diff --git a/homeassistant/components/zha/diagnostics.py b/homeassistant/components/zha/diagnostics.py
index 2e0653b47e1..966f35fe98b 100644
--- a/homeassistant/components/zha/diagnostics.py
+++ b/homeassistant/components/zha/diagnostics.py
@@ -7,6 +7,7 @@ from typing import Any
 
 from zigpy.config import CONF_NWK_EXTENDED_PAN_ID
 from zigpy.profiles import PROFILES
+from zigpy.types import Channels
 from zigpy.zcl import Cluster
 
 from homeassistant.components.diagnostics.util import async_redact_data
@@ -67,11 +68,19 @@ async def async_get_config_entry_diagnostics(
     """Return diagnostics for a config entry."""
     config: dict = hass.data[DATA_ZHA].get(DATA_ZHA_CONFIG, {})
     gateway: ZHAGateway = hass.data[DATA_ZHA][DATA_ZHA_GATEWAY]
+
+    energy_scan = await gateway.application_controller.energy_scan(
+        channels=Channels.ALL_CHANNELS, duration_exp=4, count=1
+    )
+
     return async_redact_data(
         {
             "config": config,
             "config_entry": config_entry.as_dict(),
             "application_state": shallow_asdict(gateway.application_controller.state),
+            "energy_scan": {
+                channel: 100 * energy / 255 for channel, energy in energy_scan.items()
+            },
             "versions": {
                 "bellows": version("bellows"),
                 "zigpy": version("zigpy"),
diff --git a/tests/components/zha/test_diagnostics.py b/tests/components/zha/test_diagnostics.py
index 61f855af9af..5ec555d88df 100644
--- a/tests/components/zha/test_diagnostics.py
+++ b/tests/components/zha/test_diagnostics.py
@@ -6,6 +6,7 @@ import zigpy.profiles.zha as zha
 import zigpy.zcl.clusters.security as security
 
 from homeassistant.components.diagnostics import REDACTED
+from homeassistant.components.zha.core.const import DATA_ZHA, DATA_ZHA_GATEWAY
 from homeassistant.components.zha.core.device import ZHADevice
 from homeassistant.components.zha.diagnostics import KEYS_TO_REDACT
 from homeassistant.const import Platform
@@ -62,14 +63,25 @@ async def test_diagnostics_for_config_entry(
 ) -> None:
     """Test diagnostics for config entry."""
     await zha_device_joined(zigpy_device)
-    diagnostics_data = await get_diagnostics_for_config_entry(
-        hass, hass_client, config_entry
-    )
-    assert diagnostics_data
+
+    gateway = hass.data[DATA_ZHA][DATA_ZHA_GATEWAY]
+    scan = {c: c for c in range(11, 26 + 1)}
+
+    with patch.object(gateway.application_controller, "energy_scan", return_value=scan):
+        diagnostics_data = await get_diagnostics_for_config_entry(
+            hass, hass_client, config_entry
+        )
+
     for key in CONFIG_ENTRY_DIAGNOSTICS_KEYS:
         assert key in diagnostics_data
         assert diagnostics_data[key] is not None
 
+    # Energy scan results are presented as a percentage. JSON object keys also must be
+    # strings, not integers.
+    assert diagnostics_data["energy_scan"] == {
+        str(k): 100 * v / 255 for k, v in scan.items()
+    }
+
 
 async def test_diagnostics_for_device(
     hass: HomeAssistant,