Ann: 50MW Solar Project Revenue Update, page-8

The referenced article states:

Kidston has obtained finance on the basis of a long term PPA to sell power to the QLD Govt for $70 per MWh. Clearly their cost of production must be less than this to pay operational and finance costs, otherwise they would not have been able to get finance. Therefore cost of generation is almost certainly not significantly more than $50 per MWh as cited by the ARENA chief.

So I think Kidston's cost of generation is competitive with current utility-scale solar costs.