diff --git a/meta-openbmc-machines/meta-openpower/common/recipes-phosphor/occ/openpower-occ-control.bb b/meta-openbmc-machines/meta-openpower/common/recipes-phosphor/occ/openpower-occ-control.bb
index f9527f1..a113045 100644
--- a/meta-openbmc-machines/meta-openpower/common/recipes-phosphor/occ/openpower-occ-control.bb
+++ b/meta-openbmc-machines/meta-openpower/common/recipes-phosphor/occ/openpower-occ-control.bb
@@ -42,7 +42,10 @@
                phosphor-dbus-interfaces \
                "
 
-EXTRA_OECONF = "YAML_PATH=${STAGING_DATADIR_NATIVE}/${PN}"
+EXTRA_OECONF = " \
+             YAML_PATH=${STAGING_DATADIR_NATIVE}/${PN} \
+             PS_DERATING_FACTOR=${POWER_SUPPLY_DERATING_FACTOR} \
+             "
 EXTRA_OECONF_append = "${@bb.utils.contains('OBMC_MACHINE_FEATURES', 'i2c-occ', ' --enable-i2c-occ', '', d)}"
 
 OCC_ENABLE = "enable"
diff --git a/meta-openbmc-machines/meta-openpower/conf/machine/include/openpower.inc b/meta-openbmc-machines/meta-openpower/conf/machine/include/openpower.inc
index b2927d3..cbfe4fa 100644
--- a/meta-openbmc-machines/meta-openpower/conf/machine/include/openpower.inc
+++ b/meta-openbmc-machines/meta-openpower/conf/machine/include/openpower.inc
@@ -29,3 +29,6 @@
 # configuration files in the format and native sysroot location expected by
 # the openpower-occ-control build process in the native sysroot.
 PREFERRED_PROVIDER_virtual/openpower-occ-control-config-native ?= "openpower-occ-control-config-example-native"
+
+#Default value for power supply output power efficiency.
+POWER_SUPPLY_DERATING_FACTOR = "90"