Thanks for that question PT.
I am not privy to the commercially sensitive answer.
It varies every 1/2 hour according to the demand and prices offered by the generating companies.
I suspect you actually know more than I do.
What I do know is there is a fixed cost to start and run a generator at huntly and then a variable price according to the price of fuel and how much is burnt.
The demand for electricity is high ,the current spot price is very high.Hydrolakes are lower than average so more thermal generation is required.
Genesis have the most thermal generation which can meet this increased demand.
If fixed costs are say $50 and the market price is $75 profit is 25.If price is $200 profit is 6 times that figure.
I see the spot price is still over 200 so genesis should be creaming it.
I wish I knew the full answer to your question-anyone know the actual current figure?