IBM Power 780 Technical Overview And Introduction page 31

Feature Description
code
FC 7951 On/Off Processor Enablement:
This feature can be ordered to enable your server for On/Off capacity
on demand. After it is enabled, you can request processors on a
temporary basis. You must sign an On/Off Capacity on Demand
contract before you order this feature.
Note: To renew this feature after the allowed 360 processor days have
been used, this feature must be removed from the system configuration
file and reordered by placing an MES order.
OS
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Chapter 1. General description
17