You can wrap this up in as much technical verbiage as you want. In a non elastic market (water distribution, electricity, etc.) you can only create monopolies or oligopolies, competition cannot play its role, and seeking profitability can only happen at the expense of the customer.
Saying that "a national program to build turbines just means losing access to global economies of scale" is true if you are a micronation, hovever even assuming that you are right, it would not be a huge problem: the inefficiencies would be contained in the British economy. Sure, maybe we would have too many civil servants running it, or whatever, but that means paying more money to british people, not bleeding subsidies to foreigh fat cats.