diff --git a/cosmotech/coal/store/output/channel_interface.py b/cosmotech/coal/store/output/channel_interface.py
index 53a86491..de57fb59 100644
--- a/cosmotech/coal/store/output/channel_interface.py
+++ b/cosmotech/coal/store/output/channel_interface.py
@@ -22,10 +22,12 @@ def delete(self) -> bool:
 
     def is_available(self) -> bool:
         try:
-            return all(
-                all(key in self.configuration[section] for key in self.required_keys[section])
-                for section in self.required_keys.keys()
-            )
+            for section in self.required_keys.keys():
+                for key in self.required_keys[section]:
+                    if key not in self.configuration[section]:
+                        # if key not in conf get global conf value else KeyError is raised
+                        self.configuration[section][key] = self.configuration.root[section][key]
+            return True
         except KeyError:
             return False
 
diff --git a/cosmotech/coal/utils/configuration.py b/cosmotech/coal/utils/configuration.py
index 1b0e98d6..55a6d400 100644
--- a/cosmotech/coal/utils/configuration.py
+++ b/cosmotech/coal/utils/configuration.py
@@ -28,6 +28,8 @@ def __getattr__(self, key):
             except (KeyError, AttributeError):
                 LOGGER.warning(f"dotdict Ref {_v} doesn't exist")
                 raise ReferenceKeyError(_v)
+        if isinstance(_v, str) and _v.startswith("env."):
+            return os.getenv(_v[4:])
         return _v
 
     __delattr__ = dict.__delitem__
diff --git a/tests/unit/coal/test_postgresql/test_postgresql_utils.py b/tests/unit/coal/test_postgresql/test_postgresql_utils.py
index 2c3eafc0..adb03444 100644
--- a/tests/unit/coal/test_postgresql/test_postgresql_utils.py
+++ b/tests/unit/coal/test_postgresql/test_postgresql_utils.py
@@ -110,7 +110,6 @@ def test_get_postgresql_table_schema_not_found(self, mock_connect, base_configur
         # Arrange
         target_table_name = "test_table"
         _psql = PostgresUtils(base_configuration)
-        print(base_configuration.postgres)
 
         # Mock connection and cursor
         mock_conn = MagicMock()
diff --git a/tests/unit/coal/test_store/test_output/test_channel_interface.py b/tests/unit/coal/test_store/test_output/test_channel_interface.py
index 241cd41f..db8ba679 100644
--- a/tests/unit/coal/test_store/test_output/test_channel_interface.py
+++ b/tests/unit/coal/test_store/test_output/test_channel_interface.py
@@ -69,9 +69,9 @@ def test_is_available_with_required_keys_present(self):
     def test_is_available_with_missing_keys(self):
         """Test is_available when required keys are missing."""
         # Arrange
-        channel = ChannelInterface()
+        configuration = {"section1": {"key1": "value1"}, "section2": {"key3": "value3"}}  # missing key2
+        channel = ChannelInterface(configuration)
         channel.required_keys = {"section1": ["key1", "key2"], "section2": ["key3"]}
-        channel.configuration = {"section1": {"key1": "value1"}, "section2": {"key3": "value3"}}  # missing key2
 
         # Act
         result = channel.is_available()
@@ -82,13 +82,12 @@ def test_is_available_with_missing_keys(self):
     def test_is_available_with_missing_section(self):
         """Test is_available when a required section is missing."""
         # Arrange
-        channel = ChannelInterface()
-        channel.required_keys = {"section1": ["key1", "key2"], "section2": ["key3"]}
-        channel.configuration = {
+        configuration = {
             "section1": {"key1": "value1", "key2": "value2"}
             # section2 is missing
         }
-
+        channel = ChannelInterface(configuration)
+        channel.required_keys = {"section1": ["key1", "key2"], "section2": ["key3"]}
         # Act & Assert
         # The is_available method will raise KeyError when section is missing
         # This is the actual behavior of the current implementation
diff --git a/tests/unit/coal/test_utils/conf.ini b/tests/unit/coal/test_utils/conf.ini
index 98a1225e..3d16230c 100644
--- a/tests/unit/coal/test_utils/conf.ini
+++ b/tests/unit/coal/test_utils/conf.ini
@@ -8,6 +8,9 @@ test = 1
 [section.sub]
 TEST = 2
 
+[bar]
+alors = 'env.faismoinlmalin'
+
 [secrets.section]
 secval = "sec"
 
diff --git a/tests/unit/coal/test_utils/test_utils_configuration.py b/tests/unit/coal/test_utils/test_utils_configuration.py
index 6668255e..0a038727 100644
--- a/tests/unit/coal/test_utils/test_utils_configuration.py
+++ b/tests/unit/coal/test_utils/test_utils_configuration.py
@@ -36,6 +36,14 @@ def test_no_config_file_with_env_var(self):
             c.secrets
         assert c.log_level == "test_value"
 
+    def test_config_file_with_env_var_prefix(self):
+        os.environ["CONFIG_FILE_PATH"] = os.path.abspath(os.path.join(os.path.dirname(__file__), "conf.ini"))
+        os.environ["faismoinlmalin"] = "la"
+
+        c = configuration.Configuration()
+
+        assert c.bar.alors == "la"
+
     def test_config_file_with_secrets(self):
         os.environ["CONFIG_FILE_PATH"] = os.path.abspath(os.path.join(os.path.dirname(__file__), "conf.ini"))
         os.environ["faismoinlmalin"] = "la"