diff --git a/hydra_pywr/exporter.py b/hydra_pywr/exporter.py
index 03a0807..5cf1230 100644
--- a/hydra_pywr/exporter.py
+++ b/hydra_pywr/exporter.py
@@ -695,7 +695,8 @@ def build_node_and_references(self, nodedata, pywr_node_type):
                 resource_attribute['name'] = f"__{nodedata['name']}__:{attribute_name}"
                 self.data.attributes.append(resource_attribute)
 
-        nodedata["type"] = pywr_node_type['name']
+        #Ensure the node type name is lower case, and has all spaces and non-characters removed.
+        nodedata["type"] = re.sub(r'[^a-zA-Z]', '', pywr_node_type['name']).lower()
         node_attr_data = {a:v for a,v in nodedata.items() if a not in self.exclude_hydra_attrs}
         position = {"geographic": [ nodedata.get("x",0), nodedata.get("y",0) ]}
         node_attr_data["position"] = position