The last hit big was in 1858 which fried a lot of the telegraph system in the US. Fortunately their was nothing else around that was electrical. In 1987 the whole of Quebec Canada was blacked out due to a partial hit. In 2012 a large pulse barely missed the earth.
However, once it is over, we can rebuild but it may take up to 20 years. Not the end of the world but a temporary end to our lifestyles.
The only thing still working would be military grade aircraft that have EMP protection. I hope we re-build everything to that standard.