That depends on what kind of person you are. Whenever I hear one of these dire warnings of impending doom I ask myself if there's anything I can do about it by way of preparation. If there is I do it, and if there isn't I let it fade into the background, and get on with life. With luck there'll be no disaster, but if there is, and there's no warning I'll react to it when it happens.
As far as the 2012 solar flare storm prediction is concerned, it's just that - a prediction. There's no real evidence to suggest that the sun is going to produce flares on a scale that would knock out the world's power grids.
Here's a prediction from me:
2012 will come and go, and the human race and all its power grids will be just fine. If I'm wrong you'll have no way of telling me.