"This will involve an evaluation of various renewable energy...

"This will involve an evaluation of various renewable energy technologies as well as assessing the opportunity for funding from the Australian Renewable Energy Agency (ARENA).

An initial assessment by EMC has identified several viable renewable energy options, each capable of delivering clean, reliable and affordable energy to each of the TNG sites."

The mention of various renewable energy options is interesting.  Although CCE has declared that they are technology agnostics, so far only solar pv and wave energy have been the only RE types used in projects so far.

Perhaps concentrated solar power might be considered?

"The Northern Territory (NT) is among the regions in Australia and the world with the highest solar radiation intensities. The NT has many mine sites which consume significant amount of fossil fuel with consequent greenhouse gas (GHG) emissions. The environmental concern related to the fossil fuel consumption and availability of immense solar energy resource in the NT open the possibilities for considering the provision of power to the mining sites using proven solar technologies. Concentrating solar power (CSP) systems are deemed as the potential alternatives to current fossil fuel based generating systems in mining industry in the NT. The finding is based on consideration of the major factors in determining the feasibility of CSP system installation, with particular reference to the NT mine sites. These are plant design requirements, climatic, environmental, and other requirements, and capital and operating costs. Based on these factors, four mine sites have been identified as having the potential for CSP plants installation. These are McArthur River Mine, Ranger Mine, Northern Territory Gold Mines, and Tanami Operations. Each site could be served by one CSP plant to cater for the needs of mining operation and the local communities."

https://www.hindawi.com/journals/jse/2015/617356/