The GET_POWER_CAP command is used to get the power cap of the server. For this command to parse correctly, the GET_POWER_CAP command must appear within a SERVER_INFO command block, and SERVER_INFO MODE can be set to read.
Example:
<RIBCL VERSION="2.21">
<LOGIN USER_LOGIN="adminname" PASSWORD="password">
<SERVER_INFO MODE="read">
<GET_POWER_CAP/>
</SERVER_INFO>
</LOGIN>
</RIBCL>