Sounds great right? Well it is! Did you know you could buy all the servers with the cost of your system room's or data center's power consumption? I think this is a lot!....
Enabling the cloud is one step forward of the virtualization. With the virtualization, you can save from the hardware resources. But virtualization is still somewhere between hardware and operating system. It's has no clue what's turning around up there in the application layer.
Yes, cloud gives you the control of the application layer.
You can scale up, shape up, extend or shrink on the go.
Then, you can be more green by saving lots of energy by utilizing enough resources at the right time.