It does not really matter what its costs to produce in respect to reducing heating bill.
It will be sold for what can be sold at even if came out the ground for free (which of course would be impossible). It will make a margin difference depending on the infrastructure to move it. The less mobile, the greater disparity could be created in local market so could in theory reduce prices? If was completely mobile would make almost no difference as would only increase world supply by such a small amount would barley impact in price and people all around the world would share this small reduction in price even though the people near it suffered most of the costs, the externality pollution.
The benefits that shale may provide is some employment, the disadvantages environment and possibly losses some incomes.
The profits will go to international companies that may or may not pay a lot of tax on its profit in the UK. There will be tax and duty benefits for the UK.
In terms of reduced bills for heating, if the governments reduced tax, or the privately collected “taxes” the government mandate. The charges on heating are in effect tax and spend, as its mandated what collected for and mandated what spent on. Its get around rules on tax and spend but for all intends purposes is the same.
Unless the shale gave is very immobile, then don’t see much in way of savings. If the governments wanted the government would reduce their charges in domestic energy
I remember when being unemployed 8 years ago and being surprised that I had to pay extra charge on my electricity to go people that were better of. That’s administrations for you.
There may be winners and losers, but more of the winners will be external to Scotland. Mps and people like these things as can give favours from things, in deferred favours or also get a favour exchange get a favour at later date in a different thing so could swap it for a contract job or favour in completed unrelated thing on the favour 600 index-)
In respect to Scotland using more energy than it produces I am not sure this is the case. So even if we applied a frame that suggested each area should be energy sufficient, Scotland would not need to justify shale. The frame that Scotland should produce as much energy as uses we do not apply to cars electronics or other manufactured goods that produce pollution.
Even if we apply the frame about off shoring (to other countries) dirty activity in energy this not the case if we include North Sea.