This person prices it as 1.5 billion, but I know it had to be more than that. They have great capacity to hide costs, and this is why I was always hoping for a change in gov't. He attributes the flat power output to bottled up transmission, but with the pumped storage capacity maxed out, there can be no increase. That's why I call it the 'Tunnel to Nowhere".
What's a few billion amongst friends? Wait until you see that Darlington refurb. Now, that's money!