Solar PV microgeneration won't match grid pricing for a while: I estimate my PV-generated energy to be about 10x the cost of grid-imported energy.
On a large scale wind is already reasonably economical compared to fossil sources, and solar promises to catch up soon for one reason or another.
Microgeneration is going to stay more expensive than grid power unless you are in a remote rural area and have no practical alternative. That's effectively why we have a grid after all.
But you might want to hug a tree or you might want to give yourself some insulation against power cuts if you are in a place prone to them... Both are good non-financial reasons to consider urban (RE) microgeneration IMHO.
In South Africa right now you could be avoiding a 2-hour 'load-shedding' power cut almost every day right now up until 2013, for example, and without needing a noisy and dirty diesel generator. Or look at Eigg switching on their system at the start of the month. The £20,000 per household it cost them is roughly what I estimate it would cost me to come off the grid in urban England, with care.
Rgds
Damon