Thanks for taking us through your thought process. First, I’d challenge your initial assumption that Yirrganydji people are all located in remote Australia. I suggest you read this background section about the Yirrganydji Country to get a bigger picture of the geographical spread of the Yirrganydji people.
In the background information of Design Area 3 – Energy, we mentioned that Ergon Energy Network operates in the area. Their website has a section called: ‘Data to share‘, which you may find helpful in forecasting your energy requirements.
I hope this helps.