Just think of the cost of electricity if we keep investing in wind farm technology. It'll probably cost you a fiver to put the kettle on and a tenner to bake something in the oven.
Just think of the cost of electricity if we don't invest in something .... ah, sorry, there won't be any electricity.
It's easy to mock and pour scorn, but where is the future power generation going to come from if these things aren't developed and tried out now? Edison famously tried and rejected hundreds of different designs of light bulb before hitting on the one that worked. That's what R&D is all about.
Whatever means of generation is produced for the future it may well cost a fiver to boil the kettle. Just because we've had cheap power for the past few years (and we've had electricity to every home for barely 60 years out of the past several thousand) doesn't mean we're entitled to it for ever.
PJ