Key centres across northern Australia would also be bolstered through 20-year strategic plans, to be developed by Infrastructure Australia. The plan for Darwin would focus on LNG and mining development, agribusiness, engineering and opportunities presented by the NBN. Townsville would capitalise on transport networks, proximity to ports, education and agriculture. Cairns would develop on its tourism, with particular attention to hospitality and the influx of large numbers of Chinese tourists. Mackay meanwhile would exploit its proximity to the "fantastic" Galilee and Bowen Basins and the great future mining potential they hold. When asked the cost of the plan, Mr Rudd said Labor was still working through the details. "What we need is the national imagination to harness the enormous agricultural potential of northern Australia," Mr Rudd said. If Labor wins, the plan will be finalised by 2014, and will be fully operational by 2018, the prime minister said. Mr Rudd said his plan for northern Australia was "concrete," while Opposition Leader Tony Abbott's plan was only to write a white paper.