diff --git a/nova/tests/unit/virt/ironic/test_driver.py b/nova/tests/unit/virt/ironic/test_driver.py
index 97b4fc4cda41..736eac24ca90 100644
--- a/nova/tests/unit/virt/ironic/test_driver.py
+++ b/nova/tests/unit/virt/ironic/test_driver.py
@@ -1823,7 +1823,7 @@ class IronicDriverTestCase(test.NoDBTestCase):
         instance = fake_instance.fake_instance_obj(self.ctx, node=node.id)
         self.driver.reboot(self.ctx, instance, None, 'HARD')
         self.mock_conn.set_node_power_state.assert_called_once_with(
-            node.id, 'reboot',
+            node.id, _node.PowerAction.REBOOT,
         )
 
     @mock.patch.object(ironic_driver.IronicDriver,
@@ -1858,7 +1858,7 @@ class IronicDriverTestCase(test.NoDBTestCase):
         instance = fake_instance.fake_instance_obj(self.ctx, node=node.id)
         self.driver.reboot(self.ctx, instance, None, 'SOFT')
         self.mock_conn.set_node_power_state.assert_called_once_with(
-            node.id, 'soft reboot',
+            node.id, _node.PowerAction.SOFT_REBOOT,
         )
 
     @mock.patch.object(loopingcall, 'FixedIntervalLoopingCall')
@@ -1878,8 +1878,8 @@ class IronicDriverTestCase(test.NoDBTestCase):
         self.driver.reboot(self.ctx, instance, None, 'SOFT')
         self.mock_conn.set_node_power_state.assert_has_calls(
             [
-                mock.call(node.id, 'soft reboot'),
-                mock.call(node.id, 'reboot'),
+                mock.call(node.id, _node.PowerAction.SOFT_REBOOT),
+                mock.call(node.id, _node.PowerAction.REBOOT),
             ]
         )
 
@@ -1916,7 +1916,7 @@ class IronicDriverTestCase(test.NoDBTestCase):
         )
 
         self.mock_conn.set_node_power_state.assert_called_once_with(
-            node.id, 'power on',
+            node.id, _node.PowerAction.POWER_ON,
         )
 
     @mock.patch.object(loopingcall, 'FixedIntervalLoopingCall')
@@ -1937,7 +1937,7 @@ class IronicDriverTestCase(test.NoDBTestCase):
         self._test_power_off()
 
         self.mock_conn.set_node_power_state.assert_called_once_with(
-            node.id, 'power off',
+            node.id, _node.PowerAction.POWER_OFF,
         )
 
     @mock.patch.object(ironic_driver.IronicDriver,
@@ -1950,7 +1950,7 @@ class IronicDriverTestCase(test.NoDBTestCase):
         self._test_power_off(timeout=30)
 
         self.mock_conn.set_node_power_state.assert_called_once_with(
-            node.id, 'soft power off', timeout=30,
+            node.id, _node.PowerAction.SOFT_POWER_OFF, timeout=30,
         )
 
     @mock.patch.object(ironic_driver.IronicDriver,
@@ -1965,8 +1965,8 @@ class IronicDriverTestCase(test.NoDBTestCase):
         self._test_power_off(timeout=30)
 
         expected_calls = [
-            mock.call(node.id, 'soft power off', timeout=30),
-            mock.call(node.id, 'power off'),
+            mock.call(node.id, _node.PowerAction.SOFT_POWER_OFF, timeout=30),
+            mock.call(node.id, _node.PowerAction.POWER_OFF),
         ]
         self.assertEqual(
             len(expected_calls),
@@ -1983,8 +1983,8 @@ class IronicDriverTestCase(test.NoDBTestCase):
         self._test_power_off(timeout=30)
 
         expected_calls = [
-            mock.call(node.id, 'soft power off', timeout=30),
-            mock.call(node.id, 'power off'),
+            mock.call(node.id, _node.PowerAction.SOFT_POWER_OFF, timeout=30),
+            mock.call(node.id, _node.PowerAction.POWER_OFF),
         ]
         self.assertEqual(
             len(expected_calls),
diff --git a/nova/virt/ironic/driver.py b/nova/virt/ironic/driver.py
index ce9e0e29063d..3af85d3bd049 100644
--- a/nova/virt/ironic/driver.py
+++ b/nova/virt/ironic/driver.py
@@ -26,6 +26,7 @@ import tempfile
 import time
 from urllib import parse as urlparse
 
+from openstack.baremetal.v1.node import PowerAction
 from openstack import exceptions as sdk_exc
 from openstack import utils as sdk_utils
 from oslo_log import log as logging
@@ -1407,7 +1408,7 @@ class IronicDriver(virt_driver.ComputeDriver):
             try:
                 self.ironic_connection.set_node_power_state(
                     node.id,
-                    'soft reboot',
+                    PowerAction.SOFT_REBOOT,
                 )
                 hard = False
             except sdk_exc.BadRequestException as exc:
@@ -1417,7 +1418,8 @@ class IronicDriver(virt_driver.ComputeDriver):
                          instance=instance)
 
         if hard:
-            self.ironic_connection.set_node_power_state(node.id, 'reboot')
+            self.ironic_connection.set_node_power_state(
+                node.id, PowerAction.REBOOT)
 
         timer = loopingcall.FixedIntervalLoopingCall(
                     self._wait_for_power_state, instance, 'reboot')
@@ -1449,7 +1451,7 @@ class IronicDriver(virt_driver.ComputeDriver):
                 # polling interval
                 self.ironic_connection.set_node_power_state(
                     node.id,
-                    'soft power off',
+                    PowerAction.SOFT_POWER_OFF,
                     timeout=timeout,
                 )
 
@@ -1481,7 +1483,8 @@ class IronicDriver(virt_driver.ComputeDriver):
                           'reason': e},
                          instance=instance)
 
-        self.ironic_connection.set_node_power_state(node.id, 'power off')
+        self.ironic_connection.set_node_power_state(
+            node.id, PowerAction.POWER_OFF)
         timer = loopingcall.FixedIntervalLoopingCall(
                     self._wait_for_power_state, instance, 'power off')
         timer.start(interval=CONF.ironic.api_retry_interval).wait()
@@ -1506,7 +1509,8 @@ class IronicDriver(virt_driver.ComputeDriver):
         """
         LOG.debug('Power on called for instance', instance=instance)
         node = self._validate_instance_and_node(instance)
-        self.ironic_connection.set_node_power_state(node.id, 'power on')
+        self.ironic_connection.set_node_power_state(
+            node.id, PowerAction.POWER_ON)
 
         timer = loopingcall.FixedIntervalLoopingCall(
                     self._wait_for_power_state, instance, 'power on')