diff --git a/gen/xyz/openbmc_project/Sensor/Threshold/HardShutdown/meson.build b/gen/xyz/openbmc_project/Sensor/Threshold/HardShutdown/meson.build
new file mode 100644
index 0000000..a74101e
--- /dev/null
+++ b/gen/xyz/openbmc_project/Sensor/Threshold/HardShutdown/meson.build
@@ -0,0 +1,14 @@
+# Generated file; do not modify.
+generated_sources += custom_target(
+    'xyz/openbmc_project/Sensor/Threshold/HardShutdown__cpp'.underscorify(),
+    input: [ meson.source_root() / 'xyz/openbmc_project/Sensor/Threshold/HardShutdown.interface.yaml',  ],
+    output: [ 'server.cpp', 'server.hpp', 'client.hpp',  ],
+    command: [
+        sdbuspp_gen_meson_prog, '--command', 'cpp',
+        '--output', meson.current_build_dir(),
+        '--tool', sdbusplusplus_prog,
+        '--directory', meson.source_root(),
+        'xyz/openbmc_project/Sensor/Threshold/HardShutdown',
+    ],
+)
+
diff --git a/gen/xyz/openbmc_project/Sensor/Threshold/SoftShutdown/meson.build b/gen/xyz/openbmc_project/Sensor/Threshold/SoftShutdown/meson.build
new file mode 100644
index 0000000..8cdf4ee
--- /dev/null
+++ b/gen/xyz/openbmc_project/Sensor/Threshold/SoftShutdown/meson.build
@@ -0,0 +1,14 @@
+# Generated file; do not modify.
+generated_sources += custom_target(
+    'xyz/openbmc_project/Sensor/Threshold/SoftShutdown__cpp'.underscorify(),
+    input: [ meson.source_root() / 'xyz/openbmc_project/Sensor/Threshold/SoftShutdown.interface.yaml',  ],
+    output: [ 'server.cpp', 'server.hpp', 'client.hpp',  ],
+    command: [
+        sdbuspp_gen_meson_prog, '--command', 'cpp',
+        '--output', meson.current_build_dir(),
+        '--tool', sdbusplusplus_prog,
+        '--directory', meson.source_root(),
+        'xyz/openbmc_project/Sensor/Threshold/SoftShutdown',
+    ],
+)
+
diff --git a/gen/xyz/openbmc_project/Sensor/Threshold/meson.build b/gen/xyz/openbmc_project/Sensor/Threshold/meson.build
index 6538b48..ebc1c2e 100644
--- a/gen/xyz/openbmc_project/Sensor/Threshold/meson.build
+++ b/gen/xyz/openbmc_project/Sensor/Threshold/meson.build
@@ -27,6 +27,36 @@
     build_by_default: true,
 )
 
+subdir('HardShutdown')
+generated_others += custom_target(
+    'xyz/openbmc_project/Sensor/Threshold/HardShutdown__markdown'.underscorify(),
+    input: [ meson.source_root() / 'xyz/openbmc_project/Sensor/Threshold/HardShutdown.interface.yaml',  ],
+    output: [ 'HardShutdown.md' ],
+    command: [
+        sdbuspp_gen_meson_prog, '--command', 'markdown',
+        '--output', meson.current_build_dir(),
+        '--tool', sdbusplusplus_prog,
+        '--directory', meson.source_root(),
+        'xyz/openbmc_project/Sensor/Threshold/HardShutdown',
+    ],
+    build_by_default: true,
+)
+
+subdir('SoftShutdown')
+generated_others += custom_target(
+    'xyz/openbmc_project/Sensor/Threshold/SoftShutdown__markdown'.underscorify(),
+    input: [ meson.source_root() / 'xyz/openbmc_project/Sensor/Threshold/SoftShutdown.interface.yaml',  ],
+    output: [ 'SoftShutdown.md' ],
+    command: [
+        sdbuspp_gen_meson_prog, '--command', 'markdown',
+        '--output', meson.current_build_dir(),
+        '--tool', sdbusplusplus_prog,
+        '--directory', meson.source_root(),
+        'xyz/openbmc_project/Sensor/Threshold/SoftShutdown',
+    ],
+    build_by_default: true,
+)
+
 subdir('Warning')
 generated_others += custom_target(
     'xyz/openbmc_project/Sensor/Threshold/Warning__markdown'.underscorify(),
diff --git a/xyz/openbmc_project/Sensor/Threshold/HardShutdown.interface.yaml b/xyz/openbmc_project/Sensor/Threshold/HardShutdown.interface.yaml
new file mode 100644
index 0000000..bf6c4fd
--- /dev/null
+++ b/xyz/openbmc_project/Sensor/Threshold/HardShutdown.interface.yaml
@@ -0,0 +1,47 @@
+description: >
+
+    Implement to provide hard shutdown class sensor thresholds.  Objects
+    implementing Sensor.Threshold.HardShutdown must be instantiated in the
+    correct hierarchy within the sensors namespace.  The following sensor
+    hierarchies are recognized:
+      temperature
+      fan_tach
+      voltage
+      altitude
+      current
+      power
+      energy
+
+
+    Additionally, any object implementing Sensor.Threshold.HardShutdown must
+    also implement Sensor.Value.
