This is a bad metaphor. Utility computing isn't quite up to the same level as electrical utilities. Heroku has suffered from more downtime in the past year than I have power outages. Also, most commercial operations that tap into public utilities have some sort of backup plan for when the power goes out. A dramatic example of that is the power staying on in the Goldman Sacs building during Hurricane Sandy (
http://www.inquisitr.com/381743/hurricane-sandy-rages-but-th...)
More visibility would be greatly appreciated into what you're doing behind the scenes and increase your customers' confidence and expectations of using the Heroku pg cloud service. I hope you provide more depth to future answers as opposed to, "Just trust us". I've found that in practice, things never work out that way.