The government are about to introduce feed-in tariffs as an incentive to support micro-generation projects. The idea is that they will provide a guaranteed, fixed subsidy for power - a much simpler proposition than the Renewables Obligation which we have at the moment.
http://www.decc.gov.uk/en/content/cms/w ... rriff.aspx
It is targeted at very small generation - in homes, farms or small businesses. The price depends on the technology, to me the winners are biomass and photovoltaics (PV). PV is the one that will "fit in" in many domestic situations - unfortunately it costs a bomb! However the feed-in tariff is designed to give a return on investment of between 5% and 8% - enough to finance that bomb I mentioned!
You'll still need a bob or two, and have the right kind of home in the right place. But owning your own power station should be a far more viable proposition in future.