I think it's a bit silly to hit North Sea gas companies with a 'windfall' tax when around 50% of gas in the UK is imported.
There again I'm not a politician and know nothing about how these things work.
What I have seen over the past 25 years though, is a massive change in automatic machinery doing the work that used to be done by hand, which has driven up the demand and consumption of energy.
Rising population, and housing for them, also drives up demand which, IMO, is more than we can provide by solar and wind power.
Just the price of progress I guess
