From PowuaWiki

[edit] Powua Credits

A Powua Credit is equal to the use of a CPU for 1 hour.

To reserve your cluster with Powua, you need some credits. Once you got some Powua Credits can reserve: CPUs and hours to use Powua. A Powua Credit is equal to the use of a Standard CPU for 1 hour.

[edit] How to add credits

Using your preferred browser:

• Linux using Firefox
• Windows using Internet Explorer
• Macintosh using Safari

[edit] Reservation

After you added some Powua Credits, go to reserve your cluster.