Index: src/game/structures.js
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
--- src/game/structures.js	(revision 786c791e3cf1b1516d14bbf0157376d55a508179)
+++ src/game/structures.js	(revision )
@@ -1109,7 +1109,7 @@
             return C.ERR_NAME_EXISTS;
         }
 
-        let energyStructures = options.energyStructures && _.map(options.energyStructures, 'id');
+        let energyStructures = options.energyStructures && _.uniq(_.map(options.energyStructures, 'id'));
 
         if(!this.my) {
             return C.ERR_NOT_OWNER;
Index: src/processor/intents/spawns/_charge-energy.js
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
--- src/processor/intents/spawns/_charge-energy.js	(revision 786c791e3cf1b1516d14bbf0157376d55a508179)
+++ src/processor/intents/spawns/_charge-energy.js	(revision )
@@ -46,6 +46,8 @@
             (energyStructure.type === 'spawn' || energyStructure.type === 'extension');
     });
 
+    energyStructures = _.uniq(energyStructures);
+
     let availableEnergy = _.sum(energyStructures, id => roomObjects[id].energy);
     if(availableEnergy < cost) {
         return false;