diff --git a/BuildingSync.xsd b/BuildingSync.xsd
index 11a372cb..6bfcb0e8 100644
--- a/BuildingSync.xsd
+++ b/BuildingSync.xsd
@@ -8007,6 +8007,12 @@
                   </xs:simpleContent>
                 </xs:complexType>
               </xs:element>
+              <xs:element ref="auc:Capacity" minOccurs="0">
+                <xs:annotation>
+                  <xs:documentation>Capacity of the system.</xs:documentation>
+                </xs:annotation>
+              </xs:element>
+              <xs:element ref="auc:CapacityUnits" minOccurs="0"/>
             </xs:sequence>
           </xs:complexType>
         </xs:element>
@@ -8136,6 +8142,12 @@
                   </xs:simpleContent>
                 </xs:complexType>
               </xs:element>
+              <xs:element ref="auc:Capacity" minOccurs="0">
+                <xs:annotation>
+                  <xs:documentation>Capacity of the system.</xs:documentation>
+                </xs:annotation>
+              </xs:element>
+              <xs:element ref="auc:CapacityUnits" minOccurs="0"/>
             </xs:sequence>
           </xs:complexType>
         </xs:element>
@@ -8233,6 +8245,12 @@
                   </xs:simpleContent>
                 </xs:complexType>
               </xs:element>
+              <xs:element ref="auc:Capacity" minOccurs="0">
+                <xs:annotation>
+                  <xs:documentation>Capacity of the system.</xs:documentation>
+                </xs:annotation>
+              </xs:element>
+              <xs:element ref="auc:CapacityUnits" minOccurs="0"/>
             </xs:sequence>
           </xs:complexType>
         </xs:element>
@@ -8251,6 +8269,12 @@
                   </xs:simpleContent>
                 </xs:complexType>
               </xs:element>
+              <xs:element ref="auc:Capacity" minOccurs="0">
+                <xs:annotation>
+                  <xs:documentation>Capacity of the system.</xs:documentation>
+                </xs:annotation>
+              </xs:element>
+              <xs:element ref="auc:CapacityUnits" minOccurs="0"/>
             </xs:sequence>
           </xs:complexType>
         </xs:element>