CSIRO's GenCost report needs some careful scrutiny
But it is a sunk cost by 2030. The resources will have been consumed and the facilities built. It is up to us as a society to say that we value reduced emissions, which the sunk cost facilitates. The cost to build the existing coal power stations is also sunk, but that cost is feeding emissions. As we don't price the climate into our power bills, we have to make a 'judgment' to build the infrastructure that will deliver the future we want. Once built, future generations will benefit from the fact that we devoted resources to the new infrastructure, rather than something else.
I struggle with the notion of sunk costs.
Our grid that tax payers financed was sold to privateers. They borrowed to fund that purchase. That funding incurs an ongoing finance cost that we pay on our electricity bills as a network charge. Money leaves my wallet - how is this a sunk cost?