Hmmm I suppose I can justify spending work time hanging out on this forum if I answer a work related thread ;)
Al - you are of course correct - the greenest power is the power you never use.
However, let's say (for example) you find it hard to turn off the computer and refrain from sharing your views, opinion and wit on internet forums (as I do), despite the environmental benefits of not doing so... how can we make a difference?
The current situation with the homogeneous national grid(s) in the UK is that there are no *real* incentives for energy companies to change the way they generate electricity (or gas).
Of course they would rather use the cheapest means of generating, thereby creating the biggest margins, and therefore dividends for their shareholders (individuals or corporates like pension funds), that's business. The fact is that the environmental cost of this cheap energy production is hidden - or at least postponed till a later environmental disaster...
Paying more for green energy that doesn't actually help change the way the energy is produced *is* a waste of money.
Most 'green' tariffs are not about changing the way energy is made in the UK - they are, as you suspected, about getting people to pay more for something that already happens, with the lure of the warm fuzzies as reward. The legal requirements for renewables in the mix, the ROCs and all that stuff is what
has us alongside Luxembourg and Malta in terms of our renewable energy capacity in the mix. We are miles behind.
That's why I believe in what Ecotricity are doing - it's a not-for-profit with a mission to change the way energy (not just leccy any more) is made in the UK.
End of shop talk... which brings me nicely up to hometime :D