.
The premier said his government is hoping to reduce the cost of production to $2.80 per kilogram by 2030.
Last week NSW Treasurer Matt Kean said the state, along with Victoria, would spend up to $20 million on hydrogen refuelling stations along the Hume Highway in a bid to drive down carbon emissions.