[WillowTheWhisp]

Originally Posted by Gayle

What they're saying is that the normal cost of the energy bills is x, the cost of the energy bill plus the cost of the windmills is y and y is £13,250 less than x spread over 10 years.

I'm more confused now Gayle. Where did the 10 years come into it?

Unfortunately we don't know the normal cost of the bills all we do know is the claim that the bills will be cut by £13,250 per year.
The windmills cost £147,000 each.
Three of them will cost £441,000

So, are you working backwards with those figures and a 25 year plan? They would have to reduce the bill by an actual £30,890 per year over 25 years or £57,350 per year over 10 years to make a net saving of £13,250 per year and that's still not taking into account any maintenance costs.