Government sold the power stations off to foreign interests.
Did they pay the money back to the taxpayer? Not on your life. The money was needed badly to meet growing Government expenditure. That's why they were sold.
Why else would a government sell off the assets of the country? How about this one - they were not depreciated and no money was set aside for replacement. As the time came for replacement they were spending money like drunken sailors so none was available to replace even basic infrastructure. So, sell the family silver - obviously.
What does the taxpayer end up owning? Not a lot.
Coming next: A last word on power generation: Dounreay