“The extent of the economic damage can be estimated in one massive sum: $1 trillion. That’s according to a recent study by specialist insurance company Lloyd’s and University of Cambridge’s Centre for Risk Studies.
The report looked at two scenarios. One where a group of terrorists or ‘disgruntled insider’ hackers break into the power system and bring 50 of the almost 700 generators in the northeastern U.S. offline, resulting in a blackout that lasts about 4 days. The damage: $243 billion in immediate and tangential economic loss.”
Source: This is how much a cybercrime blackout would cost the U.S.