Talk about pre-empting fate - I was given this very emergency in the A320 sim a couple of days ago! At 120kts, it all went dark and I elected to stop. It wasn't pretty and I did go off the runway - but we stopped without hitting anything. A mate got the same at 130kts and continued. Getting airborne hoping the RAT is going to kick in 7 seconds after take off takes balls, but it worked for him and he managed to land in the electrical emergency configuration.
Still pretty unlikely in real life though.