diff --git a/homeassistant/components/forecast_solar/diagnostics.py b/homeassistant/components/forecast_solar/diagnostics.py
index 7fdcd22d0fc..d14136103a4 100644
--- a/homeassistant/components/forecast_solar/diagnostics.py
+++ b/homeassistant/components/forecast_solar/diagnostics.py
@@ -45,9 +45,9 @@ async def async_get_config_entry_diagnostics(
                 wh_datetime.isoformat(): wh_value
                 for wh_datetime, wh_value in coordinator.data.wh_days.items()
             },
-            "wh_hours": {
+            "wh_period": {
                 wh_datetime.isoformat(): wh_value
-                for wh_datetime, wh_value in coordinator.data.wh_hours.items()
+                for wh_datetime, wh_value in coordinator.data.wh_period.items()
             },
         },
         "account": {
diff --git a/homeassistant/components/forecast_solar/energy.py b/homeassistant/components/forecast_solar/energy.py
index 33537396330..b2e9b51473b 100644
--- a/homeassistant/components/forecast_solar/energy.py
+++ b/homeassistant/components/forecast_solar/energy.py
@@ -16,6 +16,6 @@ async def async_get_solar_forecast(
     return {
         "wh_hours": {
             timestamp.isoformat(): val
-            for timestamp, val in coordinator.data.wh_hours.items()
+            for timestamp, val in coordinator.data.wh_period.items()
         }
     }
diff --git a/homeassistant/components/forecast_solar/manifest.json b/homeassistant/components/forecast_solar/manifest.json
index 0b9abb5f45c..ac6a3f7c308 100644
--- a/homeassistant/components/forecast_solar/manifest.json
+++ b/homeassistant/components/forecast_solar/manifest.json
@@ -7,5 +7,5 @@
   "integration_type": "service",
   "iot_class": "cloud_polling",
   "quality_scale": "platinum",
-  "requirements": ["forecast_solar==2.2.0"]
+  "requirements": ["forecast_solar==3.0.0"]
 }
diff --git a/requirements_all.txt b/requirements_all.txt
index 4c110a17359..3ff2d210c5e 100644
--- a/requirements_all.txt
+++ b/requirements_all.txt
@@ -739,7 +739,7 @@ fnv-hash-fast==0.3.1
 foobot_async==1.0.0
 
 # homeassistant.components.forecast_solar
-forecast_solar==2.2.0
+forecast_solar==3.0.0
 
 # homeassistant.components.fortios
 fortiosapi==1.0.5
diff --git a/requirements_test_all.txt b/requirements_test_all.txt
index a62514a4525..0a30ddeb364 100644
--- a/requirements_test_all.txt
+++ b/requirements_test_all.txt
@@ -570,7 +570,7 @@ fnv-hash-fast==0.3.1
 foobot_async==1.0.0
 
 # homeassistant.components.forecast_solar
-forecast_solar==2.2.0
+forecast_solar==3.0.0
 
 # homeassistant.components.freebox
 freebox-api==1.1.0
diff --git a/tests/components/forecast_solar/conftest.py b/tests/components/forecast_solar/conftest.py
index 007a6b7d2ae..26c1ae7ba36 100644
--- a/tests/components/forecast_solar/conftest.py
+++ b/tests/components/forecast_solar/conftest.py
@@ -99,7 +99,7 @@ def mock_forecast_solar(hass) -> Generator[None, MagicMock, None]:
             datetime(2021, 6, 27, 13, 0, tzinfo=dt_util.DEFAULT_TIME_ZONE): 20,
             datetime(2022, 6, 27, 13, 0, tzinfo=dt_util.DEFAULT_TIME_ZONE): 200,
         }
-        estimate.wh_hours = {
+        estimate.wh_period = {
             datetime(2021, 6, 27, 13, 0, tzinfo=dt_util.DEFAULT_TIME_ZONE): 30,
             datetime(2022, 6, 27, 13, 0, tzinfo=dt_util.DEFAULT_TIME_ZONE): 300,
         }
diff --git a/tests/components/forecast_solar/test_diagnostics.py b/tests/components/forecast_solar/test_diagnostics.py
index 6bb4c3c5780..4ef25379497 100644
--- a/tests/components/forecast_solar/test_diagnostics.py
+++ b/tests/components/forecast_solar/test_diagnostics.py
@@ -45,7 +45,7 @@ async def test_diagnostics(
                 "2021-06-27T13:00:00-07:00": 20,
                 "2022-06-27T13:00:00-07:00": 200,
             },
-            "wh_hours": {
+            "wh_period": {
                 "2021-06-27T13:00:00-07:00": 30,
                 "2022-06-27T13:00:00-07:00": 300,
             },
diff --git a/tests/components/forecast_solar/test_energy.py b/tests/components/forecast_solar/test_energy.py
index 9ab6038818b..3ca89d33faa 100644
--- a/tests/components/forecast_solar/test_energy.py
+++ b/tests/components/forecast_solar/test_energy.py
@@ -15,7 +15,7 @@ async def test_energy_solar_forecast(
     mock_forecast_solar: MagicMock,
 ) -> None:
     """Test the Forecast.Solar energy platform solar forecast."""
-    mock_forecast_solar.estimate.return_value.wh_hours = {
+    mock_forecast_solar.estimate.return_value.wh_period = {
         datetime(2021, 6, 27, 13, 0, tzinfo=timezone.utc): 12,
         datetime(2021, 6, 27, 14, 0, tzinfo=timezone.utc): 8,
     }