When it comes to Y2K disaster scenarios, one of the most common fears is the loss of electrical power. Generator sales continue at stunning levels and many people are preparing, or are already prepared to function without the electrical grid. Electrical power utilities don't have that luxury.
Electrical power is produced in real-time.
There aren't any large nuclear batteries anywhere, storing electricity for later increased demand. Electrical utilities must always be producing electricity for the existing demand. They have done very well in mastering this model. Typically, they perform this service with very few interruptions. While most of us can recall a few major incidents in which a major outage occurred, outages or brownouts are the exception rather than the rule.