We're talking about a company with $200 billion in cash lying around. They could build a few large nuclear plants without making a significant dent in that pile of money.
Residential rates appear to be reasonably high (9th highest if I read this right: http://www.eia.gov/electricity/state/) but (a) presumably they're not exactly smelting aluminum and (b) don't they have a giant money pit that Tim Cook dives in Scrooge McDuck-style.