OP
alarm man
Yes, supply and demand play a factor, but if supply gets too tight, prices rise, which then attracts new entrants and new investment to provide what's in short supply. Back to the old chestnut of not a big enough profit margin for companies to want to take the political risk. Only the other day, Miliband at some Labour Party party hinted at how - if he was elected - he'd give the utilities a whipping. So which utilities in their right mind would want to invest with such threats?
Have a read of this interesting article on Europe's utility companies and the cost to consumers:
The cheapest energy in Europe
it is supply and demand,keep the supply low the demand increases,therefore the price rises and the profits increase,next will be seeing the banks buying up oil and parking in it tankers offshore waiting for the price increase and as if by magic these ships head to port in the winter