+
+properties:
+    - name: HardShutdownHigh
+      type: double
+      default: NaN
+      description: >
+          The upper bound of the shutdown threshold.  A value of 'NaN' is used
+          to indicate there is no threshold of this type.
+    - name: HardShutdownLow
+      type: double
+      default: NaN
+      description: >
+          The lower bound of the shutdown threshold.  A value of 'NaN' is used
+          to indicate there is no threshold of this type.
+    - name: HardShutdownAlarmHigh
+      type: boolean
+      description: >
+          True if the sensor value has exceeded the defined bound.
+          False if the sensor value has not exceeded the defined bound.
+
+          HardShutdownAlarmHigh may be set to False to clear an alarm condition.
+          The behavior of setting HardShutdownAlarmHigh to True is undefined.
+    - name: HardShutdownAlarmLow
+      type: boolean
+      description: >
+          True if the sensor value has exceeded the defined bound.
+          False if the sensor value has not exceeded the defined bound.
+
+          HardShutdownAlarmLow may be set to False to clear an alarm condition.
+          The behavior of setting HardShutdownAlarmLow to True is undefined.
diff --git a/xyz/openbmc_project/Sensor/Threshold/SoftShutdown.interface.yaml b/xyz/openbmc_project/Sensor/Threshold/SoftShutdown.interface.yaml
new file mode 100644
index 0000000..24a4d60
--- /dev/null
+++ b/xyz/openbmc_project/Sensor/Threshold/SoftShutdown.interface.yaml
@@ -0,0 +1,46 @@
+description: >
+    Implement to provide soft shutdown class sensor thresholds.  Objects
+    implementing Sensor.Threshold.Shutdown must be instantiated in the correct
+    hierarchy within the sensors namespace.  The following sensor hierarchies
+    are recognized:
+      temperature
+      fan_tach
+      voltage
+      altitude
+      current
+      power
+      energy
+
+
+    Additionally, any object implementing Sensor.Threshold.SoftShutdown must
+    also implement Sensor.Value.
+
+properties:
+    - name: SoftShutdownHigh
+      type: double
+      default: NaN
+      description: >
+          The upper bound of the soft shutdown threshold.  A value of 'NaN' is
+          used to indicate there is no threshold of this type.
+    - name: SoftShutdownLow
+      type: double
+      default: NaN
+      description: >
+          The lower bound of the soft shutdown threshold.  A value of 'NaN' is
+          used to indicate there is no threshold of this type.
+    - name: SoftShutdownAlarmHigh
+      type: boolean
+      description: >
+          True if the sensor value has exceeded the defined bound.
+          False if the sensor value has not exceeded the defined bound.
+
+          SoftShutdownAlarmHigh may be set to False to clear an alarm condition.
+          The behavior of setting SoftShutdownAlarmHigh to True is undefined.
+    - name: SoftShutdownAlarmLow
+      type: boolean
+      description: >
+          True if the sensor value has exceeded the defined bound.
+          False if the sensor value has not exceeded the defined bound.
+
+          SoftShutdownAlarmLow may be set to False to clear an alarm condition.
+          The behavior of setting SoftShutdownAlarmLow to True is undefined.