1,500 miles of high voltage transmission lines would cost a lot ($billions). Much more than the economic benefit of sharing power resources across the distinct

1,500 miles of high voltage transmission lines would cost a lot ($billions). Much more than the economic benefit of sharing power resources across the distinct markets. AEMO's National Transmission Network Development Plan [0] describes in great detail how they foresee investments in the (eastern) grid infrastructure. As a frame of reference, just upgrading a couple transformers to increase the transfer capacity between South Australia and Victoria will cost tens of millions.[1] [0] http://aemo.com.au/Electricity/Planning/National-Transmission-Network-Development-Plan http://aemo.com.au/Electricity/Planning/National-Transmissio... [1] http://www.electranet.com.au/assets/Uploads/interconnectorfeasibilitystudyfinalnetworkmodellingreport.pdf http://www.electranet.com.au/assets/Uploads/interconnectorfe...