Emergency Electrical Config is not in itself a failure. It is an electrical configuration the crew can intentionally set in an attempt to control smoke/fumes/avionics smoke
Although setting Emerg Elec Config results in a loss of many systems, you get many of them back when you select GEN2 and EMER ELEC GEN 1 LINE on before landing, and as such that landing distance factor will not apply. You are more likely to end up landing in direct law (LDF 1.3 approx)
Note that ISIS, PFD1 and ND1 are all available.
Your scenario of "screens and lights going blank at V1" is not Emerg Elec Config, and would require multiple simultaneous failures at exactly the same time to occur.
Given the above, actual landing distance and ASDA (for the stopping portion) are not possible to compare when you dont know what failures you have. Just because screens go blank does not mean A/SKID and THR REV etc are not available and V1 is not the time to go fault finding i.e stick to what Airbus say in 3.02.10
If you are currently active on type I suggest you spend some time in the QRH.